Faculty Profiles - ABE HAYATO

Information

写真a

ABE HAYATO

Organization

Faculty of Agriculture Department of Agro-environmental Sciences(University Forest) Assistant Professor

Contact information

Homepage

https://linktr.ee/HayatoAbe
Link portal
https://sites.google.com/site/abehayatobio/home
Personal website
https://researchmap.jp/hayato_abe
Research map

External link

Research Areas

Natural Science / Human geosciences
Life Science / Forest science

Degree

Ph. D. (Agriculture) （ 2025.3 Kyushu University ）

Research History

Kyushu University Faculty of Agriculture Assistant Professor

2025.4 - Present

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Country：Japan

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Japan Society for the Promotion of Science Research Fellowship for Young Scientists DC1

2022.4 - Present

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Country：Japan

Notes：令和6年度：研究奨励金特別手当を受給

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財団法人本庄国際奨学財団奨学生（大学院）

2020.4 - 2022.3

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Country：Japan

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公益財団法人樫山奨学金財団奨学生（学部）

2016.4 - 2020.4

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Country：Japan

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Education

Kyushu University Graduate School of Bioresource and Bioenvironmental Sciences 環境農学専攻

2020.4 - 2025.3

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Country：Japan

Notes：流域環境制御学分野（農学部附属演習林）

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University of the Ryukyus Faculty of Agriculture Department of Subtropical Agro-Environmental Sciences

2016.4 - 2020.3

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Country：Japan

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Research Interests・Research Keywords

Research theme：シカ

Keyword：シカ

Research period： 2025
Research theme：台風

Keyword：台風

Research period： 2025
Research theme：土壌侵食

Keyword：土壌侵食

Research period： 2025
Research theme：景観生態学

Keyword：景観生態学

Research period： 2025
Research theme：森林水文学

Keyword：森林水文学

Research period： 2025
Research theme： Forest Ecology

Keyword： Forest Ecology

Research period： 2025
Research theme：炭素循環

Keyword：炭素循環

Research period： 2025
Research theme：生態系生態学

Keyword：生態系生態学

Research period： 2025
Research theme：生物地球科学

Keyword：生物地球科学

Research period： 2025
Research theme： Production Ecology

Keyword： Production Ecology

Research period： 2025

Awards

生物資源環境科学府賞（博士後期課程）

2025.3 九州大学

阿部隼人

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Country：Japan

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日本森林学会学生奨励賞

2025.3 日本森林学会 Soil erosion under forest hampers beech growth: Impacts of understory vegetation degradation by sika deer

阿部隼人

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Award type：Award from Japanese society, conference, symposium, etc.

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九州大学学生表彰（博士後期課程，学術研究活動）

2025.3 九州大学

阿部隼人

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Country：Japan

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いいね！賞（ポスター）

2025.3 日本生態学会

阿部隼人, 付東川, 久米朋宣, 片山歩美

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Student Poster Award

2024.4 The Japanese Forest Society Comparison of stem growth of mature beech trees inside and outside of deer exclusion fences

Hayato ABE, Donchuan FU, Tadamichi SATO, Yuji TOKUMOTO, Yuki SAKURAI, Fujio HYODO, Ayumi KATAYAMA

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Award type：Award from Japanese society, conference, symposium, etc. Country：Japan

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Best poster award

2023.9 学術変革領域Aデジタルバイオスフェア：地球環境を守るための統合生物圏科学長期的なシカの植生採食が樹木成長と森林の炭素蓄積量に与える影響

Hayato Abe

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Award type：Award from Japanese society, conference, symposium, etc. Country：Japan

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特に優れた業績による奨学金返還免除 (第一種奨学金全額免除)

2022.3 日本学生支援機構

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Award type：Award from publisher, newspaper, foundation, etc. Country：Japan

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Papers

Impact of Sustained Virological Response on Long-Term Outcomes After Curative Resection in Patients with Hepatitis C Virus-Related Hepatocellular Carcinoma in the Era of Direct-Acting Antiviral Therapy

Abe, H; Okamura, Y; Yoshida, N; Mitsuka, Y; Aramaki, O; Moriguchi, M; Nakamura, M; Kogure, H; Okada, M; Ohni, S; Masuda, S

ANNALS OF SURGICAL ONCOLOGY 32 ( 2 ) 1093 - 1104 2025.2 （ ISSN:1068-9265 eISSN:1534-4681 ）

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DOI： 10.1245/s10434-024-16453-9

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Diet composition of sika deer in Kasuya Research Forest of Kyushu University in northern Kyushu, Japan Reviewed

Takatsuki Seiki, Abe Hayato, Katayama Ayumi

Honyurui Kagaku (Mammalian Science) 65 ( 1 ) 1 - 8 2025 （ ISSN:0385437X eISSN:1881526X ）

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Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Mammal Society of Japan

We analyzed the diets of sika deer from Kyushu University’s Kasuya Research Forest based on point-frame fecal surveys conducted between February 2023 and January 2024. Leaves, mainly from evergreen species, accounted for 42.1% of the fecal contents in February, with the remainder comprising fiber and culms. In April, the leaf component decreased, whereas the fiber component increased to 45.8%. In August, grass leaves comprised only 11.2%, and culms increased to 56.5%, suggesting that deer ventured out of the forest to feed on grasses. In October, the leaf component decreased further, while culms decreased to 12.0% and the fiber content again increased to 39.0%. Acorns of Castanopsis cuspidata and seeds of pokeweed (Phytolacca decandra) seeds were recovered from fecal samples in October. In January, the leaf component decreased to 16.8% and the proportion of unidentifiable materials increased to 35.1%. The deer population in our study area increased rapidly over several years around 2010, profoundly affecting the local vegetation. The small occupation of green leaves in the deer diets (23–33%), even during the plant growth season, reflected the vegetation deterioration caused by the increase in deer.

File：九州北部の低山地におけるニホンジカの食性.pdf

DOI： 10.11238/mammalianscience.65.1

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Protection of understory vegetation by deer exclosure fences prevent the reduction of beech growth due to soil erosion Reviewed

Hayato Abe, Dongchuan Fu, Tadamichi Sato, Yuji Tokumoto, Fujio Hyodo, Ayumi Katayama

Journal of Environmental Management 371 123146 2024.12 （ ISSN:0301-4797 eISSN:1095-8630 ）

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Language：English Publishing type：Research paper (scientific journal) Publisher：Journal of Environmental Management

Overbrowsing by ungulates has degraded understory vegetation in worldwide forests. Understory degradation causes soil erosion and environmental degradation, causing mature tree decline. Although ungulate exclosure fences are installed to protect vegetation, their effectiveness in preventing tree decline associated with soil degradation remains unclear. We aimed to fill this gap on slopes of Mt. Shiraga, Japan, where sika deer have overbrowsed for >20 years. Tree-ring records in 1960–2022 for eight beeches per each of inside and outside fences were analyzed to compare stem basal area increment (BAI, cm−2 yr−1) and trend change timings for BAI (i.e., break-point). Soil properties, exposed root height (ERH) as cumulative soil erosion index, and intrinsic water use efficiency (iWUE) as water limitation proxy were also compared. Compared with areas inside fences, areas outside fences had no understory vegetation, higher ERH, and higher soil hardness and moisture. BAI outside fences turned their growth trend from positive to negative since 2004, but not inside fences. Break-point of BAI outside fences matched the understory degradation period in the field. The long-term BAI trend (i.e., regression slope of BAI) after the break-point was negatively related to ERH but not to soil properties (e.g., soil hardness and moisture). Furthermore, BAI outside fences was negatively related to iWUE after the break-point, whereas BAI inside fences was not. These results indicate that the maintenance of understory by fencing prevents overbrowsing-associated mature tree decline through mitigating root exposure and related water limitation, despite the potential of water competition with understory.

File： Abe2024_JEMA_ShiragaSRG_TreeRing.pdf

DOI： 10.1016/j.jenvman.2024.123146

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Effects of deer-exclusion fences on soil microbial communities through understory environmental changes in a cool temperate deciduous forest in Southern Japan Reviewed

Yuji Tokumoto, Yuki Sakurai, Hayato Abe, Ayumi Katayama

Forest Ecology and Management 564 121993 - 121993 2024.7 （ ISSN:0378-1127 eISSN:1872-7042 ）

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Language：English Publishing type：Research paper (scientific journal) Publisher：Forest Ecology and Management

The increasing deer population has significantly altered the forest ecosystems. Deer browsing affects not only plant species diversity and composition but also other organisms indirectly, along with soil properties. However, the effects of deer grazing on the soil microbial community and the underlying mechanisms have not been well understood. To assess these effects, we compared the understory environment and soil microbial community inside and outside fences at Mt. Shiraga, where severe soil environmental degradation has occurred due to sika deer grazing. We selected 20 Fagus trees inhabiting areas within and outside the fences with similar topological features. Eleven environmental variables and both soil prokaryotic and fungal communities were compared between samples inside and outside the fences. The area inside the fence had significantly higher dwarf bamboo density and soil carbon (C) and nitrogen (N) content, whereas soils outside the fences had higher pH and bulk density. The diversity index of the fungal community, in terms of the number of amplicon sequence variants, inside the fence was higher than that outside, whereas that of the prokaryotic community did not differ between fences. Both prokaryotic and fungal communities differed between inside and outside fences. The prokaryotic community changed with the soil C/N ratio, and the relative abundance of oligotrophic bacteria increased with decreasing soil C/N ratio. The fungal community also changed with soil pH and dwarf bamboo density, with the relative abundances of symbiotrophic fungi and ectomycorrhizae increasing with increasing soil pH. Comparative analyses between inside and outside fence samples might provide information on soil microbial community changes with the changes in soil properties after deer grazing.

File： 1-s2.0-S0378112724003050-main (1).pdf

DOI： 10.1016/j.foreco.2024.121993

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Reduction in forest carbon stocks by sika deer-induced stand structural alterations Reviewed

Hayato Abe, Tomonori Kume, Ayumi Katayama

Forest Ecology and Management 562 121938 2024.6 （ ISSN:0378-1127 eISSN:1872-7042 ）

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Language：English Publishing type：Research paper (scientific journal) Publisher：Forest Ecology and Management

Ununiform, excessive, and prolonged understory vegetation feeding by overpopulated ungulates (over-browsing) leads to heterogeneous stand structural alterations at the landscape level. However, it is not yet clear how changes in various types of stand structural alterations affect total carbon (C) stocks in forest ecosystems as the sum of aboveground C stocks (AGC) and belowground C stocks (BGC). We aimed to fill this gap in a cool temperate broadleaf–conifer mixed forest in southern Kyushu, Japan, where over-browsing of sika deer has occurred since 1980. Four replicate survey plots were established in four stand types, namely, stands with presence of understory vegetation (PU), stands with no understory vegetation (NU), stands dominated by unpalatable shrubs (SR), and stands with canopy gap areas with a lack of regeneration (CG). Using PU as a baseline, alterations in stand structure (e.g., stem density) and C stocks were evaluated for each stand type. We measured C stocks of overstory trees (height > 2 m), understory vegetation, leaf litter, fine woody debris (FWD), and coarse woody debris (CWD) as AGC. C stocks of fine roots, coarse roots, and soil organic matter (SOM) at 0–30 cm depths were measured as BGC. We also separated overstory trees according to the palatability of the deer diet. The alteration from PU to NU did not reduce AGC, BGC, or total C stocks. The alteration from PU to SR and CG was found to potentially reduce total C stocks and AGC by up to 49% and 59%, respectively. These reductions in SR and CG were mainly driven by the decreased C stock of palatable overstory trees. There were dense unpalatable shrubs in SR and large amounts of CWD in CG. However, neither was sufficient to offset the loss of palatable overstory trees in SR and CG. We also found a reduction in the C stock of leaf litter and SOM at 0–10 cm depth in NU, SR, and CG. These reductions were likely caused by reduced litterfall and increased soil erosion, implying future reductions in BGC. Our results suggest that stand structure conservation is a key guideline for C stock retention when implementing forest management strategies to prevent over-browsing. The failure to conserve palatable juvenile trees could lead to a lack of more palatable overstory trees in the future, causing irreversible changes in AGC and BGC.

File： 1-s2.0-S0378112724002500-main (1).pdf

DOI： 10.1016/j.foreco.2024.121938

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Soil erosion under forest hampers beech growth: Impacts of understory vegetation degradation by sika deer Reviewed

Hayato Abe, Tomonori Kume, Fujio Hyodo, Mimori Oyamada, Ayumi Katayama

CATENA 234 2024.1 （ ISSN:0341-8162 eISSN:1872-6887 ）

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Language：English Publishing type：Research paper (scientific journal) Publisher：Catena

The overpopulation of large herbivorous mammals degrades understory vegetation and hence promotes soil erosion in some northern hemisphere forests. Topsoil removal via erosion reduces soil water and nitrogen (N) content as well as exposes tree roots. However, whether topsoil removal inhibits tree growth through water and N uptake limitations has not been examined. This study aimed to measure the vertical length from exposed roots surface to the soil surface (exposed root height; ERH) under degraded forest understory vegetation and to evaluate its influence on tree growth. Specifically, we examined the relationships between ERH and beech growth and identified the timing of growth reduction based on annual tree-ring analysis at the individual scale. Furthermore, we discussed the effects of water and N limitations on beech growth reduction. We studied 12 Japanese beech trees on Mt. Sanpo, southern Kyushu Island, Japan, where understory vegetation was degraded and lost due to herbivory by Japanese sika deer from 1980 to 2003. Lower amounts of leaf production and relative growth rates of stem basal area increment (BAI) were observed in beech trees with higher ERH. Segmented regression analysis, which detects the changing time of a temporal trend (i.e., break-point), revealed that the BAI has resulted in a decreasing trend after 1997.6 ± 9.0 (yr), which coincided with the field observations on understory degradation in the study site. After the break-point of the BAI, the BAI of each study tree was negatively related to intrinsic water use efficiency, an integrated index of water limitation. These results suggest that soil erosion after the degradation of understory vegetation reduced beech growth, possibly because of the water limitations associated with root exposure. Reduced beech growth will reduce the supply of the litter layer that prevents topsoil erosion, which may enhance further soil erosion and tree growth reduction.

DOI： 10.1016/j.catena.2023.107559

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Soil erosion decreases soil microbial respiration in Japanese beech forests with understory vegetation lost by deer Reviewed

Ayumi Katayama, Mimori Oyamada, Hayato Abe, Kazushige Uemori, Takuo Hishi

Journal of Forest Research 28 ( 6 ) 428 - 435 2023.11 （ ISSN:1341-6979 eISSN:1610-7403 ）

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Language：English Publishing type：Research paper (scientific journal) Publisher：Informa UK Limited

Increases in the number of wild herbivores resulted in understory degradation because of their overgrazing in forest ecosystems. Deer overgrazing has occurred soil erosion in Japanese beech forests where dwarf bamboo used to be densely covered. Soil erosion can result in a decrease in soil carbon and nutrient contents, causing the soil microbial respiration in such forest ecosystems to be degraded. The objective of this study was to clarify the effects of soil erosion, which sporadically occurs within the forests, on soil properties and microbial activity. Soil erosion indices, such as the maximum height of exposed roots from the soil surface (MAXH), tree and soil properties, microbial basal and substrate-induced respiration, were measured under the canopy of 16 beech trees in each of three deciduous broadleaved forests on southern Kyushu Island, Japan. Soil properties such as the humus mass and the organic matter contents of soil and humus decreased with MAXH. Basal and substrate-induced respiration decreased with increases in MAXH. Soil properties associated with organic matter increased with basal and substrate-induced respiration. These results suggest that soil surface layers that were rich in organic matter ran off because of soil erosion, resulting in the degradation of soil microbial activity. This study suggests that increases in wild herbivore populations degrade soil ecosystem functioning owing to the soil erosion induced by understory disappearance.

DOI： 10.1080/13416979.2023.2235499

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Differences in understory environment and soil microbiome between inside and outside deer fences in Kyushu

Sakurai Yuki, Katayama Ayumi, Abe Hayato, Tsuyama Taku, Tokumoto Yuji

The Japanese Forest Society Congress 134 ( 0 ) 660 2023.5

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Language：English Publisher：The Japanese Forest Society

[in Japanese]

DOI： 10.11519/jfsc.134.0_660

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Differences in aboveground and belowground carbon stocks among altered forest structures induced by deer overgrazing

ABE HAYATO, Kume Tomonori, Katayama Ayumi

The Japanese Forest Society Congress 134 ( 0 ) 496 2023.5

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Language：English Publisher：The Japanese Forest Society

[in Japanese]

DOI： 10.11519/jfsc.134.0_496

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Carbon stocks in cool temperate forests with different stand structure due to deer overgrazing

2023.5

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DOI： 10.5194/egusphere-egu23-10546
Soil respiration and its components in response to abiotic factors in Phyllostachys Bamboo forests

American Geophysical Union (AGU) Fall Meeting 2022 2022.12
Effects of differences in aboveground dead organic matter types on the stand‐scale necromass and CO2 efflux estimates in a subtropical forest in Okinawa Island, Japan Reviewed International journal

Hayato Abe, Ayumi Katayama, Shingo Taniguchi, Atsushi Takashima, Tomonori Kume, Kazuho Matsumoto

Ecological Research 37 ( 5 ) 609 - 622 2022.9 （ ISSN:0912-3814 eISSN:1440-1703 ）

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Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley

Dead organic matter (DOM), which consists of leaf litter, fine woody debris (FWD; <3 cm diameter), downed coarse woody debris (CWDlog), and standing or suspended coarse woody debris (CWDsnag), contributes to forest carbon cycling; however, few studies have considered effects of differences in DOM types on the stand-scale estimates of carbon stocks of necromass and CO2 efflux (Rstand). This study investigated characteristics of necromass and Rstand in a subtropical forest in Okinawa Island, Japan, to quantify the effect of DOM type on total necromass, total Rstand, and estimate error of total necromass and Rstand. The CWDsnag accounted for the highest proportion (54%) of total necromass (1499.7 g C m−2), followed by CWDlog (24%), FWD (11%), and leaf litter (11%). Leaf litter accounted for the highest proportion (37%) of total Rstand (340.6 g C m−2 year−1), followed by CWDsnag (25%), CWDlog (20%), and FWD (17%). The CWDsnag was distributed locally with 173% coefficient of variation for necromass, which was twofold higher than those of leaf litter and FWD (72%–73%). The potential error in CWD accounted for 99% and 79% estimate error for total necromass and Rstand, respectively. For the estimates of CWDsnag and CWDlog necromass with the estimates error of <10% in this study area, sampling areas of ≥28,750 m2 and ≥2058–42,875 m2, respectively, were required. Our results showed that CWD considerably contributed to stand-scale carbon stocks and efflux among aboveground DOM in this forest, resulting in a major source of errors in the stand-scale estimates.

DOI： 10.1111/1440-1703.12317

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Other Link： https://onlinelibrary.wiley.com/doi/full-xml/10.1111/1440-1703.12317
Root dynamics in a Moso bamboo forest using the optical scanner method

Matsumoto Tatsuya, Kume Tomonori, Abe Hayato, Ktayama Ayumi

The Japanese Forest Society Congress 133 ( 0 ) 520 2022.5

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Language：English Publisher：The Japanese Forest Society

[in Japanese]

DOI： 10.11519/jfsc.133.0_520

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Effects of differences in aboveground dead organic matter types on the stand-scale necromass and CO efflux estimates in a subtropical forest in Okinawa Island, Japan

2022.5

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DOI： 10.1002/essoar.10509588.2
Exposure of tree roots and its control factors in a mixed temperate forest with no understory vegetation Reviewed

Abe Hayato, Fu Dongchuan, Kume Tomonori, Katayama Ayumi

Bull. Kyushu Univ. For 103 13 - 20 2022.3 （ ISSN:04530284 ）

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Language：Japanese Publishing type：Research paper (bulletin of university, research institution) Publisher：The Kyushu University Forests

Since around 1980, soil erosion has been progressing due to the reduction of the understory vegetation caused by the overpopulation of Sika deer (Cervus nippon) in the Shiiba Research Forest, Kyushu University. The exposed tree roots can be used as an index of soil erosion. This study aims to evaluate the characteristics of the exposed roots and clarify the factors relating to the exposed root in the Siiba Research Forest. We investigated the vertical height from the soil surface to exposed roots (exposed root height) of Tsuga sieboldii, Quercus salicina, Quercus crispula, Fagus crenata, and Magnolia obovata. We evaluated the relationship between exposed root height and tree size, slope angle, and litter amount on the forest floor. Exposed roots tended to appear downslope of the study trees. The maximum exposed root height of all tree species was 17.1±6.5cm. Regardless of tree species, the maximum exposed root height was positively correlated with tree height (Pearson correlation coefficient: r=0.35, p= 0.07) and negatively correlated with litter amount (r=－0.35, p= 0.07). These results suggested that extent of soil erosion around trees and among trees were spatially heterogeneous, especially strong in around trees with high tree height and low litter amount on the forest floor.

File： 103_p013.pdf

DOI： 10.15017/4776829

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Other Link： https://agriknowledge.affrc.go.jp/RN/2030941519
Carbon and nitrogen storage of dead woody debris in an abandoned Moso bamboo forest Reviewed

Kohei Shimono, Ayumi Katayama, Hayato Abe, Tsutomu Enoki

Carbon and nitrogen storage of dead woody debris in an abandoned Moso bamboo forest 102 9 - 14 2021.3 （ ISSN:0453-0284 ）

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Language：Japanese Publishing type：Research paper (bulletin of university, research institution) Publisher：Bull. Kyushu Univ. For

Although it is reported that comparable carbon and nitrogen is stored in abandoned bamboo forests with neighboring broadleaved forest and Japanese cedar forests, coarse woody debris has not been considered in the estimate in bamboo forests. This study was aimed to understand contribution of woody debris on carbon and nitrogen storage in an abandoned Moso bamboo forest. For this aim, we examined carbon and nitrogen storage in woody debris (standing and downed culms), soil organic matter (litter layer and mineral soil) and aboveground and belowground biomass of bamboo. This study was conducted in Kasuya research forest of Kyushu\ University. Three study plots were established along a slope to consider spatial variation in woody debris. Carbon storage in standing and downed culms, litter layer and mineral soil were 11.2,13.8,2.7 and 17.1 Mg C ha-1, respectively. Woody debris accounted for 30.9 % of aboveground biomass of bamboo. Culm density of standing dead culms was 18 % of living culm density. Nitrogen storage in standing and downed culms, litter layer and mineral soil were 49.1,136.4,85.8 and 1468.2 kg N ha-1, respectively. Woody debris accounted for 56 % of aboveground biomass of bamboo. These results suggest that woody debris can affect carbon and nitrogen storage considerably, and therefore it is very important to evaluate the storage in the dead culms in an abandoned Moso bamboo forest.

File： 102_p009.pdf

DOI： 10.15017/4377826

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Presentations

Stand structural alterations by browsing of sika deer degrade forest carbon stocks stocks International coauthorship International conference

Hayato ABE, Tomonori KUME, Ayumi KATAYAMA

EcoSummit2024 2024.12 Elsevier Ltd

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Event date： 2024.12

Language：English Presentation type：Poster presentation

Venue：Zhengzhou Country：China

File： Ecosummit_Abe.pdf

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Forest nitrogen cycling influenced by deer browsing in cool-temperature mountain forests: A stand-scale based analysis across four stand structures International coauthorship International conference

Dongchuan FU, Hayato ABE, Zhouqiang LI, Ayumi KATAYAMA, Karibu FUKUZAWA, Takuo HISHI, Masaaki CHIWA

EcoSummit2024 2024.12 Elsevier Ltd

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Event date： 2024.12

Language：English Presentation type：Poster presentation

Venue：Zhengzhou Country：China

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Effects of Sasa understory degradation by deer grazing on N cycling in cool temperate forests in western Japan

Dongchuan Fu, Hayato Abe, Zhouqiang Li, Ayumi Katayama, Karibu Fukuzawa, Takuo Hishi, Masaaki Chiwa

Japan Geoscience Union (JpGU) Meeting 2024 2024.5

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Event date： 2024.5

Language：English Presentation type：Poster presentation

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Net ecosystem carbon balance reduced by sika deer-induced stand structure alternations in cool-temperate forests

Hayato ABE, Dongchuan Fu, Tomonori Kume, Ayumi Katayama

Japan Geoscience Union (JpGU) Meeting 2024 2024.5

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Event date： 2024.5

Language：English Presentation type：Poster presentation

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Differences in understory environment and soil microbiome between inside and outside deer fences in Kyushu

Sakurai Yuki, Katayama Ayumi, Abe Hayato, Tsuyama Taku, Tokumoto Yuji

The Japanese Forest Society Congress 2023.5 THE JAPANESE FORESTRY SOCIETY

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Event date： 2023.5

Language：English

[in Japanese]

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Differences in aboveground and belowground carbon stocks among altered forest structures induced by deer overgrazing

ABE HAYATO, Kume Tomonori, Katayama Ayumi

The Japanese Forest Society Congress 2023.5 THE JAPANESE FORESTRY SOCIETY

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Event date： 2023.5

Language：Japanese Presentation type：Poster presentation

[in Japanese]

File：森林学会v3B_230310.pdf

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Root dynamics in a Moso bamboo forest using the optical scanner method

Matsumoto Tatsuya, Kume Tomonori, Abe Hayato, Ktayama Ayumi

The Japanese Forest Society Congress 2022.5 THE JAPANESE FORESTRY SOCIETY

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Event date： 2022.5

Language：English

[in Japanese]

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Can two abandoned Phyllostachys stands be carbon sources?

Si-Ho HAN, Tomonori Kume, Hayato ABE, Dongchuan FU, Orrego MARLY

日本森林学会大会 2025.3

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Language：English Presentation type：Oral presentation (general)

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Carbon stocks in cool temperate forests with different stand structure due to deer overgrazing International conference

Hayato Abe, Tomonori Kume, Ayumi Katayama

European Geophysical Union (EGU) General assembly 2023 2023.4

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Language：English Presentation type：Poster presentation

Venue：Vienna

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Effects of differences in aboveground dead organic matter types on the stand-scale carbon dynamics in a subtropical forest in Okinawa Island, Japan

Hayato Abe; Ayumi Katayama; Shingo Taniguchi; Atsushi Takashima; Tomonori Kume; Kazuho Matsumoto

iLEAPS-Japan 研究集会 2021 ⼤気−陸⾯プロセスの研究の進展：観測とモデルによる統合的理解 2021.12 iLEAPS-Japan

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Language：Japanese Presentation type：Oral presentation (general)

Venue：JPN

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Effects of differences in aboveground dead organic matter types on the stand-scale necromass and CO2 efflux estimates in a subtropical forest in Okinawa Island, Japan International conference

Hayato Abe, Ayumi Katayama, Shingo Taniguchi, Atsushi Takashima, Tomonori Kume, Kazuho Matsumoto

American Geophysical Union (AGU) Fall Meeting 2021 2021.12

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Language：English Presentation type：Poster presentation

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Soil carbon dynamics in two Phyllostachys stands: abandoned bamboo stands still can be carbon sinks?

Tomonori Kume, Larisa Ozdemir, Hayato ABE, Ayumi Katayama

日本森林学会大会 2024.3

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Language：English Presentation type：Poster presentation

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Soil respiration and its components in response to abiotic factors in Phyllostachys Bamboo forests International conference

Larisa Ozdemir, Tomonori Kume, Ayumi Katayama, Hayato Abe, Orrego Morales

American Geophysical Union (AGU) Fall Meeting 2022 2022.12

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シカ排除によるブナ成長・土壌微生物群集・土壌機能の応答：熊本県白髪岳の事例 Invited

阿部隼人, 徳本雄史, 古賀みこと, 兵藤不二夫, 菱拓雄, 佐藤忠道, 付東川, 片山歩美

日本生態学会大会 2025.3

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Language：Japanese Presentation type：Oral presentation (invited, special)

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シカ排除柵の内外におけるブナ成木の肥大成長量の比較

阿部隼人, 付東川, 佐藤忠道, 徳本雄史, 櫻井優樹, 兵藤不二夫, 片山歩美

日本森林学会大会 2024.3

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Language：Japanese

File：森林学会2024ポスターv2.pdf

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シカ採食に伴う森林構造の変化による炭素固定機能の低下

阿部隼人, 付東川, 久米朋宣, 片山歩美

日本生態学会大会 2025.3

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スキャナー法によるモウソウチク林の根系動態の解析と撮影地点数の影響評価

遠藤いず貴, 松本達也, 井手淳一郎, 阿部隼人, 片山歩美, 久米朋宣

日本森林学会大会 2025.3

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スキャナー法を用いたモウソウチク林の根系動態

松本達也;久米朋宣;阿部隼人;片山歩美

第132回日本森林学会大会 2021.3

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Venue：JPN

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モウソウチク林の根系動態にスキャナー法での撮影地点数が与える影響評価

遠藤いず貴, 松本達也, 井手淳一郎, 阿部隼人, 片山歩美, 久米朋宣

日本森林学会 2024.3

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九州南部のブナの衰退と土壌侵食との関係性

阿部隼人, 小山田未森, 久米朋宣, 兵藤不二夫, 片山歩美

第69回日本生態学会大会 2022.3 日本生態学会

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Language：Japanese Presentation type：Poster presentation

Venue：JPN

File：生態学会ポスター_v4-5.pdf

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九州南部のブナ衰退とその要因としての土壌侵食の検討

阿部隼人, 小山田未森, 久米朋宣, 片山歩美

第77回九州森林学会 2022.12 九州森林学会

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Language：Japanese Presentation type：Poster presentation

Venue：JPN

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九州山地のブナ林における土壌侵食による葉の生理学的特性への影響

東若菜, 小切壮仁, 杉本廉, 櫻井優樹, 徳本雄史, 阿部隼人, 久米朋宣, 片山歩美

日本森林学会大会 2024.3

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Food habits of sika deer in Kyushu

Seiki TAKATSUKI, Ayumi KATAYAMA, Hayato ABE

日本生態学会大会 2025.3

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Language：Japanese Presentation type：Oral presentation (general)

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Estimation of fine root production by the ingrowth core method in forests across Japan

Mone HIRATA, Hayato ABE, Mimori OYAMADA, Ayumi KATAYAMA

ESJ71 2024.3

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冷温帯林におけるミヤコザサ除去が根のバイオマスと形態形質に及ぼす影響

付東川, 李周強, 阿部隼人, 菱拓雄, 福澤加里部, 智和正明

日本森林学会大会 2024.3

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Language：Japanese

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南アルプス森林限界の水源環境調査

渡辺信, 阿部隼人, 津田吉晃, 梅川元一

日本生態学会大会 2025.3

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Language：Japanese Presentation type：Oral presentation (general)

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土壌侵食が森林土壌の生態系機能に与える影響

小山田未森;阿部隼人;菱拓雄;片山歩美

第69回日本生態学会大会 2021.3

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Venue：JPN

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日本森林学会学生奨励賞受賞講演–Soil erosion under forest hampers beech growth: Impacts of understory vegetation degradation by sika deer(森林で生じる土壌侵食はブナの成長を妨げる：ニホンジカによる下層植生劣化の影響) Invited

阿部隼人

日本森林学会大会 2025.3

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Language：Japanese Presentation type：Oral presentation (invited, special)

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根系露出によるブナ地上部生理機能の変化

谷川晴宣, 古賀みこと, 阿部隼人, 高橋あかり, 末吉功季, 片山歩美, 東若菜

日本生態学会大会 2025.3

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沖縄島北部の亜熱帯常緑広葉樹林における地上部枯死有機物の動態

阿部隼人;松本一穂;谷口慎吾

第131回日本森林学会大会 2020.3 日本森林学会

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Language：Japanese Presentation type：Poster presentation

Venue：JPN

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里山のスギ林、広葉樹林、モウソウチク林での土壌呼吸量とその成分の違い

長井孝祐, Han Si-Ho, 阿部隼人, 久米朋宜

日本森林学会大会 2025.3

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長期的なシカの植生採食が樹木成長と森林の炭素蓄積量に与える影響

阿部隼人, 久米朋宣, 兵藤不二夫, 片山歩美

デジタルバイオスフェア全体会合2023 2023.9

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MISC

Sensitivities of soil respiration and heterotrophic respiration to temperature in a cool-temperate forest with sika deer-induced understory vegetation alteration

Hayato Abe, Tomonori Kume, Ayumi Katayama

EarthArXiv 2024.8

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Authorship：Lead author,　Corresponding author Language：English Publishing type：Internal/External technical report, pre-print, etc.

<jats:p>Overpopulated ungulates reduce the biomass of understory vegetation and promote the expansion of unpalatable plants in world forests. These understory degradations possibly influence sensitivities of soil respiration (Rs) and heterotrophic respiration (Rh) to temperature and moisture. Here, we examined this possibility in a cool-temperate forest in southern Kyushu, Japan. At the study site, the dominant understory vegetation, dwarf bamboo (Sasa; Sasamorpha borealis), has been lost and replaced by an unpalatable shrub, Asebi (Pieris japonica), owing to sika deer feeding. We targeted three understory vegetation types, namely, Sasa understory (SU), no understory (NU), and Asebi understory (AU). The Rs, Rh, soil temperature, and soil volumetric water content (SVWC) were measured at three points in each understory type using an automatic opening/closing chamber system from August 2022 to November 2023. We also evaluated understory conditions such as surface litter amount, fine root biomass, and soil physio-chemical properties to explore factors influencing the temperature sensitivity proxy (Q10) of Rs and Rh. The temporal variation of Rs and Rh was affected strongly by soil temperature and weakly by SVWC for all understory types. Differences in Q10 among SU, NU, and AU were comparable to the differences in Q10 among measurement points within the same understory type. Spatial variation in Q10 of Rs and Rh was explained by fine root biomass and surface litter amount, respectively. There were no differences in fine root biomass and surface litter amount among understory types. The lack of difference in surface litter amount can be explained by the minimal litter runoff associated with the alteration from SU to NU and AU due to the flat topography. Our findings indicate that understory loss and species replacement caused by deer do not affect the sensitivity of Rs or Rh at our site, which is characterized by flat topography.</jats:p>

File： Preprint_EarthArXiv.pdf

DOI： 10.31223/x5kh64

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Professional Memberships

The Japanese Society of Forest Environment

2025.4 - Present

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International Society for Mangrove Ecosystems

2025.4 - Present

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Japanese Society of Pedology

2025.4 - Present

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Japan Society for Mangroves

2025.4 - Present

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The Japanese Society of Soil Zoology

2025.3 - Present

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日本熱帯生態学会

2024.4 - Present

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Japan Geoscience Union

2024.1

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The Society of Agricultural Meteorology of Japan

2023.4 - Present

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The European Geosciences Union

2023.3 - 2024.3

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The American Geophysical Union

2021.9 - 2022.9

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The Ecological Society of Japan

2021.3 - Present

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The Japanese Forest Society

2020.3 - Present

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Academic Activities

Journal of Forest Research

Role(s)： Peer review

2024.8

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Type：Peer review

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Ecological Solutions and Evidence

Role(s)： Peer review

2024.1

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Type：Peer review

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Research Projects

Effects of deer-induced vegetation structure change on carbon holding capacity, Southern Kyushu, Japan

Grant number：22KJ2456 2023.3 - 2025.3

Grants-in-Aid for Scientific Research Grant-in-Aid for JSPS Fellows

阿部隼人

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Grant type：Scientific research funding

日本の森林では増えすぎたシカによる過度な植生採食が生じている。これに伴い、下層植生の消失、裸地化、シカ不嗜好性植物の優占など、森林の植生構造はこれまでにない変化が起きている。これはまた、土壌侵食を発生させる懸念がある。従ってシカの過度な植生採食は森林劣化に繋がると考えられるが、実態は不明である。そこで本研究は、森林の炭素固定機能の観点から森林において生じた過食に伴う森林劣化量を明らかにすることを目的に行う。このために、下層植生の有る針広混交林、下層植生の無い針広混交林、無植生地（裸地）、不嗜好性植物優占地の4つで炭素蓄積量、炭素収支を実測し、森林劣化量を炭素収支の減少量として評価する。

CiNii Research

Educational Activities

I provide fieldwork course for undergraduate and graduate students at Kyushu University Forest in Fukuoka (Sasaguri Town), Miyazaki (Shiiba Village), and Hokkaido (Ashoro Town). Additionally, as a member of the Forest ecosystem management lab, I provide support for graduation research, master's theses, and doctoral dissertations utilizing the Kyushu university forest, including supervision.

FD Participation

2025.4 Role：Participation Title：新任教員研修

Organizer：University-wide

Outline of Social Contribution and International Cooperation activities

At Kyushu University Forest, I open forest training courses for students from other universities, public lectures for the general public, and research activities for junior high school and high school students. In addition, I disseminate our research findings to the media and hold workshops.

Social Activities

森林科学分野における博士課程進学：演習林でのフィールドワーク研究

Role(s)：Appearance,　Panelist

九州大学附属図書館学際交流イベントQuricon 2023.11

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Type：Science cafe

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次世代の科学技術を担う人材育成事業若手科学者との交流会

Role(s)：Panelist,　Lecturer

福岡県教育委員会九州大学伊都キャンパス 2023.9

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Audience：High school students

Type：Lecture

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夏休みこども自由研究2023・ジュゴンズ・アイ：豊かさを知る冒険が待っている

Role(s)：Lecturer,　Planner

琉球朝日放送・株式会社Think Nature 沖縄コンベンションセンター 2023.8

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Audience：Infants,　Schoolchildren,　Junior students

Type：Seminar, workshop

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辺境キャンパスピッチ！森 vs 海・森の木が死ぬこと

Role(s)：Appearance

株式会社tayo オンライン 2022.8

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Audience：College students,　Graduate students,　General

Type：Citizen’s meeting/Assembly

大熊インキュベーションセンター・株式会社tayo主催研究ピッチウェビナー

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大学院の外部進学あるある座談会

Role(s)：Appearance

大熊インキュベーションセンター・株式会社tayo オンライン 2022.6

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Audience：College students,　Graduate students,　General

Type：Citizen’s meeting/Assembly

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毎木コミュニティMaibo主催Webセミナー・沖縄島北部の亜熱帯常緑広葉樹林における枯死有機物量の計測が二酸化炭素放出量の推定に与える影響

Role(s)：Appearance

毎木コミュニティMaibo オンライン 2021.10

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Audience：Researchesrs

Type：Citizen’s meeting/Assembly

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異分野研究コミュニティ主催第6回研究紹介セミナー・森の木が死ぬこと

Role(s)：Appearance

異分野研究コミュニティオンライン 2021.8

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Audience：Researchesrs

Type：Citizen’s meeting/Assembly

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探究活動のメンタリング

Role(s)：Advisor

東京都立大泉高等学校東京都立大泉高等学校 2021.4 - 2024.3

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Audience：High school students

Type：Research consultation

都市公園の香りの生態系サービス評価、アジサイの難分解性成分とリター分解、高校内敷地に供された落葉の廃棄に伴う二酸化炭素排出量推定など

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Media Coverage

シカよけの柵でブナ保護 Newspaper, magazine

日本経済新聞社日本経済新聞 2024.12

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Author：Other

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シカよけの柵、食べないブナも保全土壌の流出防止 Newspaper, magazine

日本経済新聞社日本経済新聞（デジタル：サイエンス） 2024.12

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Author：Other

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ブナ枯死防止に「鹿よけネット」有効熊本・白髪岳で宮崎大など研究 Newspaper, magazine

朝日新聞朝日新聞デジタル 2024.12

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Author：Other

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シカ防鹿柵は森林生態系の多様性保全に寄与している！ Internet

国立環境研究所環境展望台 2024.11

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Author：Other

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森にシカが増えると二酸化炭素ためられず？ Newspaper, magazine

朝日新聞朝日新聞 2024.6

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森にシカが増えると、二酸化炭素をためられなくなる？機能が半減も Newspaper, magazine

朝日新聞朝日新聞デジタル 2024.6

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Author：Other

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シカが増加した影響で森林が持つ炭素の蓄積量が減少していた Internet

公益財団法人つくば科学万博記念財団つくばサイエンスニュース 2024.6

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Author：Other

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シカ増加で森林の炭素吸収減 Newspaper, magazine

日本経済新聞社日本経済新聞 2024.6

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Author：Other

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増加するシカ、森林の炭素貯留量減らす九大 Newspaper, magazine

日本経済新聞社日本経済新聞（デジタル：サイエンス） 2024.6

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Author：Other

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How Sika Deer’s Overpopulation Led To Forest Decline in Kyushu Internet

Asian Scientist Asian Scientist Magazine 2024.4

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Author：Other

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Sika deer overpopulation endangers beech forests in Southern Kyushu, Japan Internet

Kyushu University EurekAleart! 2024.1

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Author：Other

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ブナの衰退、シカの食害で加速？九州南部で九大など調査 Newspaper, magazine

朝日新聞朝日新聞 2023.12

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Author：Other

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シカが招くブナ林の「負のスパイラル」根がむき出しになった結果… Newspaper, magazine

朝日新聞朝日新聞デジタル 2023.11

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シカ増加で土壌侵食九州でブナ林が衰退 Newspaper, magazine

科学新聞 2023.11

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Author：Other

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Sika deer overpopulation endangers beech forests in Southern Kyushu, Japan Internet

The Science News Science Japan 2023.11

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Author：Other

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