| 片山 歩美（かたやま あゆみ） | データ更新日：2024.04.19 |
准教授 ／
農学研究院
環境農学部門
| 1. | 緒方 健人, 田代 直明, 井上 幸子, 藤山 美薫, 山内 康平, 鍜治 清弘, 扇 大輔, 村田 秀介, 村松 優子, 壁村 勇二, 南木 大祐, 中村 琢磨, 山内 耕司朗, 久保田 勝義, 佐々木 寛和, 長 慶一郎, 榎木 勉, 古賀 信也, 菱 拓雄, 笠原 玉青, 久米 朋宣, 市橋 隆自, 片山 歩美, 内海 泰弘, 九州大学農学部附属３演習林のシカライトセンサスデータ（2017‒2022）, 九州大学農学部演習林報告, 10.15017/6786325, 104, 13-16, 2023.03, 九州大学農学部附属演習林の北海道演習林（冷温帯性落葉広葉樹林），福岡演習林（暖温帯性常緑広葉樹林），宮崎演習林（温帯性落葉広葉樹林）の3箇所でスポットライトセンサス法により2017年から2022年までニホンジカの目撃頭数の変動を記録した。九州大学3演習林の内，北海道演習林では4km と3.5km のセンサスコース，福岡演習林では1.7km, と0.5km のセンサスコース，宮崎演習林では6.1km と2.8km のセンサスコースで調査を実施した。 The number of Sika deer was recorded in Ashoro Research Forest, Kasuya Research Forest and Shiiba Research Forest in the Kyushu University Forests. Ashoro Research Forest has a cool temperate deciduous forest, Kasuya Research Forest has a warm temperate evergreen forest and Shiiba Research Forest has a warm temperate deciduous forest. The spotlight census was conducted for five years from 2017 to 2022 at three locations in the Kyushu University Forests. In the three forests of the Kyushu University Forests, the census courses of the 4 km and the 3.5 km were used in Ashoro Research Forest, 1.7 km and 0.5 km in Kasuya Research Forest, and 6.1 km and 2.8 km in Shiiba Research Forest.. |
| 2. | Ayumi Katayama, Mimori Oyamada, Hayato Abe, Kazushige Uemori, Takuo Hishi, Soil erosion decreases soil microbial respiration in Japanese beech forests with understory vegetation lost by deer, Journal of Forest Research, 10.1080/13416979.2023.2235499, 1-8, 2023.07, 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.. |
| 3. | Ayumi Katayama, Kazuki Nanko, Seonghun Jeong, Tomonori Kume, Yoshinori Shinohara, Steffen Seitz, Short communication: Concentrated impacts by tree canopy drips – hotspots of soil erosion in forests, Earth Surface Dynamics, 10.5194/esurf-11-1275-2023, 11, 6, 1275-1282, 2023.12, Abstract. The degradation of ground vegetation cover caused by large grazing herbivores frequently results in enhanced erosion rates in forest ecosystems. Splash erosion can be caused by drop impacts with a high throughfall kinetic energy (TKE) from the tree canopy. Notably larger canopy drips from structurally mediated woody surface points appear to induce even higher TKE and generate concentrated impact locations causing severe focus points of soil erosion. However, TKE at these locations has rarely been reported. This pilot study investigated the intensity of TKE at a concentrated impact location and compared it with general TKE locations under the canopy and freefall kinetic energy (FKE) outside the forest. We measured precipitation, TKE and FKE using splash cups at seven locations under Japanese beech trees and five locations outside the forest during the leafless and leafed seasons in 2021 in a mixed forest with evergreen coniferous trees and deciduous broadleaved trees in Japan. The TKE at the concentrated impact location was 15.2 and 49.7 times higher than that at the general locations under the beech and FKE, respectively. This study confirmed that canopy drip from woody surfaces could be a hotspot of soil erosion in temperate forest ecosystems. Throughfall precipitation at the concentrated impact location was 11.4 and 8.1 times higher than that at general locations and freefall, respectively. TKE per 1 mm precipitation (here, “unit TKE”) at the concentrated impact location (39.2 ± 23.7 J m−2 mm−1) was much higher than that at general locations (22.0 ± 12.7 J m−2 mm−1) and unit FKE (4.5 ± 3.5 J m−2 mm−1). Unit TKE in the leafless season was significantly lower than in the leafed season because of fewer redistribution of canopy drips induced only by woody tissue. Nevertheless, unit TKE at the concentrated impact location in the leafless season (36.4 J m−2 mm−1) was still higher than at general locations in the leafed season. These results show that potentially high rates of sediment detachment can be induced not only by throughfall precipitation but also by larger throughfall drop size distributions at the concentrated impact location, even in the leafless season. Further studies with more replication building on this first report are necessary to investigate how many of these concentrated impact locations may occur on average with different tree species to better assess the extent of the erosion risk under forests.. |
| 4. | Tatsuro Nakaji, Naoki Makita, Ayumi Katayama, Hiroyuki Oguma, Belowground spectroscopy — Novel spectral approach for estimation of vertical and species-specific distributions of forest soil characteristics and heterotrophic respiration, Agricultural and Forest Meteorology, 10.1016/j.agrformet.2023.109563, 339, 109563-109563, 2023.08. |
| 5. | Hayato Abe, Tomonori Kume, Fujio Hyodo, Mimori Oyamada, Ayumi Katayama, Soil erosion under forest hampers beech growth: Impacts of understory vegetation degradation by sika deer, Catena, 10.1016/j.catena.2023.107559, 234, 2024.01, 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.. |
| 6. | Yuji Tokumoto, Ayumi Katayama, Effects of Pieris japonica (Ericaceae) dominance on cool temperate forest altered-understory environments and soil microbiomes in Southern Japan, PLoS ONE, 10.1371/journal.pone.0296692, 19, 1 January, 2024.01, The number of plants unpalatable to deer increases with increasing deer numbers. In the Kyushu Mountain area of Southern Japan, Pieris japonica (Ericaceae), an unpalatable shrub, has become the monodominant vegetation under evergreen conifer and deciduous broad-leaved tree stands. The monodominance of unpalatable plants in the understory has potential advantages and drawbacks; however, the effects of Pieris dominance are not well understood. To assess the effects of P. japonica dominances on forest environments and ecosystems, we investigated understory environments and soil microbiomes in Pieris-dominant sites. Under the deciduous broad-leaved trees, Pieris dominance leads to considerable Pieris leaf litter and humus weights and low soil bulk density and canopy openness. In the soil fungal community and fungal functional groups, the relative abundance of symbiotrophic fungi, particularly ectomycorrhizal fungi in Pieris-dominant sites were lower than in other-vegetation understory sites and saprotrophic fungi vice versa. Because few seedlings and saplings were found under Pieris shrubs, Pieris dominance in the understory might exclude other plant species. The results of this study will contribute to the Pieris population and forest management following deer overgrazing.. |
| 7. | Marly Orrego, Ayumi Katayama, Motohiro Hasegawa, Tsutomu Enoki, Dead bamboo culms promote litter mass, carbon and nitrogen loss, but do not modulate the effect of soil fauna on litter decomposition, European Journal of Soil Biology, 10.1016/j.ejsobi.2023.103493, 117, 2023.07, Bamboos contribute significantly to carbon cycling in many (sub)tropical and temperate forests. In East Asia, unmanaged Moso bamboo stands accumulate large amounts of dead culms. However, very little is known about the indirect effects of dead culms on biogeochemical cycling through changes in soil conditions and decomposer communities. We evaluated the interactive effects of dead culms and soil fauna on litter decomposition in an unmanaged Moso bamboo stand. We placed leaf litter beneath the dead culms and on the forest floor (control) and used litterbags with different mesh sizes (1 mm and 42 μm) to control the access of soil mesofauna to the litter. We hypothesized that dead culms and soil fauna synergistically accelerate litter decomposition mainly because dead culms influence soil conditions and alter the litter fauna assemblage. We found that litter decomposing under the dead culms had greater litter mass, carbon and nitrogen loss, and microbial respiration rates than the control. The presence of soil mesofauna decreased litter mass, carbon and nitrogen loss but had no effect on the microbial respiration rate. Soil moisture was consistently higher under the dead culms, but their effect on soil temperature was dependent on the season. The litter decomposing below the dead culms had relatively higher mesofauna abundance and order richness. However, the contribution of the mesofauna to litter mass and nutrient loss was not modulated by the dead culms, suggesting that soil fauna had essentially the same effect on litter decomposition irrespective of the presence of dead culms. We showed that dead bamboo culms influence litter nutrient dynamics and promote habitat heterogeneity for soil microarthropods. Our results further highlight the ecological role played by dead culms and have implications for Moso bamboo management. The removal of dead culms from the forest floor could have substantial impact on the soil biota and ecosystem processes in managed stands.. |
| 8. | Kazuho Matsumoto, Kei Terasawa, Shingo Taniguchi, Mizue Ohashi, Ayumi Katayama, Tomonori Kume, Atsushi Takashima, Spatial and seasonal variations in soil respiration in a subtropical forest in Okinawa, Japan, ECOLOGICAL RESEARCH, 10.1111/1440-1703.12386, 38, 3, 479-490, 2023.05, To clarify soil respiration (soil CO2 efflux, R-s) characteristics in a subtropical evergreen broad-leaved natural forest in Yambaru, Okinawa, Japan, we examined spatiotemporal variation in R-s and its determining factors. We then compared yearly R-s with the value in other forests. The spatial variation in R-s (coefficient of variation [CV] = 38.9%) was not significantly related to temperature or soil water content but was evidently dependent on ground surface litter coverage. R-s was greater in summer (ca. 7-10 mu mol m(-2) s(-1)), and its seasonal variation was exponentially related to soil temperature (Q(10) = 2.16). As a function of soil temperature, we estimated a yearly mean stand-scale R-s of 5.17 mu mol m(-2) s(-1), and a total carbon efflux from the soil of 1959 g C m(-2) year(-1) for 2014. Despite showing similar seasonal patterns as those in temporal forests, the R-s in this ecosystem is very high throughout the year, and the yearly value is much higher for natural mature forests. A mass balance approach suggests that the large amount of belowground carbon allocation of plants contributed to the high CO2 emissions from the soils.. |
| 9. | Takuo Hishi, Erika Kawakami, Ayumi Katayama, Changes in the abundance and species diversity of Collembola community along with dwarf bamboo density gradient in a mountainous temperate forest of Japan, Applied Soil Ecology, 10.1016/j.apsoil.2022.104606, 180, 104606-104606, 2022.12. |
| 10. | Hayato Abe, Ayumi Katayama, Shingo Taniguchi, Atsushi Takashima, Tomonori Kume, Kazuho Matsumoto, 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, ECOLOGICAL RESEARCH, 10.1111/1440-1703.12317, 37, 5, 609-622, 2022.09, Dead organic matter (DOM), which consists of leaf litter, fine woody debris (FWD; = 28,750 m(2) and >= 2058-42,875 m(2), 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.. |
| 11. | Kobayashi Makoto, Pamela H. Templer, Ayumi Katayama, Osamu Seki, Kentaro Takagi, Early snowmelt by an extreme warming event affects understory more than overstory trees in Japanese temperate forests, ECOSPHERE, 10.1002/ecs2.4182, 13, 7, 2022.07, The occurrence of extreme warm events and early snowmelt is predicted to increase in high-latitude ecosystems, even during periods of time when there is no coincident reduction in total precipitation. However, because extreme events like these occur unpredictably, little is known about how advancing snowmelt by a single extreme warm event, without a reduction in precipitation amount, influences overstory trees and understory vegetation simultaneously in an ecosystem. We conducted a warming experiment (four 20 x 20 m plots) in temperate forests of Japan to determine the effects of earlier snowmelt on both understory dwarf bamboo plants and overstory birch trees. Our experimental treatment advanced snowmelt by about 10 days and increased soil temperatures that were associated with increased rates of soil nitrogen (N) mineralization and nitrification. Furthermore, these changes led to lower C:N ratios of leaves together with the greater growth of understory bamboo vegetation, with no changes in leaf C:N or growth rates of overstory birch trees. Together, our results demonstrate that advancing snowmelt by an extreme warm event in temperate forests is likely to affect N cycling and will benefit understory vegetation without a commensurate change in overstory vegetation, likely due to the increase in available soil N. These results also demonstrate that with the projected increase in the frequency of extreme warm events and advanced snowmelt, understory vegetation is likely to benefit more than overstory trees in Japanese temperate forests with heavy snow.. |
| 12. | Yoshinori Shinohara, Shin'ichi Iida, Tomoki Oda, Ayumi Katayama, Kenji Tsuruta, Takanori Sato, Nobuaki Tanaka, Man-Ping Su, Sophie Laplace, Yoshio Kijidani, Tomonori Kume, Are calibrations of sap flow measurements based on thermal dissipation needed for each sample in Japanese cedar and cypress trees?, TREES-STRUCTURE AND FUNCTION, 10.1007/s00468-022-02283-3, 2022.04, Key message As the estimated parameters differed across samples, even from the same site, sample-based calibration is the recommended procedure. A trait-based approach (i.e., the use of structural parameters of the trees) would be an alternative procedure. The thermal dissipation method (TDM) is widely used for estimating transpiration by individual trees or stands. Although the importance of TDM calibration experiments is widely recognized, there is still no consensus on whether the calibration should be undertaken in practice for each species, site, or tree sample. The primary reason is that intraspecific variations in the fitting parameters have not been well examined in multiple sites. To address this, we performed TDM calibration experiments using 24 Cryptomeria japonica and Chamaecyparis obtusa samples collected from six regions in Japan and Taiwan. The sap flux density (F-d) based on the original TDM parameters was underestimated for most samples. Using a common set of parameters for 21 samples reduced the systematic underestimation. In addition, root mean square error (RMSE) was reduced by 44%. Site- and sample-based calibration reduced the RMSE by 69% and 75%, respectively. The estimated parameters for the samples varied, even among samples obtained from the same site. The recommended procedure is to obtain sample-specific parameters by performing a calibration experiment after measuring F-d under the target conditions. An alternative procedure is to use the parameters for other trees of the same species at the same site. Further, we discovered that one of the two parameters determined for each sample significantly correlated with the diameter/age ratio and height of the corresponding tree. A trait-based approach for predicting calibration parameters based on associated tree features allows the parameters to be determined without the need for calibration experiments.. |
| 13. | Eiko M. Uchida, Ayumi Katayama, Yuko Yasuda, Tsutomu Enoki, Kyoichi Otsuki, Shinya Koga, Yasuhiro Utsumi, Age-Related Changes in Culm Respiration of Phyllostachys pubescens Culms With Their Anatomical and Morphological Traits, Frontiers in Forests and Global Change, 10.3389/ffgc.2022.868732, 5, 2022.04, Compared to trees, little is known about the respiratory characteristics of bamboo, especially culm respiration. In this study, we measured the respiration rates of current year, 2, 3, and above 4-year-old Moso bamboo (Phyllostachys pubescens) culms and examined its relation to culm morphology and anatomical structure. Current year culms had substantially higher respiration rates (1.9 ± 0.46 μmol m–2 s–1) compared to older culms (2, 3, and above 4-year-old average: 0.17 ± 0.09 μmol m–2 s–1). Culm wood density increased with age, with the concurrent thickening of parenchyma cell walls in the culm tissue. Nitrogen content in the culm tissue decreased with culm age. Both culm wood density and nitrogen content had significant relationships with culm respiration rate. On the other hand, culm height, wall thickness, and circumference did not affect culm respiration rate. Although bamboo culms did not change in size through the year, anatomical changes in the culm tissue that accompanied the aging of a culm affected the respiration. The culm age would have a significant effect on the evaluation of the respiratory characteristics of the bamboo forest. Our results suggested that young culms required a large amount of respiration to grow “inward” as cell wall thickening and also to maintain the relatively large amount of active tissue.. |
| 14. | Erika Kawakami, Mioko Ataka, Tomonori Kume, Kohei Shimono, Masayoshi Harada, Takuo Hishi, Ayumi Katayama, Root exudation in a sloping Moso bamboo forest in relation to fine root biomass and traits, PLoS ONE, 10.1371/journal.pone.0266131, 17, 3 March, 2022.03. |
| 15. | 阿部 隼人, 付 東川, 久米 朋宣, 片山 歩美, 下層植生が消失した針広混交林における樹木根系の露出とその制御要因, 10.15017/4776829, 103, 13-20, 2022.03. |
| 16. | 緒方 健人, 久米 朋宣, 片山 歩美, 井上 幸子, 九州大学早良実習場長期気象観測データの整理統合, 10.15017/4776830, 103, 21-28, 2022.03. |
| 17. | 山内 耕司朗, 片山 歩美, 市橋 隆自, 久米 朋宣, 井上 幸子, 扇 大輔, 南木 大祐, 中村 琢磨, 九州大学農学部附属演習林宮崎演習林におけるブナ科樹木萎凋病の被害報告, 10.15017/4776865, 103, 41-44, 2022.03. |
| 18. | Ting-Wei CHANG, Yoshiko KOSUGI, Tomonori KUME, Ayumi KATAYAMA, Motonori OKUMURA, Ken-Hui CHANG, Dependance of isoprene emission flux on leaf mass per area of Phyllostachys pubescens (moso bamboo), JOURNAL OF AGRICULTURAL METEOROLOGY, 10.2480/agrmet.D-21-00030, 78, 1, 1-7, 2022.01. |
| 19. | Ayumi Katayama, Izuki Endo, Naoki Makita, Kazuho Matsumoto, Tomonori Kume, Mizue Ohashi, Vertical variation in mass and CO2 efflux of litter from the ground to the 40m high canopy in a Bornean tropical rainforest, AGRICULTURAL AND FOREST METEOROLOGY, 10.1016/j.agrformet.2021.108659, 311, 2021.12. |
| 20. | Kohei Shimono, Ayumi Katayama, Tomonori Kume, Tsutomu Enoki, Masaaki Chiwa, Takuo Hishi, Differences in net primary production allocation and nitrogen use efficiency between Moso bamboo and Japanese cedar forests along a slope, JOURNAL OF FOREST RESEARCH, 10.1080/13416979.2021.1965280, 27, 1, 28-35, 2021.08. |
| 21. | 菱拓雄、川上えりか、片山歩美, 林相と斜度の異なる林分間では下層植生が土壌のトビムシ群集 に与える影響が異なる, 九州大学農学部演習林報告, 102, 15-21, 2021.03.  |
| 22. | 下野 皓平, 片山 歩美, 阿部 隼人, 榎木 勉, 放棄モウソウチク林における枯死木質有機物の炭素・窒素蓄積量, 九州大学農学部演習林報告, 10.15017/4377826, 102, 9-14, 2021.03. |
| 23. | Farahnak, Moein; Mitsuyasu, Keiji; Hishi, Takuo; Katayama, Ayumi; Chiwa, Masaaki; Jeong, Seonghun; Otsuki, Kyoichi; Sadeghi, Seyed Mohammad Moein; Kume, Atsushi, Relationship between Very Fine Root Distribution and Soil Water Content in Pre- and Post-Harvest Areas of Two Coniferous Tree Species, FORESTS, 10.3390/f11111227, 11, 11, 2020.11. |
| 24. | Erika Kawakami, Ayumi Katayama, Takuo Hishi, Effects of declining understory vegetation on leaf litter decomposition in a Japanese cool-temperate forest, Journal of Forest Research, 10.1080/13416979.2020.1759884, In Press, 1-9, 2020.05. |
| 25. | 川上えりか、片山歩美、菱拓雄, 下層植生であるアセビの有無がリター分解に与える影響, 101, 1-6, 2020.03. |
| 26. | 川上えりか, 片山歩美, 菱拓雄, 下層植生であるアセビの有無がリター分解に与える影響, 九州大学農学部演習林報告, 101, 101, 1-6, 2020.03. |
| 27. | Mioko Ataka, Lijuan Sun, Tatsuro Nakaji, Ayumi Katayama, Tsutom Hiura, Five-year nitrogen addition affects fine root exudation and its correlation with root respiration in a dominant species, Quercus crispula, of a cool temperate forest, Japan, Tree physiology, 10.1093/treephys/tpz143, 40, 3, 367-376, 2020.01. |
| 28. | Mioko Ataka, Lijuan Sun, Tatsuro Nakaji, Ayumi Katayama, Tsutom Hiura, Five-year nitrogen addition affects fine root exudation and its correlation with root respiration in a dominant species, Quercus crispula, of a cool temperate forest, Japan., Tree physiology, 10.1093/treephys/tpz143, 2020.01. |
| 29. | Endo, Izuki, Kume, Tomonori, Kho, Lip Khoon, Katayama, Ayumi, Makita, Naoki, Ikeno, Hidetoshi, Ide, Jun'ichiro, Ohashi, Mizue, Spatial and temporal patterns of root dynamics in a Bornean tropical rainforest monitored using the root scanner method, PLANT AND SOIL, 10.1007/s11104-019-04203-w, 443, 1-2, 323-335, 2019.10. |
| 30. | Izuki Endo, Tomonori Kume, Lip Khoon Kho, Ayumi Katayama, Naoki Makita, Hidetoshi Ikeno, Junichiro Ide, Mizue Ohashi, Spatial and temporal patterns of root dynamics in a Bornean tropical rainforest monitored using the root scanner method, Plant and Soil, 10.1007/s11104-019-04203-w, 443, 1-2, 323-335, 2019.08, [URL]. |
| 31. | Katayama, Ayumi, Kume, Tomonori, Ichihashi, Ryuji, Nakagawa, Michiko, Vertical variation in wood CO2 efflux is not uniformly related to height: measurement across various species and sizes of Bornean tropical rainforest trees, TREE PHYSIOLOGY, 10.1093/treephys/tpz022, 39, 6, 1000-1008, 2019.06. |
| 32. | Mizue Ohashi, Naoki Makita, Ayumi Katayama, Tomonori Kume, Kazuho Matsumoto, Tomo'omi Kumagai, Izuki Endo, Lip Khoon Kho, Characteristics of root decomposition based on in situ experiments in a tropical rainforest in Sarawak, Malaysia: impacts of root diameter and soil biota, PLANT AND SOIL, 10.1007/s11104-018-03929-3, 436, 1-2, 439-448, 2019.03. |
| 33. | Ayumi Katayama, Lip Khoon Kho, Naoki Makita, Tomonori Kume, Kazuho Matsumoto, Mizue Ohashi, Estimating fine root production from ingrowth cores and decomposed roots in a Bornean tropical rainforest, Forests, 10.3390/f10010036, 10, 1, 2019.01. |
| 34. | Tomonori Kume, Mizue Ohashi, Naoki Makita, Lip Khoon Kho, Ayumi Katayama, Izuki Endo, Kazuho Matsumoto, Hidetoshi Ikeno, Image analysis procedure for the optical scanning of fine-root dynamics: errors depending on the observer and root-viewing window size., Tree physiology, 10.1093/treephys/tpy124, 38, 12, 1927-1938, 2018.12. |
| 35. | 片山 歩美, 下野 晧平, 井上 幸子, 扇 大輔, 大崎 繁, 大東 且人, 壁村 勇二, 榎木 勉, 内海 泰弘, 福岡県篠栗町の放棄モウソウチク林およびマダケ林におけるタケノコ採取の有無が地上部バイオマスに与える影響, 九州大学農学部演習林報告, 99, 13-17, 2018.03. |
| 36. | Ayumi Katayama, Tsutomu Enoki, Tomonori Kume, Kyoichi Otsuki, Characteristics of soil respiration in upper and lower slope positions with different aboveground biomass A case study in a Japanese cypress forest, J. AGRICULTURAL METEOROLOGY, 10.2480/agrmet.D-17-00019, 74, 2, 63-70, 2018.01, [URL]. |
| 37. | Tomonori Kume, Mizue Ohashi, Naoki Makita, Lip Khoon Kho, Ayumi Katayama, Izuki Endo, Kazuho Matsumoto, Hidetoshi Ikeno, Image analysis procedure for the optical scanning of fine-root dynamics Errors depending on the observer and root-viewing window size, Tree physiology, 10.1093/treephys/tpy124, 38, 12, 1927-1938, 2018.01, [URL]. |
| 38. | Tomonori Kume, Kenji Tsuruta, Hikaru Komatsu, Yoshinori Shinohara, Ayumi Katayama, Jun'ichiro Ide, Kyoichi Otsuki, Differences in sap flux-based stand transpiration between upper and lower slope positions in a Japanese cypress plantation watershed, ECOHYDROLOGY, 10.1002/eco.1709, 9, 6, 1105-1116, 2016.09. |
| 39. | Chen-Wei Chiu, Hikaru Komatsu, Ayumi Katayama, Kyoichi Otsuki, Scaling-up from tree to stand transpiration for a warm-temperate multi-specific broadleaved forest with a wide variation in stem diameter, JOURNAL OF FOREST RESEARCH, 10.1007/s10310-016-0532-7, 21, 4, 161-169, 2016.08. |
| 40. | Katayama, A., Kume, T., Ohashi, M., Matsumoto, K., Nakagawa, M., Saito, T., Kumagai, T., Otsuki, K., Characteristics of wood CO2 efflux in a Bornean tropical rainforest, Agricultural and Forest Meteorology, 220, 15, 190-199, 2016.04. |
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| 50. | Komatsu H., Katayama A., Kume T., Otsuki K., Sap-flow velocity reduction by soil water deficit observed in a Lithocarpus edulis forest on Kyushu Island, Japan, Bulletin of Kyushu University Forest., 2007.03. |
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