記述言語：その他   掲載種別：研究論文（学術雑誌）   出版者・発行元：PNAS Nexus  

Abstract

Community forests (CFs) have been widely established in tropical countries as a tool to achieve forest conservation. Many studies have shown that CFs can contribute to the reduction of deforestation, yet studies that evaluate the contribution of CFs to reducing forest degradation and facilitating forest recovery remain scarce. We investigated the ability of CFs to prevent deforestation and forest degradation and to facilitate forest recovery by using a country-scale longitudinal tree canopy cover and forest cover dataset in Cambodia. We found that CFs can prevent both forest degradation and deforestation, but we did not observe a forest recovery effect. We also found that recently established CFs are not effective for forest conservation compared with older CFs. We conclude that, to date, CFs are an effective forest conservation tool; however, this does not necessarily mean that new CFs will be as effective as established ones.

DOI： 10.1093/pnasnexus/pgad320

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記述言語：その他   掲載種別：研究論文（学術雑誌）   出版者・発行元：Journal of Forest Research  

Assessing the impact of forest type and age on shallow landslide susceptibility is important for managing protective functions of forests. Previous studies have examined the correlation between forest types and ages, and shallow landslide susceptibility, but causal effects of forest type and age on shallow landslide susceptibility are yet not clear. This study investigated the causal effect of forest type and age on shallow landslide susceptibility using a propensity score method by combining existing geo-data sets. Here, we focus on shallow landslides caused by an extreme rainfall event on 5–6 July 2017, in the mountainous areas of Asakura City and Toho Village, Fukuoka Prefecture, Japan. Randomly located samples of coniferous forest, broadleaved forest, and young forest exposed to shallow landslide events were analyzed. The inverse probability of treatment weighting with the propensity score was applied to the samples to compare the differences in shallow landslide susceptibility among the three forest classes. Young forest had increased shallow landslide susceptibility, compared with coniferous forest and broadleaved forest, by 3.70 × 10−2 and 4.12 × 10−2, respectively, which corresponded to a two to three times increase in shallow landslide susceptibility when the forest changes from coniferous or broadleaved forest to young forest. No significant difference in shallow landslide susceptibility between coniferous forest and broadleaved forest was observed. These differences in shallow landslide susceptibility should be considered when implementing forest management schemes.

DOI： 10.1080/13416979.2023.2227820

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担当区分：責任著者   記述言語：英語   出版者・発行元：Japan Society of Forest Planning  

<p>Semi-captive Asian elephants (<i>Elephas maximus</i>) engaged in forestry activities in Myanmar account for 20% of all captive and semi-captive Asian elephants in the world, and are important for both forestry and the conservation of Asian elephant populations. Understanding moving behavior of the semi-captive elephants is required to sustain them. Our specific goals are 1) to determine the moving range during free time, and 2) to determine the hourly moving distance during skidding and when off duty. Three elephants were fitted with handheld global navigation satellite systems with the signals of global positioning system to collect data on their movements. The elephants were generally located between 0.534 and 0.875 km from the camp with temporary housing of the elephant handler when not skidding (i.e., free time) and between 1.365 and 1.372 km when skidding (i.e., work time). The hourly moving distance during free time (0.622–0.655 km) and work time (1.522 and 1.629 km) did not differ greatly from the hourly moving distance of wild Asian elephants (0.010–1.500 km). The elephants remained within 0.875 km of the camp of the elephant handler, and some variation in movements among individuals was observed during free time. Thus, the conservation of forest in areas near the camp is important for the well-being of these elephants.</p>

DOI： 10.20659/jfp.2022.002

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：International Journal of Digital Earth  

Mapping of deforestation, forest degradation, and recovery is essential to characterize country-level forest change and formulate mitigation actions. Previous studies have mainly used a simple forest/non-forest classification after forest disturbance to identify deforestation and forest degradation. However, a more flexible approach that is applicable to different forest conditions is desirable. In this study, we examined an approach for mapping deforestation, forest degradation, and recovery using disturbance types and tree canopy cover estimates from annual Landsat time-series data from 1988 to 2020 across Cambodia. We developed models to estimate both disturbance types and tree canopy cover based on a random forest algorithm using predictor variables derived from a trajectory-based temporal segmentation approach. The estimated disturbance types and canopy cover in each year were then used in a rule-based classification of deforestation, forest degradation, and recovery. The producer’s and user’s accuracies ranged from 59.1% to 72.9% and 60.8% to 91.6%, respectively, for the forest change classes of mapping deforestation, forest degradation, and recovery. The approach developed here can be adjusted for different definitions of deforestation, forest degradation, and recovery according to research objectives and thus has the potential to be applied to other study areas.

DOI： 10.1080/17538947.2022.2061618

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Journal of Forest Research  

There has been growing interest in the practice of reduced-impact logging (RIL) to enhance various ecological services of selectively logged tropical forests. It is thus important to evaluate the effectiveness of different logging operations between RIL and conventional logging (CON). The Myanmar Selection System (MSS) has a long history and is well known for its use of elephants for skidding, which is considered one form of RIL. However, the difference in the impacts of logging operations between the MSS using elephants for skidding and machine-only-based operations commonly adopted in other countries is unknown. The present study evaluated ground disturbance along elephant skid trails, along logging roads and at log landings in four compartments logged under the MSS, comparing with reported values for CON and RIL in the other countries. The ground disturbance in the MSS compartments was, respectively, 2.1% and 0.4% in average for logging roads and log landings; it is not significantly different from that for CON and RIL (p > 0.05). In contrast, the disturbed area along elephant skid trails (0.9%) is much lower than that for CON (5.2%) and RIL (4.7%) (p < 0.05). A large difference in the width of skid trails was found between elephant skidding (1.0 m) and machinery (CON: 5.5 m, RIL: 4.6 m) (p < 0.0001). We conclude that elephant skidding can largely reduce ground disturbance due to much narrower width of the skid trails as compared with machine skidding, while MSS does not differ from the other countries in ground disturbance at logging roads and log landings.

DOI： 10.1080/13416979.2022.2067618

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.3390/f12050541

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.3390/f12020115

記述言語：その他   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.gecco.2020.e01214

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1007/s11676-019-01017-5

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.gecco.2020.e01340

記述言語：その他   掲載種別：研究論文（学術雑誌）  

DOI： 10.3390/f11121263

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.3390/RS12152438

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

<p>末松直輝・太田徹志・志水克人・福本桂子・溝上展也・井上昭夫・北里春香・草野秀雄・甲斐博文・大政康史：地上レーザスキャナによる林分構造の推定精度に下層植生とスキャナの設置間隔が及ぼす影響，森林計画誌54：45～54，2020 マルチスキャンを用いた地上レーザスキャナ（TLS）による林分構造の推定精度にTLSの設置間隔と下層植生の有無が与える影響を評価した。ヒノキ人工林内に設置した下層植生を完全に除去したプロットと下層植生を残したプロット3つずつを対象に，TLSの設置間隔が5mから20mまで4つのTLS計測パターンで個体検出，胸高直径（DBH）・樹高・幹材積推定を行った。その結果，下層植生がある，もしくは設置間隔が長い場合，TLSの位置合わせや個体検出，DBH推定，樹高推定，幹材積推定の精度が低下した。</p>

DOI： 10.20659/jjfp.54.1_45

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.landusepol.2020.104597

記述言語：その他   掲載種別：研究論文（学術雑誌）  

DOI： 10.3390/rs12111876

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

記述言語：その他   掲載種別：研究論文（学術雑誌）  

DOI： 10.3390/f11020195

記述言語：その他   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.isprsjprs.2019.10.004

記述言語：その他   掲載種別：研究論文（学術雑誌）  

DOI： 10.3390/F10121062

記述言語：その他   掲載種別：研究論文（学術雑誌）  

DOI： 10.3390/hydrology6030064

記述言語：その他   掲載種別：研究論文（学術雑誌）  

DOI： 10.1017/S0376892918000462

記述言語：日本語   掲載種別：研究論文（大学，研究機関等紀要）  

記述言語：その他   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.foreco.2018.10.058

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.3390/rs11161899

記述言語：その他   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.ecolecon.2018.04.036

記述言語：その他   掲載種別：研究論文（学術雑誌）  

DOI： 10.3390/su10093350

記述言語：その他   掲載種別：研究論文（学術雑誌）  

DOI： 10.3390/f9070429

記述言語：その他   掲載種別：研究論文（学術雑誌）  

DOI： 10.1080/13416979.2018.1434034

記述言語：その他   掲載種別：研究論文（学術雑誌）  

DOI： 10.3390/f9050273

記述言語：その他   掲載種別：研究論文（学術雑誌）  

DOI： 10.3390/rs10030438

記述言語：その他   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.biombioe.2017.12.011

記述言語：その他   掲載種別：研究論文（学術雑誌）  

DOI： 10.17503/agrivita.v40i1.1730

記述言語：日本語  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.3390/f8090343

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.3390/f8060218

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1139/cjfr-2016-0244

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1080/13416979.2017.1283978

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1080/13416979.2017.1322347

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1080/13416979.2017.1302545

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1505/146554816819501718

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1080/01431161.2016.1201230

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.gecco.2016.06.001

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1007/s10310-015-0504-3

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.3390/f6113882

その他リンク： http://www.mdpi.com/1999-4907/6/11/3882

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1007/s10310-014-0476-8

記述言語：その他   掲載種別：研究論文（学術雑誌）  

DOI： 10.3390/land3041270

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.3390/rs61110750

記述言語：その他  

Estimation of Growth Rates Based on Tree-ring Analysis of Cryptomeria japonica on Yakushima Island, Japan

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1007/s10310-010-0233-6

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

掲載種別：研究論文（学術雑誌）  

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

記述言語：英語  

記述言語：英語  

記述言語：日本語  

DOI： 10.4287/jsprs.46.6_4

記述言語：その他  

国名：その他  

Detection of clear-cut areas using the image differencing method with LANDSAT/TM data Detecting the occurrence of clear-cutting is a practical use for remotely sensed data, and the image differencing method is one technique that can be used. This method is simple and powerful, but a systematic evaluation of its accuracy and a statistical determination of threshold values have not been established. We examined the accuracy of image differencing methods using a single band or band combinations, or scene combinations, to detect clear-cuts with LANDSAT/ TM data. Furthermore, we examined the relationship between clear-cut size and detection accuracy with a focus on the most effective bands. Results showed that bands 3 and 7 are optimal because they detect clear-cut areas with less error. Accuracy varied with the clear-cut size, and clear-cut regions less than 1 ha in area exhibited more error.