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21 results on '"Chann, Sophal"'

1. Topographical patterns of species composition in a deciduous dipterocarp forest in Kratie Province, Cambodia

Author

Ito, Eriko, Furuya, Naoyuki, Ohnuki, Yasuhiro, Miyamoto, Kazuki, Araki, Makoto, Tamai, Koji, Shimizu, Takanori, Iida, Shin'ichi, kanzaki, Mamoru, Monda, Yukako, Kabeya, Naoki, Yagi, Takanobu, Shimizu, Akira, Toriyama, Jumpei, Tith, Bora, Keth, Samkol, Ly, Chandararity, Op, Phallaphearaoth, Chann, Sophal, and Kiyono, Yoshiyuki

Subjects
forest type, forest floor vegetation, topography, spatial heterogeneity, tree recruitment, Conservation, dry dipterocarp forest, forest fire
Published
2022

5. Practicalities of Non-Destructive Methodologies in Monitoring Anthropogenic Greenhouse Gas Emissions from Tropical Forests under the Influence of Human Intervention

Author

Mitsuo Matsumoto, Preap Sam, Satoshi Saito, Chann Sophal, Chairil Anwar Siregar, Tomoaki Takahashi, Bora Tith, Jumpei Toriyama, Tamotsu Sato, Yoshio Awaya, Y. Ochiai, Yoshiyuki Kiyono, Yoshio Inoue, Hidetoshi Asai, Naoyuki Furuya, and Eriko Ito

Subjects
Ecology, Land use, Logging, Plant community, Forestry, Subtropics, Land cover, Greenhouse gas, Forest ecology, Environmental science, Animal Science and Zoology, Agronomy and Crop Science, Stock (geology), Biotechnology
Abstract

We examined non-destructive methodologies for practicalities in monitoring anthropogenic greenhouse gas (GHG) emissions from tropical dry-land forest under the influence of various forms of human intervention. Spaceborne SAR withstood comparison with Landsat ETM+ in land cover classification of degraded tropical forest. For measurement of carbon stock and GHG flux per unit land area, the gain-loss method requires both growth rate and removal rate of forest carbon stock. However, the latter has rarely been obtained in tropical forest. For the stock-difference method, permanent sampling plot data can be used to estimate mean carbon stock per unit land area of each forest type. For cyclic land use that includes a clear-cutting stage such as slash-and-burn agriculture, chronosequential changes in carbon stock can be predicted by determining the time and spatial-distribution of cleared land. Changes in forest biomass by logging, storm-damage, etc., may be identified by monitoring the presence and diameter of the crowns of overstory trees. We developed five equations containing the parameter for crown diameter for estimating tree biomass. Overstory height can be a parameter for estimating ecosystem carbon stock of various plant communities, and forest height can be measured by airborne and spaceborne sensors, etc. Generic equations containing the parameter for overstory height are available for estimating community biomass of tropical and subtropical forests. PALSAR has an advantage over other remote systems by enabling frequent sensing and semi-direct biomass estimation using backscattering coefficients. However, no reasonable remote sensing methods exist for monitoring the amount of carbon loss by forest conversion and logging in forests with high biomass. To compensate for the faults of the present PALSAR methodologies and to enable practical and frequent monitoring of all types of forests by humans, it is vital to devise a new methodology to detect changes in high-biomass forests.

Published
2011
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6. A feasibility study for determining the mean annual aboveground biomass gain of tropical seasonal forests in Cambodia

Author

Kiyono, Yoshiyuki, primary, Ito, Eriko, additional, Monda, Yukako, additional, Toriyama, Jumpei, additional, Saito, Hideki, additional, Furuya, Naoyuki, additional, Sum, Thy, additional, Tith, Bora, additional, Keth, Nang, additional, Keth, Samkol, additional, Chandararity, Ly, additional, Phallaphearaoth, Op, additional, Chann, Sophal, additional, and Sokh, Heng, additional

Published
2017
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8. <S1-10> Wood density and water content in diverse species from lowland dipterocarp rainforest and dry dipterocarp forest

Author

Tanaka, Kenzo, Ichie, Tomoaki, Inoue, Yuta, Kendawang, Joseph Jawa, Chann, Sophal, Tanaka, Kenzo, Ichie, Tomoaki, Inoue, Yuta, Kendawang, Joseph Jawa, and Chann, Sophal

Abstract

We compared the wood density and water content of various tree species in lowland dipterocarp rainforest in Sarawak and dry dipterocarp forest in Cambodia. We collected wood core samples of 134 species from Lambir National Park, Sarawak and those of 44 species from Kratie Province, Cambodia. Sarawak (0.64 g cm-3) and Cambodia (0.64 g cm-3) did not differ in average wood density. In contrast, wood water content in Cambodia (0.42 g cm-3) showed significantly larger values than that in Sarawak (0.35 g cm-3). There was a negative correlation between wood density and water content in Cambodian trees, while the relation was not significant for Sarawak trees. The higher water content in Cambodian trees may indicate the greater importance of stem water storage under the drier environment in dry dipterocarp forest than in lowland dipterocarp rainforest.

Published
2016

9. Allometric Equations for Tropical Seasonal Deciduous Forests in Cambodia: A Method of Estimating Belowground Tree Biomass with Reduced Sampling Loss of Roots

Author

MONDA, Yukako, primary, ITO, Eriko, additional, KIYONO, Yoshiyuki, additional, SATO, Tamotsu, additional, TORIYAMA, Jumpei, additional, SOKH, Heng, additional, CHANN, Sophal, additional, TITH, Bora, additional, KETH, Samkol, additional, PHALLAPHEARAOTH, Op, additional, and BOUNTHABANDID, Soukanh, additional

Published
2016
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10. Considering the practical rationality of experimental operation in developing countries: Reality and challenges under a rigid community forestry system in Cambodia

Author

Kurashima, Takayuki, Matsuura, Toshiya, Miyamoto, Asako, Sano, Makoto, Chann, Sophal, Kurashima, Takayuki, Matsuura, Toshiya, Miyamoto, Asako, Sano, Makoto, and Chann, Sophal

Abstract

Influential stakeholders have highlighted many constraints inherent in conventional scientific forest management plans for community forestry (CF) and presented simpler alternatives. Nevertheless, some developing countries continue to use rigid, complex and high-cost plans and regulations. This article considers two issues: (1) why heavily-regulated or rigid CF systems were originally introduced and why they continue to be used in developing countries despite critiques and counterproposals; and (2) under what circumstances will such CF systems face an impasse, and what can be done to resolve the situation. Using Cambodia as a case study, we examine the development of a rigid CF system, review negative factors influencing the upland forested area, clarify the unfavorable situations arising from these factors and discuss likely problems associated with the CF management system. International organizations played a key role in the introduction and maintenance of rigid, complex and high-cost CF systems in Cambodia. Conflicts and crises arise when the administration prosecutes local farmers for illegal cultivation or deprives communities of CF management rights because of the expansion of commercial crop cultivation and the lack of adequate community management in response to unprecedented changes. A likely practical solution to the probable impasse is the development and funding of a functional network of CF management committees, rather than the adoption of an entirely new, alternative system.

Published
2015

11. Aboveground Biomass Estimation Using Structure from Motion Approach with Aerial Photographs in a Seasonal Tropical Forest

Author

Ota, Tetsuji, primary, Ogawa, Miyuki, additional, Shimizu, Katsuto, additional, Kajisa, Tsuyoshi, additional, Mizoue, Nobuya, additional, Yoshida, Shigejiro, additional, Takao, Gen, additional, Hirata, Yasumasa, additional, Furuya, Naoyuki, additional, Sano, Takio, additional, Sokh, Heng, additional, Ma, Vuthy, additional, Ito, Eriko, additional, Toriyama, Jumpei, additional, Monda, Yukako, additional, Saito, Hideki, additional, Kiyono, Yoshiyuki, additional, Chann, Sophal, additional, and Ket, Nang, additional

Published
2015
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18. Soil Carbon Stock in Cambodian Monsoon Forests

Author

TORIYAMA, Jumpei, primary, OHTA, Seiichi, additional, OHNUKI, Yasuhiro, additional, ITO, Eriko, additional, KANZAKI, Mamoru, additional, ARAKI, Makoto, additional, CHANN, Sophal, additional, TITH, Bora, additional, KETH, Samkol, additional, HIRAI, Keizo, additional, and KIYONO, Yoshiyuki, additional

Published
2011
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20. Estimating Diameter at Breast Height from Measurements of Illegally Logged Stumps in Cambodian Lowland Dry Evergreen Forest

Author

ITO, Eriko, primary, FURUYA, Naoyuki, additional, TITH, Bora, additional, KETH, Samkol, additional, CHANDARARITY, Ly, additional, CHANN, Sophal, additional, KANZAKI, Mamoru, additional, AWAYA, Yoshio, additional, NIIYAMA, Kaoru, additional, OHNUKI, Yasuhiro, additional, ARAKI, Makoto, additional, SATO, Tamotsu, additional, MATSUMOTO, Mitsuo, additional, and KIYONO, Yoshiyuki, additional

Published
2010
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21. Considering the Practical Rationality of Experimental Operation in Developing Countries: Reality and Challenges under a Rigid Community Forestry System in Cambodia.

Author

Takayuki Kurashima, Toshiya Matsuura, Asako Miyamoto, Makoto Sano, and Chann, Sophal

Subjects
COMMUNITY forestry, FORESTS & forestry, FOREST management, LOGGING, FOREST monitoring
Abstract

Influential stakeholders have highlighted many constraints inherent in conventional scientific forest management plans for community forestry (CF) and presented simpler alternatives. Nevertheless, some developing countries continue to use rigid, complex and high-cost plans and regulations. This article considers two issues: (1) why heavily-regulated or rigid CF systems were originally introduced and why they continue to be used in developing countries despite critiques and counterproposals; and (2) under what circumstances will such CF systems face an impasse, and what can be done to resolve the situation. Using Cambodia as a case study, we examine the development of a rigid CF system, review negative factors influencing the upland forested area, clarify the unfavorable situations arising from these factors and discuss likely problems associated with the CF management system. International organizations played a key role in the introduction and maintenance of rigid, complex and high-cost CF systems in Cambodia. Conflicts and crises arise when the administration prosecutes local farmers for illegal cultivation or deprives communities of CF management rights because of the expansion of commercial crop cultivation and the lack of adequate community management in response to unprecedented changes. A likely practical solution to the probable impasse is the development and funding of a functional network of CF management committees, rather than the adoption of an entirely new, alternative system. [ABSTRACT FROM AUTHOR]

Published
2015
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