KOZAN, Osamu

Position: Associate Professor

MAIL: kozan [at] cseas.kyoto-u.ac.jp

Research Departments

Environmental Coexistence



Research Interests

Hydrological process and fire mechanism in tropical peatland in Indonesia
Research on the interaction between continental scale hydrological cycle and human activities

Tropical regions have vast expanses of tropical rainforest sustained by abundant solar energy and rainfall, but in recent years the forests of these regions have been steadily shrinking. Tropical rainforests are undergoing development at such a rapid rate that development has even spread to peat swamp forests, which were previously considered unsuitable. The peat swamp forests of Indonesia were once the last frontier of the tropics, but in recent years they have been cleared on a massive scale for conversion to oil palm plantations and plantations of eucalyptus or acacia to supply raw material for the pulp industry. The problem with peat swamp development is that where once the ground was saturated with water, the water is drained off by a network of drainage canals; this changes the hydrological cycle of the region. Drainage causes the peat swamp to dry out, which causes the organic material stored in huge quantities in the soil to break down. At the same time, the dry soil leads to frequent outbreaks of fire.
      Large scale land use and land cover changes could lead to irreversible changes. Especially, the many islands of Indonesia and their shallow surrounding seas provide a large scale environment that is neither purely oceanic nor terrestrial, and has been termed the Maritime Continent. The Maritime Continent lies at the heart of the Indian and Pacific Warm Pool, whose strong convective heating plays a dominant role in driving the atmospheric circulation over the entire tropical Indian and Pacific Oceans and has a significant influence on the extra tropical circulation. Over this geospheric complex system, land surface process is the key factor to discuss the sustainability in this region. We started multi-disciplinary research including atmospheric, hydrological and carbon cycles. The health impacts of smoke haze caused by peatland fires in Indonesia is evaluated. Specifically, I conducted air quality monitoring during haze seasons for proper exposure assessment and epidemiological studies in Pekanbaru, Riau. These results are compared with the aerosol concentration estimated from the satellite

  • Osamu Kozan, “Rainfall and Groundwater Level Fluctuations in the Peat Swamps”, 2016, 英語, Catastrophe and Regeneration in Indonesia’s Peatlands. Springer, NUS Press, 296-311.
  • 川井 秀一・藤田 素子・水野 広祐, 『講座生存基盤論第4巻 ─熱帯バイオマス社会の再生――インドネシアの泥炭湿地から』(第10章の執筆担当), 2012, 日本語, 京都大学学術出版会
  • 柳澤 雅之・河野 泰之・甲山治・神崎 護, 『生存基盤論第2巻 地球圏・生命圏の潜在力── 熱帯地域社会の生存基盤』, 2012, 日本語, 都大学学術出版会
  • 杉原 薫・川井秀一・河野泰之・田辺明生, 『地球圏・生命圏・人間圏:持続的生存基盤とは何か』(第4章の執筆担当), 2010, 日本語, 京都大学学術出版会
  • Tran Van Do, Phung Dinh Trung, Mamoru Yamamoto, Osamu Kozan, Nguyen Toan Thang, Dang Van Thuyet, Hoang Van Thang, Nguyen Thi Thu Phuong, Ninh Viet Khuong & Ngo Van Cam, “Aboveground biomass increment and stand dynamics in tropical evergreen broadleaved forest”, Journal of Sustainable Forestry, 2017/09, 有, 英語
  • Kok-Boon Neoh, Lee-Jin Bong, Ahmad Muhammad, Masayuki Itoh, Osamu Kozan, Yoko Takematsu, Tsuyoshi Yoshimura, “The effect of remnant forest on insect successional response in tropical fire-impacted peatland: A bi-taxa comparison”, PLoS One,12,3,1-17, 2017/03, 有, 英語
  • TRAN VAN DO, TAMOTSU SATO, VO DAI HAI, NGUYEN TOAN THANG, NGUYEN TRONG BINH, NGUYEN HUY SON, DANG VAN THUYET, BUI THE DOI, HOANG VAN THANG, TRIEU THAI HUNG, TRAN VAN CON, OSAMU KOZAN, LE VAN THANH, NGO VAN CAM, “Aboveground biomass and tree species diversity along altitudinal gradient in Central Highland, Vietnam”, Tropical Ecology,58,1,95-104, 2017/01, 有, 英語
  • Tran Van Do, Osamu Kozan, Le Xuan Truong, Nguyen Toan Thang, Dang Van Thuyet, Phung Dinh Trung and Nguyen Thi Thu Phuong, “Fine root Production in Evergreen Broadleaved Forest, Northeast Vietnam”, Open Journal of Plant Science,18-21, 2016/12, 有, 英語
  • TV Do, NV Cam, T Sato, NT Binh, O Kozan, NT Thang and R Mitlöhner, “Post-Logging Regeneration and Growth of Commercially Valuable Tree Species in Evergreen Broadleaf Forest, Vietnam”, Journal of Tropical Forest Science,28,426-435, 2016/10, 有
  • Md R Ali, B Das, Md H Islam, Md A Momin and O Kozan, “Solar energy based lighting and ventilation system for rural poultry house in Bangladesh”, Journal of Agricultural Machinery and Bio-resources Engineering,7,1, 2016/09, 有, 英語
  • Ryosuke KAJITA and Osamu KOZAN, “Earthquakes in Indonesia from 1500 to 1938: Estimation of Rossi-Forel seismic intensity scale of ground motions described in the historical materials of Dutch colonial era”,35,105-116, 2016/09, 有, 日本語
  • Neoh, K.-B., Bong, L.- J., Muhammad, A., Itoh, M., Kozan, O., Takematsu Y. and Yoshimura, T., “The impact of tropical peat fire on termite assemblage in Sumatra, Indonesia: reduced complexity of community structure and survival strategies”, Environmental Entomology,45,5,1170-1177, 2016/08, 有, 英語
  • Yoshiya Touge, Kenji Tanaka, Temur Khujanazarov, Kristina Toderich, Osamu Kozan, Eiichi Nakakita, “Developing a Water Circulation Model in the Aral Sea Basin based on in situ Measurements on Irrigated Farms”, Journal of Arid Land Studies,25,3,133-136, 2016/03, 有, 英語
  • Nguyen Toan Thang, Tran Van Do, Tamotsu Sato, Nguyen Trong Binh, Osamu Kozan, Ngo Van Cam, “Yield and Nutrient Content of Chestnut (Castanopsis piriformis) in Natural Central Highlands Forests, Vietnam”, Small-scale Forestry,15,2,229-239, 2016/01 有
  • Kok-Boon Neoh, Lee-Jin Bong, My Thi Nguyen, Vuong Tan Nguyen, Huy Quoc Nguyen, Masayuki Itoh, Osamu Kozan, Tsuyoshi Yoshimura, “Termite diversity and complexity in Vietnamese agroecosystems along a gradient of increasing disturbance”, 2015, Journal of Insect Conservation,19,6,1129-1139
  • M. F. Karim, M. Alam, Md. Rostom Ali, O. Kozan, “Design and Development of a Drum Seeder cum Granular Urea Applicator for Rural Farmers in Bangladesh”, 2015, Agricultural Engineering International
  • Tran Van Do, Tamotsu Sato, Satoshi Saito, Osamu Kozan Fine-root production and litterfall: main contributions to net primary production in an old-growth evergreen broad-leaved forest in southwestern Japan 2015, Ecological Research,30,5,921-930
  • Neoh, K.-B., Bong, L.- J. Muhammad, A. Itoh, M., Kozan.O, Takematsu, Y., Yoshimura, “Understanding the impact of fire on termites in degraded tropical peatlands and the mechanisms for their ecological success: current knowledge and research needs”, 2015
    Ecological Research,30,5,759-769
  • Tran Van Do, Tamotsu Sato, Satoshi Saito, Osamu Kozan, Hiromi Yamagawa, Dai Nagamatsu, Naoyuki Nishimura, Tohru Manabe, “Effects of micro-topographies on stand structure and tree species diversity in an old-growth evergreen broad-leaved forest, southwestern Japan”, 2015, Global Ecology and Conservation,4,185-196
  • Le Van Thanh, Tran Van Do , Nguyen Huy Son, Tamotsu Sato, Osamu Kozan, “Impacts of biological, chemical and mechanical treatments on sesquiterpene content in stems of planted Aquilaria crassna trees”, 2015, Agroforestry Systems,1-9

  • 「大規模開発下における熱帯泥炭湿地の水文過程解明と防火のための水・植生管理の検討」
    基盤研究(B), 甲山治, 2016 – 2018
  • ‘Investigation of hydrological process of tropical peat wetland and study on water and vegetation management for fire protection under large-scale development’, Grant-in-Aid for Scientific Research(B), Osamu Kozan, 2016 – 2018
  • 「泥炭火災適応策としての再湿地化と在来種植林による泥炭生態系の回復と住民の生計向上」, JICA草の根技術協力事業(草の根パートナー型), 甲山治, 2018 – 2021
  • ‘Restoration of Peatland Ecology and Livelihood Improvement through Rewetting and Revegetation toward the Prevention of Peat Fires’, JICA Partnership Program, Osamu Kozan, 2018 – 2021



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