2017 - 2020 Kaya fields as an agricultural resource: Towards the Sustainable Use of Kaya fields
2016 - 2019 Effects of dissolved organic carbon (DOC) flux on the soil carbon cycling and microbiacl community in forest ecosystems.
2015 - 2019 The clarification of environmental response characteristics and variation mechanism of ecosystem function in deciduous broadleaf forests with vegetation succession
2015 - 2018 Dynamics of soil organic carbon in a mangrove forest on an estuary of Trat River, eastern Thailand
2015 - 2017 Missing carbon from mangrove forests through tidal exchange
2014 - 2017 Observation for evaluation of soil organic carbon decomposition and response of carbon dynamics in the Arctic terrestrial ecosystem to permafrost thaw.
2012 - 2015 Soil organic carbon pools and dynamics in a mangrove forest
2010 - 2014 Development of validation method for the scaling up of carbon flux simulation using ecological process models
2009 - 2012 A missing sink in forest ecosystems, the effect of dwarf bamboo understory on soil carbon sequestration
2008 - 2011 森林・草原生態系の群落構造と相互作用機構およびその時間変動性の解明
2008 - 2011 Long-term change and future prediction of the carbon sequestration in an Arctic terrestrial ecosystem following rapid glacier retreat
2007 - 2010 Long-term durability of carbon sequestration in terrestrial ecosystems
2007 - 2009 森林ネクロマスの動態-メソ時間スケール現象の研究手法の開発-
2006 - 2008 Radiocarbon-based turnover time and sequestration of soil organic carbon in a cool-temperate deciduous forest
2003 - 2006 Evaluation of soil carbon sequestration in a small basin ecosystem
2003 - 2006 Ecological study of the factors controlling spatial and temporal variations of carbon cycle in a High Arctic terrestrial ecosystem
2003 - 2004 Development of the forest growth estimation technique by remote sensing
2002 - 2003 Estimation of annual carbon budget of forest ecoxyxtems at meso-scale.
1997 - 1998 Comparative Ecological Study on Subtropical Forest in Canary
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Papers (94):
Toshiyuki Ohtsuka, Suthathip Umnouysin, Vilanee Suchewaboripont, Nada Yimatsa, Chadtip Rodtassana, Morimaru Kida, Yasuo Iimura, Shinpei Yoshitake, Nobuhide Fujitake, Sasitorn Poungparn. Biomass recovery of coastal young mangrove plantations in Central Thailand. Scientific Reports. 2024. 14. 1
Ruoming Cao, Siyu Chen, Shinpei Yoshitake, Takeo Onishi, Yasuo Iimura, Toshiyuki Ohtsuka. The Nitrogen Cycle of a Cool-Temperate Deciduous Broad-Leaved Forest. Forests. 2024
Natsumi Yasuki, Wakana Saso, Hiroshi Koizumi, Yasuo Iimura, Toshiyuki Ohtsuka, Shinpei Yoshitake. Decrease in Inorganic Nitrogen and Net Nitrogen Transformation Rates with Biochar Application in a Warm-Temperate Broadleaved Forest. Forests. 2024
Kota Hamada, Toshiyuki Ohtsuka, Nobuhide Fujitake, Toshihiro Miyajima, Yusuke Yokoyama, Yosuke Miyairi, Morimaru Kida. Functional organic matter components in mangrove soils revealed by density fractionation. Soil Science and Plant Nutrition. 2024. 70. 2. 88-99
Siyu Chen, Ruoming Cao, Shinpei Yoshitake, Toshiyuki Ohtsuka. Canopy Phenology and Meteorology Shape the Seasonal Dynamics in Hydrological Fluxes of Dissolved Organic Carbon in an Evergreen Broadleaved Subtropical Forest in Central Japan. Forests. 2023