Long-term soil warming effect on soil organic carbon decomposition in Asian Monsoon forests

寺本 宗正*; Liang, N.*; 高木 健太郎*; 近藤 俊明*; 近藤 俊明*; 小嵐 淳; 安藤 麻里子; 高木 正博*; 石田 祐宣*; 楢本 正明*; et al.

no journal, , 

Soil respiration (Rs) consists of root respiration and heterotrophic respiration (Rh, decomposition of soil organic carbon by soil microbiota). Rh contributes to more than the half of Rs. Because Rh exponentially increases with temperature, it is concerned that increased Rh under future warmer environment might be further accelerate global warming (positive feedback). Therefore, long-term response of Rh to global warming is one of the most important elements for precise prediction for future climate change. Soil warming experiment in field is one of the effective methods to examine the long-term response of Rh against global warming. However, such long-term monitoring data under warmed environment is totally limited, especially in Asian monsoon region. To examine long-term response of Rh in Asian monsoon forest soil, we installed the same multi-channel automated chamber measurement system in typical forests in Asian monsoon region, and we conducted several years of soil warming experiments. In this presentation, we show the long-term response of Rh against artificial soil warming and control factors for the seasonal and inter-annual variation of the warming effect on Rh in those several forest ecosystems.