supported by the Key Project of Chinese Ministry of Education (109151);the National Natural Science Foundation of China (40672121 and 40872111);the NSFC National Innovative Research Team Project (40721061)
Using -24‰ and -14‰ as the endpoints of stable carbon isotopic composition of total organic carbon (δ 13CTOC) of surface soil under pure C3 and C4 vegetation, and surface soil δ 13CTOC data from eastern China, Aus...