Advances in the turnover rate of soil organic carbon on a global scale.

Soil organic matter is one of the most important carbon reservoirs in terrestrial ecosystems, and small changes may affect the concentration of greenhouse gases in the Earth's system, which in turn affects the earth's surface temperature.
the estimation of soil organic carbon turnover rate has always been the focus and difficult problem of soil science research, especially how to choose a simple and effective parameter to indicate the turnover rate of soil organic carbon on a global scale has not been solved.
carbon isotope (13C) can indicate the source and flow of carbon in the soil.
study found that the soil carbon isotope value increased gradually with the increase of soil depth, while the soil carbon content decreased gradually.
this phenomenon is caused by the following reasons: First, the burning of fossil fuels caused by the gradual increase of carbon in the atmosphere, resulting in 13C depleted organic matter accumulated on the soil surface;
a large number of studies have concluded that microbial decomposition of soil organic carbon is the main cause of soil 13C with depth increase, and this trend can effectively indicate the soil carbon turnover rate.
Based on the above research, Wang Chao, assistant researcher of the Biogeochemistry Group of shenyang Institute of Applied Ecology of the Chinese Academy of Sciences, and his collaborators analyzed the changecharacteristics of carbon isotopes and carbon content in 27 soil profiles in northern China's grasslands, and collated 149 soil profile data at a depth of 1 m in the world. The reduction, the two showsignificant negative correlation, and proved that this negative correlation can well indicate the soil carbon turnover rate, (2) there is a significant positive correlation between the turnover rate of soil organic carbon on the global scale and the turnover rate of plant withering, and (3) the climate factor combined with soil physical and chemical properties can explain the change rate of soil organic carbon turnover well.
the results of this study provide research ideas for soil carbon turnover at regional and global scales, as well as new parameter data for biogeochemical models.
research by Stable isotopic constraints on global soil organic turnover carbon, published in Biogeosciences.
Wang Chao is the first author, and Bai Wei, a researcher at Shenyang Institute of Ecology, is the author of the newsletter.
research has been supported by the Youth 973 Project, the National Natural Science Foundation of China, the Key Research Project of Frontier Science of the Chinese Academy of Sciences and the Youth Innovation Promotion Association of the Chinese Academy of Sciences.
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