SQ Wang;Yu Gr;QJ Zhao;Decao Niu;Chen Qm;ZF W

-Qiang1, YU Gui-Rui1, ZHAO Qian-Jun1, NIU Dong1, CHEN Qing-Mei1 and WU Zhi-Feng2 Institute of Geographic Sciences and Natural Resources Research, Beijing 1001

soc storage;cropland;soc content;in china;regions;dryland soil

The soil organic carbon (SOC) pool is the largest component of terrestrial carbon pools. With the construction of a geographically referenced database taken from the second national general soil survey materials and based on 1546 typical cropland soil profiles, the paddy field and dryland SOC storage among six regions of China were systematically quantified to characterize the spatial pattern of cropland SOC storage in China and to examine the relationship between mean annual temperature, precipitation, soil texture features and SOC content. In all regions, paddy soils had higher SOC storage than dryland soils, and cropland SOC content was the highest in Southwest China. Climate controlled the spatial distribution of SOC in both paddy and dryland soils, with SOC storage increasing with increasing precipitation and decreasing with increasing temperature.