Labile Organic Carbon in Eroded Soil under Different Vegetation in Northwest of Liaoning Province, China

Soil total organic carbon (TOC), light fraction organic carbon (LFOC), hot-water extractable carbon (HWC), cold- water extractable carbon (CWC) and microbial biomass carbon (MBC) were determined in eroded brown soils under three vegetation in a water and soil conservation monitoring station in northwest of Liaoning province. The results showed that the TOC-C content in young pine soil is 4.49 g kg^-1, as much as 2.09 and 2.38 times in non-tillage maize soil and natural weed soils, respectively. The ration of LFOC to TOC in natural weed soil was maximal in three vegetation soil. The content of HWC, CWC, and MBC changed synchronously with TOC content, and their content in three vegetation soil in order was natural weed>non-tillage maize>young pine. HWC correlated significantly linear to TOC. The content of HWC was as much as 2.67 and 2.44 times for CWC and MBC, respectively. The results indicated that the species and content of organic carbon in eroded soil changed with the vegetation type, therefore suitable vegetation should be chosen to conserve and recover soil fertility in soil anti-eroded measures.