Soil labile organic carbon in different types of moso bamboo (Phyllostachys edulis) stands

Taking the Phyllostachys edulis forest, P. edulis and broadleaved mixed forest, and P. edulis and Cunninghamia lanceolata mixed forest in Anfu County, Jiangxi Province of China as test objects, this paper studied the variations of soil labile organic carbon in different types of moso bamboo stands. The contents of soil total organic carbon (TOC) and readily oxidizable carbon (ROC) were the highest in P. edulis forest (13.1 and 2.15 g·kg-1, respectively), while the soil microbial biomass carbon (MBC) and hot water-extractable carbon (HWC) were the highest in P. edulis and C. lanceolata mixed forest (123.3 and 349.0 mg·kg-1, respectively). The soil labile organic carbon contents in the three types of moso bamboo stands all decreased with soil depth, indicating that surface soil layer could significantly enrich soil labile organic carbon. The soil TOC, MBC, HWC, and ROC contents were significantly correlated with each other (P0.01), and the MBC, HWC, and ROC could be used to evaluate the contents of soil active labile organic carbon.