title: [Soil organic carbon variation of de-farming and wasteland during alteration of ecosystem in Billabong].
abstract: Four soil profile samples were collected in the middle of de-farming and wasteland billabong and around slopes, located at typical karst district of Guizhou province. Soil organic matter (SOC) content and delta Corg, were determined. SOC content ranged from 6.0 mg x kg(-1) to 92.3 mg x kg(-1), and decreased with depth at slope soil profiles. The range of value was bigger than that at billabong soil profile (6.3-26.7 mg x kg(-1)). The value of detla13 Corg, at slope profiles was between - 25.103% per hundred and - 23.666% per hundred, but variation direction of three slope soil profiles was different. The value of delta 13Corg, in billabong soil profile was between - 23.495% per hundred and - 20.809% per hundred, and increased with depth. The correlation between delta13 Csoc and C4-C,C3-C was significant (R = 0.884, n=7), influenced by new C3-C.
authors.affiliation: State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China. chenglongtu@163.com
authors.forename: Cheng-long
authors.initials: CL
authors.lastname: Tu
authors.forename: Cong-qiang
authors.initials: CQ
authors.lastname: Liu
authors.forename: Yong-feng
authors.initials: YF
authors.lastname: Wu
mesh_terms: D000383:Agriculture; D002244:Carbon / Q000032:analysis*; D002247:Carbon Isotopes; D002681:China; D017753:Ecosystem; D004784:Environmental Monitoring; D009930:Organic Chemicals / Q000032:analysis*; D012987:Soil / Q000032:analysis*
chemical_list: D002247:Carbon Isotopes; D009930:Organic Chemicals; D012987:Soil; D002244:Carbon