title: Tracing the source of Beijing soil organic carbon: a carbon isotope approach.
abstract: Bulk soil organic carbon concentration and isotopic composition characterize its sources and fate, identify the anthropogenic input of organic carbon into the soil, and trace soil carbon turnover. Coal and/or coal combustion products represent the prime anthropogenic input of organic carbon into three soil profiles located in the vicinity of a steel company. Three profiles positioned away from any direct industrial contribution display vertical pattern in soil organic carbon concentration and isotopic composition that resemble more commonly observed downward gradients in soil carbon chemistry and indicate microbial soil carbon turnover. Two additional profiles located outside of the immediate industrial area display vertical carbon isotope profiles between typical of those from industrial and non-industrial areas. Eight soil profiles and their vertical distribution of bulk organic carbon isotopic composition and concentration collected in the Beijing area reveal and distinguish both anthropogenic and natural contributions of carbon to these soils.
authors: Center for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China. guoqj@igsnrr.ac.cn
authors: Qingjun
authors: Q
authors: Guo
authors: Harald
authors: H
authors: Strauss
authors: Tong-Bin
authors: TB
authors: Chen
authors: Guangxu
authors: G
authors: Zhu
authors: Jun
authors: J
authors: Yang
authors: Junxing
authors: J
authors: Yang
authors: Mei
authors: M
authors: Lei
authors: Xiaoyong
authors: X
authors: Zhou
authors: Marc
authors: M
authors: Peters
authors: Yunfeng
authors: Y
authors: Xie
authors: Hanzhi
authors: H
authors: Zhang
authors: Rongfei
authors: R
authors: Wei
authors: Chunyu
authors: C
authors: Wang
mesh_terms: D002244:Carbon / Q000032:analysis*; D002247:Carbon Isotopes / Q000032:analysis; D003031:Coal; D004784:Environmental Monitoring / Q000379:methods*; D008669:Metallurgy; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis*
chemical_list: D002247:Carbon Isotopes; D003031:Coal; D012987:Soil; D012989:Soil Pollutants; D002244:Carbon