WANG Zhong-Liang1, LI Jun1, LIU Cong-Qiang2, ZHU Zhao-Zhou1, LI Yong1
(1. Tianjin Key Laboratory of Water Environment and Resources, Tianjin Normal University, Tianjin 300387, China;
2. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China)
Abstract: Organic carbon, one of the important constituents and an effective environmental indicator in the terrestrial aquatic ecosystem, is an important link in the global carbon cycle. In the present study, the δ13C values of Particulate Organic Carbon (POC) and Dissolved Organic Carbon (DOC) in surface waters of the Tianjin District were measured to investigate their potential sources. The results showed that the δ13C values of POC range from –22‰ to –36‰, fully indicating that POC is derived from city sewage water and planktons. The δ13C values of DOC have an average value of –25‰, implying the overwhelming contribution of city sewage. Inspite of POC or DOC, organic carbon that is derived from soil erosion has only very limited contributions.
Key words: surface water; POC; DOC; potential source; δ13C
EARTH AND ENVIRONMENT Vol. 39, No.1, Tot No.283, 2011, Page 1-8
