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| Spatial and temporal distribution of dissolved organic carbon in Tuojia River watershed |
| Received:April 12, 2016 |
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| KeyWord:dissolved organic carbon;spatial and temporal distribution;influence factors;Tuojia River |
| Author Name | Affiliation | E-mail | | WU Hong-bao | College of Territorial Resources and Tourism, Anhui Normal University, Wuhu 241000, China
Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences/Key Laboratory of Agricultural Environment, Ministry of Agriculture, Beijing 100081, China | | | QIN Xiao-bo | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences/Key Laboratory of Agricultural Environment, Ministry of Agriculture, Beijing 100081, China | qinxiaobo@caas.cn | | LÜ Cheng-wen | College of Territorial Resources and Tourism, Anhui Normal University, Wuhu 241000, China | | | LI Yu-e | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences/Key Laboratory of Agricultural Environment, Ministry of Agriculture, Beijing 100081, China | | | LIAO Yu-lin | Soil and Fertilizer Initializer of Hunan Province, Changsha 410125, China | | | WAN Yun-fan | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences/Key Laboratory of Agricultural Environment, Ministry of Agriculture, Beijing 100081, China | | | GAO Qing-zhu | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences/Key Laboratory of Agricultural Environment, Ministry of Agriculture, Beijing 100081, China | | | LI Yong | Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Hunan 410125, China | |
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| Abstract: |
| To discover the characteristics of dissolved organic carbon(DOC) in water in small scale agricultural watershed and its relationship with the environment variables, a one-year's continuous survey(from December 2014 to November 2015) was conducted to observe the variation of DOC concentration and environmental factors in 4 different reaches of Tuojia River(S1, S2, S3 and S4) by the Gas Chromatography and high temperature catalytic oxidation method(HTCO). Results showed that the concentration of DOC ranged from 0.46 to 9.54 mg·L-1, with an average value of 3.09 mg·L-1 in the four reaches water of Tuojia River. Moreover, the spatial distribution of DOC concentration increased gradually from 1.36 to 4.25 mg·L-1 with the river levels(from S1 to S4), and the DOC concentration presented the significant differences among 4 reaches(P<0.01), which demonstrates that the exogenous contamination may lead to the variation of DOC concentration in different reaches. Additionally, the DOC has a positive correlation with the dissolved carbon dioxide(CO2) concentration, salinity, temperature, TDS and EC(P<0.01), while DOC concentration showed a negative correlation with the dissolved oxygen(P>0.05). The results of our study indicated that the intensity of different physical and chemical properties of water and exogenous contamination are the main reason for spatial and temporal variation of DOC concentration in Tuojia River. This research may provide important reference for further understanding and research on the source and control of DOC load in small agricultural watershed in subtropical China. |
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