Establishing reference nutrient conditions for upper reaches of Guanting Reservoir
CHENG Peng1,2, LI Xu-yong2, SUN Ming-dong3, WANG Yue-feng4
1. College of Resources and Environment, Shanxi University of Finance and Economics, Taiyuan 030006, China; 2. State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environment Science, Chinese Academy of Sciences, Beijing 100085, China; 3. Institute of Water Environment Science, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; 4. Hebei Research Academy of Environmental Sciences, Shijiazhuang 050018, China
Abstract：The reference river percentage method, general river percentage method, and multivariate linear regression method were used to establish the reference conditions of river nutrients in the upper reaches of Guanting Reservoir in the rainy season and dry season. The seasonal impact of monsoon climate on the nutrients reference conditions was also discussed. In addition, main human activities impacting nutrient concentrations in upstream of the reservoir were identified. The results revealed that the total nitrogen and total phosphorus concentrations of reference river points and general river points showed significant seasonal differences in rainy and dry seasons. The nutrient reference conditions established with the reference river percentage method, general river percentage method, and multiple linear regression method had seasonal differences in the rainy and dry seasons. The average of the three methods was taken as the nutrient reference conditions in the upper reaches of the Guanting Reservoir. The recommended values of the TN reference conditions in the rainy and dry seasons were 1.580 and 1.672mg/L, respectively; the recommended values of the reference conditions of TP in the rainy and dry seasons were 0.075 and 0.055mg/L, respectively. Ranked by nutrients contribution, human activities that affect the TN concentration of rivers were in order of pollution load intensity of livestock and poultry farming, proportion of cultivated land with slope degree of 0 to 8, and proportion of urban land. For TP concentration, the order of human activities was the proportion of cultivated land with slope degree of 0 to 8, and the pollution load intensity of livestock and poultry farming.
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