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7364701 
Journal Article 
官厅水库上游河流营养物参照状态的制定 
Cheng, P; Li, XY; Sun, MD; Wang, YF 
2020 
1 
Zhongguo Huanjing Kexue / China Environmental Science
ISSN: 1000-6923 
Chinese Society for Environmental Sciences 
40 
8 
3662-3671 
Chinese 
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. © 2020, Editorial Board of China Environmental Science. All right reserved. 
Guanting Reservoir; Nutrients; Reference conditions; Rivers; Seasonality; Agriculture; Drought; Land use; Linear regression; Nutrients; Rivers; Textile blends; Guanting reservoir; Multiple linear regression method; Multivariate linear regressions; Nutrient concentrations; Nutrient conditions; Recommended values; Reference condition; Seasonal differences; River pollution