Simulation of nitrogen and phosphorus loss in Siling Reservoir watershed with AnnAGNPS

By using annual agricultural non-point source model (AnnAGNPS), this study simulated the export loading of nitrogen and phosphorus in Siling Reservoir watershed in Tiaoxi Basin, and integrated with the simulation results, the spatial distribution characteristics of non-point source pollution in the...

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Bibliographic Details
Published inHuanjing kexue Vol. 33; no. 8; p. 2659
Main Authors Bian, Jin-yun, Wang, Fei-er, Yang, Jia, Yu, Jie, Lou, Li-ping, Yu, Dan-ping
Format Journal Article
LanguageChinese
Published China 01.08.2012
Subjects
Animals
China
Computer Simulation
Crops, Agricultural - growth & development
Environmental Monitoring
Livestock
Models, Theoretical
Nitrogen - analysis
Phosphorus - analysis
Rivers
Water Pollutants, Chemical - analysis
Water Supply
China
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Summary:By using annual agricultural non-point source model (AnnAGNPS), this study simulated the export loading of nitrogen and phosphorus in Siling Reservoir watershed in Tiaoxi Basin, and integrated with the simulation results, the spatial distribution characteristics of non-point source pollution in the watershed was analyzed. The result showed that the export loading of nitrogen and phosphorus had similar characteristics: in the study area, the export loading of nutrients were higher in southern and western regions and lower in northern and eastern regions. Forest land mainly made up of bamboo was the main export source of nitrogen and phosphorus loading with the contribution above 90% of nutrient load of whole watershed. Three fertilization practices such as no fertilizer (CK), site-specific nutrient management (SSNM) and farmers' fertilizaction practice (FFP) were used in the scenario analysis. The scenario analysis showed that to a certain degree, SSNM could reduce the nitrogen and phosphorus loss. Comparing w
ISSN:0250-3301