Bian Jin-yun, Wang Fei-er, Yang Jia, Yu Jie, Lou Li-ping, Yu Dan-ping
College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China.
Huan Jing Ke Xue. 2012 Aug;33(8):2659-66.
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 with FFP, the reduction of SSNM in dissolved nitrogen (DN), particle nitrogen (PN), dissolved phosphorus (DP) and particle phosphorus (PP) was 8.17%, 4.33%, 9.08% and 1.02%, respectively.
本研究利用年度农业非点源模型（AnnAGNPS）模拟了苕溪流域泗安水库流域氮、磷的输出负荷，并结合模拟结果分析了流域非点源污染的空间分布特征。结果表明，氮、磷的输出负荷具有相似特征：在研究区域内，养分输出负荷在南部和西部地区较高，在北部和东部地区较低。以竹林为主的林地是氮、磷负荷的主要输出源，其贡献率占全流域养分负荷的90%以上。情景分析采用了三种施肥方式，即不施肥（CK）、精准养分管理（SSNM）和农民施肥习惯（FFP）。情景分析表明，SSNM在一定程度上可以减少氮、磷流失。与FFP相比，SSNM在溶解态氮（DN）、颗粒态氮（PN）、溶解态磷（DP）和颗粒态磷（PP）方面的减少量分别为8.17%、4.33%、9.08%和1.02%。
