大气干湿沉降对河北平原农田面源污染的贡献

Contribution of the atmospheric dry and wet deposition to the non-point source pollution in Hebei Plain, China

以河北平原大气干湿沉降为研究对象,通过干湿沉降输入的氮、磷输入量的计算,绘制空间分布图,评估了大气干湿沉降对河北平原面源污染的贡献,利用富集因子和主成分分析法探讨了氮素、磷素的来源。结果显示,河北平原大气干湿沉降对面源污染具有较大贡献。一年内输入土壤的氮素和磷素平均值分别达到30.22kg/hm^2和3.12kg/hm^2,空间分布上滨海平原输入量高于山前平原,其中沧州地区输入量最大。氮素、磷素的输入受到自然环境、工业结构等的影响。其中氮素主要受化工产业影响,磷素除了受化工排放影响外,还有磷肥施用的来源。

This study took the atmospheric dry and wet deposition of Hebei Plain as the research object,drew the spatial distribution map and evaluated the contribution of atmospheric deposition to the non-point source pollution of Hebei Plain,through the calculation of the input of nitrogen and phosphorus,and explored the sources of nitrogen and phosphorus by using the enrichment factors and principal component analysis.The result shows that the atmospheric dry and wet deposition contributed greatly to non-point source pollution in Hebei Plain.Within one year,the average values of nitrogen and phosphorus input into soil reached 30.22 kg/hm^2 and 3.12 kg/hm^2,respectively,and the spatial distribution of the input of the coastal plain was higher than that of the piedmont plain,in which the input of Cangzhou area was the largest.Nitrogen and phosphorus were affected by natural environment and industrial structure.Nitrogen was mainly affected by the chemical industry.In addition to chemical emissions,phosphorus was also the source of phosphate fertilizer application.