基于正定矩阵分解的傍河水源地土壤重金属污染源分析

以宁夏吴忠市金积傍河水源地为研究对象,在综合分析水源地区内土壤介质特征基础上,在水源地区域范围内采集了15个土壤样品,分析了区域范围内土壤重金属砷、镉、铬、铜、铅、镍、锰等7个因子空间分布状况,采用正定矩阵分析方法定性识别土壤重金属来源及各项来源空间污染贡献率。结果显示,金积水源地土壤重金属含量均未超过国家土壤环境二级标准,低于区域土壤背景值,其中土壤重金属污染受自然来源总贡献率为34.1%,受工业污染影响来源贡献率26.2%,受农业污染影响来源贡献率21.1%,受畜禽养殖粪便堆放及施肥作用影响的贡献率为18.6%。污染来源及其污染贡献程度分析结果为水源地供水安全和环境保护提供了重要的科学依据。

Sources Apportionment of Soil Pollution of Heavy Metals in Riverside Water Source Field based on Positive Matrix Factorization Method

As the study objectives, Jinji riverside water sources field in Wuzhong City was selected to study the pollution characteristics and spatial variation of heavy metals in soil. Based on characteristics of soil, 15 soil samples were collected and analyzed for heavy metals including arsenic, cadmium, chromium, copper, lead, nickel, and manganese. Spatial distribution and sources apportionment of soil pollution of each heavy metal were analyzed by positive matrix factorization method. Results show that the contents of heavy metals of all samples have not exceeded regional soil background value and the national secondary standard of soil environment in the area. Heavy metals in the soil under the natural source of the total contribution rate is 34.1%, from which, 26.2% is contribution of industrial pollution, 21.1% is contribution of regional agricultural pollution, and 18.6% is contribution of livestock and poultry feces piled and fertilization effects. Pollution sources apportionment and pollution contribution degree analysis results could provide important scientific basis for water supply security and environmental protection of water source field.