安徽淮北矿区地表水氮的富营养化特征及来源解析

为探索淮北临涣矿区地表水体中氮的分布和来源,采集研究区河流和沉陷积水区样品,测试分析其水化学指标和氮、氧同位素特征值,并采用IsoSource模型计算不同端源氮的污染贡献率。结果表明:研究区地表水处于中度富营养化状态,矿区地表水中氮的输入源受含氮肥料、土壤有机氮和粪肥污水共同影响,所发生的硝化及反硝化作用微弱;矿区河水中氮的主要输入源为粪肥污水,贡献率达66.6%,沉陷积水区氮主要受含氮肥料输入的影响,贡献率达52.0%。

Eutrophication Characteristics and Sources of Nitrogen in Surface Water in Huaibei Mining Area,Anhui

In order to explore the distribution and sources of nitrogen in the surface water of Linhuan mining area, the conventional chemical indexes, nitrogen and oxygen isotope values in the water samples collected from rivers and subsidence area in the study area were analyzed, and the contribution rates of nitrogen from different sources were calculated by IsoSource model. The results showed that the surface water was in a state of moderate eutrophication, the input source of nitrogen was affected by nitrogen containing fertilizers, soil organic nitrogen and manure sewage, the nitrification and denitrification were weak. The main input source of nitrogen in the rivers of the mining area was manure sewage with the contribution rate of 66.6%, and in the subsidence area, nitrogen was mainly affected by nitrogen containing fertilizer with the contribution rate of 52.0%.