滇池现代沉积物氨氮及磁化率研究

现代沉积物是湖泊营养盐和污染物的重要储藏库,在一定条件下,这些内源污染负荷可能成为水体富营养化的主导因子.研究通过对滇池（外海）现代沉积物中的氨氮、磁化率指标进行测试分析,研究结果表明：滇池现代沉积物中氨氮的高值区主要分布在北部海埂附近,中部略有增高,南部则最低,表层沉积物的氨氮含量低于下层;滇池现代沉积物的磁化率大小由滨岸带向湖心依次递减,在垂向上,磁化率随着深度的增加而增大.研究结果可为滇池污染治理提供了依据.

Study on the Distribution Features of Ammoniac Nitrogen and Magnetic Susceptibility in Modern Sediment of Dianchi Lake

The modern sediment is an important storehouse of the nutrient salt and pollutant in Lakes.Under proper conditions,these internal contamination load sources can cause the eutrophication of lakes.Based on the study on the distribution features of the ammoniac nitrogen and magnetic susceptibility in modern sediment of Dianchi Lake,it is concluded that the high value area of ammoniac and nitrogen distributes in the northern part nearly Haigeng district,the value of ammoniac and nitrogen increases slightly from the northern part to the middle part and the most lower value is near the southern part.The ammoniac nitrogen of the surface sediment is lower than tie below layers;and the magnetic susceptibility of modern sediment decreases gradually from the edge to the middle of the Dianchi lake,increases along with the degree of depth.Help is given for bringing the polluted water of Dianchi Lake under control.