乌梁素海表层底泥污染特征分析

Analysis of Characteristics of Contaminated Surface Sediments in Wuliangsuhai Lake

通过系统取样对乌梁素海表层底泥进行了理化性质分析,并利用MAPGIS软件,研究了表层底泥营养盐空间分布特征,并用底泥肥力评价了表层底泥中营养盐污染程度。结果表明,乌梁素海表层底泥中营养盐的空间分布特征呈现出北高南低,西高东低的差异,底泥中营养物质有机质、总氮和总磷存在明显的富集作用,与国内典型富营养化严重湖泊相比,处于中等水平;乌梁素海表层底泥有机指数相当高,除个别点外,其他区域都处于III级,肥污染状态。乌梁素海表层底泥中营养盐的相关性分析表明,有机质、总氮具有显著的同源相关性。总氮与上覆水总氮浓度相关性较为显著,而总磷与上覆水总磷浓度较为不显著,还有待于进一步研究。

The physical-chemical characteristics of surface sediments in Wuliangsuhai Lake were investigated,the spatial distribution characteristics of nutrients within surface sediment in Wuliangsuhai Lake were interpreted by using the MAPGIS software,and the pollution degree of surface sediment was appraised in this paper.The result indicated that the nutrient salt content was high in north and west and low in south and east.The total nitrogen,total phosphors and organic matter were obviously concentrated on the surface sediment.Compared to the typical seriously eutrophic lake,it is on the middle level.The organic index of the surface sediment was very high and the majority of areas except individual area were all belongs to III levels,namely serious pollution degree.The correlation analysis of nutrient substance of surface sediment showed that the total nitrogen and organic matter had obvious homologous relevance.The total nitrogen and total nitrogen concentration in the overlying water has more significant correlation,while the total phosphorus and total phosphorus concentration in the overlying water has less significant correlation.It requires further study.