洱海总磷、总氮污染现状分析

Analysis on Total Phosphorus and Total Nitrogen Pollution in Erhai Lake

根据2004年洱海水质的实测数据,对洱海总磷、总氮污染现状进行了分析评价:洱海全湖多数测点和断面的总磷、总氮平均浓度都不超出Ⅲ类水质标准,但其水体中氮磷浓度已处于较高水平,洱海实际上正步入由中营养向富营养化转化的关键期;对洱海氮磷的来源作了简要分析,并针对实际情况提出污染防治措施。

This paper presents a comprehensive analysis on the total phosphorus （TP） and total nitrogen （TN） condition in Erhai lake based on recent monitoring data. As indicated by the data collected in 2004, although the average TP and TN concentrations at most monitoring stations and cross - sections ：in the lake are lower than the target concentrations of Grade Ⅲ water quality standard, the relatively high nutrient concentrations in the lake does evidence that the lake is experiencing a transition from the mesotrophic to eutrophic condition. The paper then provides further analysis of the sources of TP and TN, and proposes pollution control countermeasures based on the water quality and source analysis.