东昌湖水体富营养化评价及N、P平衡研究

通过对东昌湖2005年水质监测数据的分析，采用卡尔森指数法对东昌湖水体的富营养化水平进行了评价，发现东昌湖水体处于中-富营养化水平。对东昌湖水体富营养化的主要影响因子N、P的平衡研究结果表明：东昌湖N输入量为7．35t,／a，P输入量为1．47t/a，主要来源于随外界输水进入；N和P输出量分别为6．44t／a和0．88t／a，截留率分别为12．4％和39．9％。根据东昌湖N、P平衡，建议采用生物控制模式防止东昌湖水体富营养化的加剧。

Assessment of Eutrophication and Balance of N and P in Dongchang Lake

Based on the analysis of the water quality monitoring data of Dongchang Lake in 2005, the eutrophication level of the water body was evaluated by using Carlson model. The result showed that the water body of Dongchang Lake had become eutrophication. The study on the balance of N and P indicated that the total input amount of N and P was 7. 35 t/a and 1.47 t/a, which were mainly from the upper - stream; the outputs of N and P were 6.44 t/a and 0. 88 t/a, suggesting that the rates of retained N and P reached to 12. 4% and 39.9% respectively. According to the balance of N and P in Dongchang Lake, It was proposed to use biological control mode to prevent the aggravation of eutrophication of Dongchang Lake.