修河干流水质现状及变化趋势分析

Current situation analysis and changing trend for water quality of the trunk stream of Xiuhe River

本文利用单因子指数法及季节性Kendall趋势检验法分析修河干流2012年水质现状和2005~2012年的水质变化趋势。结果表明院修河干流现状水质总体较好，基本保持在域类水以上；趋势检验中，高锰酸盐指数呈下降趋势，而硝酸盐氮和氨氮均具有上升的趋势。

In this paper, the single factor index method and seasonal Kendall trend test analysis were used to analyzed the current situation of water quality in 2012 and the trend of water quality from 2005 to 2012 of Xiuhe River. The results showed that the water quality of Xiuhe River was in a generally good situation, basically remained above Class II; CODMn had decreased, while the NO3-N and NH3-N had increasing trends.