滹沱河流域忻州段地表水功能区水质变化趋势分析

根据忻州市水资源公报2004—2011年的水质资料，对有监测资料的4个水功能区水质进行分析，分别就各水功能区水质类别、达标河长比率、污染物含量变化进行分析。结果显示：2004—2011年各水功能区水质类别有明显改善，达标河长比率上升趋势明显，但达标河长比率仍然偏低，2010年最高也仅为50％。通过主成份分析选取了 COD 、NH3－ N 为水区功区水体污染的主要因子。8年间各水功能区 COD 、NH3－ N 含量下降趋势明显，且各功能区表现出明显差异性，需要在区域水环境中进行针对性治理。

Trend analysis of the water quality change in surface water functional zone of Xinzhou in Hutuo river basin

According to the water quality information of Xinzhou Water Resources Bulletin from 2004 to 2011, analyzed the water quality as the water quality category, the river length ratio of water quality reached the standard and the change of contaminants content in 4 water functional zones, respectively. The results showed that: The water quality category in each water function zone had significantly improved in 2004 to 2011. The river length ratio of water quality reached the standard had obviously risen, but the river length ratio of water quality reached the standard was lower. In 2010, the maximal ratio was still only 50%. Through the principal component analysis, we selected COD and NH₃-N as the main factors for the water pollution in water functional zones. The COD and NH₃-N contents in each water functional zone had obviously declined during the 8 years. Also the difference was obvious in each functional zone. So it was necessary to carry out the pertinence government in the regional water environment.