“十二五”期间贵州省地表水水质变化趋势分析

Water quality change trend analysis of surface water in Guizhou Province during The "Twelfth Five-Year Plan Period"

根据贵州省"十二五"期间地表水监测数据,分析五年来贵州省两大流域和七大水系水质的变化趋势,表明"十二五"期间,贵州省地表水环境污染段主要集中在长江流域的乌江水系的乌江段和沅水水系的清水江支流(重安江段);珠江流域水体以优为主。全省地表水大部分河段都能满足水质功能要求的水质类别,总体水质呈上升趋势,赤水河水系、红水河水系、北盘江水系和柳江水系水质均保持稳定,且水体水质为优;乌江水系水体水质总体呈上升趋势,沅水水系水体水质总体稳定。

According to surface water monitoring data in Guizhou Province during the period of 'twelfth five- year'. Analysis on water quality change trend of two river basin and seven major river systems in Guizhou during five years was carried out. The results show that surface water pollution in Guizhou mainly take place in Wujiang River section of Wujiang River water system and Qingshuijiang River( Chonganjiang River section),one of the tributaries of Yuanjiang River water system,while water quality of Pearl river basin is basically in ' best' class according to water quality classification in China. Most of surface water quality in Guizhou Province can meet the functional requirements of water quality classification. The overall water quality is on the rise. The water quality of Chishui River,Hongshuihe River,Beipanjiang River and Liujiang River water systems remain stable with water quality in ' best ' class. Water quality in Wujiang River water system is incrementally improving while that in Yuanjiang River water system remained stable.