新运粮河下游水质研究

新运粮河作为一条重要的入滇河流，其水质直接影响滇池的生态健康与环境安全。本文采用GB3838—2002《地表水环境质量标准》研究各理化因子对其水质的影响，在2011年8月底到10月底，对其具有代表性的河段进行水质监测。结果表明：新运粮河下游河段全年水质均为劣V类，是所有滇池入湖河流中污染较严重的河流，其各河段（监测点）污染程度不同，越往下游水污染越严重；各理化指标对其污染贡献不同，SS、CODcr、BOD5、TN对新运粮河的污染贡献率分别为36％、30％、12％、11％，SS、CODCr TN、BOD。为其主控污染因子。

Water Quality Research at the Lower Reach of New Yunliang River

As an important inflowing fiver into Lake Dianchi, the water quality of the New Yunliang River directly affects the ecological health and environmental safety of the lake. The Surface Water Environment Quality Standard （GB3838 -2002） was employed to investigate the physical and chemical factors which affected the water quality. From the end of August of 2011 till the end of October of the same year, the water quality of the representative fiver sections had been monitored. The results show that the water quality of the lower reach of the New Yunliang River was worse than Grade V throughout the year, being the most seriously polluted inflowing river. The further down a- long the river the worse is its quality. The main factors of SS, CODcr, BOD5 and TN had different contribution to the fiver pollution, that was respectively 36%, 30%, 12% and 11%.