金沙江流域-丽江段水环境质量时空变化趋势及保护思路

Temporal and Spatial Variation Trend and Protection Ideas of Water Environment Quality in the Jinsha River Basin,Lijiang

通过金沙江丽江段干流断面和一级支流水质情况,结合内梅罗污染指数法和Spearman秩相关系数法分析了2011-2020年金沙江流域丽江段水质情况及变化趋势,阐述了2019年和2020年金沙江丽江段流域水质空间分布、月变化情况,提出了流域水质污染防治建议。结果表明,金沙江流域丽江段2011-2020年金沙江流域丽江段水质有变好趋势,2019年金沙江丽江段水质自上游至下游有变好趋势,但其变化趋势不显著,2020年金沙江丽江段水质自上游至下游几乎无变化,金沙江干流水质2020年3月、8月和12月较上月明显上升,水质变差,4-7月和9-11月呈下降趋势,水质有所好转。丽江段金沙江各干流断面水质与上游干流断面水质均无显著性相关。

The water quality and change trend of the Jinsha River Basin in Lijiang from 2011 to 2020 were analyzed using Nemero pollution index method and Spearman rank correlation coefficient method.The spatial distribution and monthly change of water quality were presented.Some suggestions on water pollution prevention and control were put forward.The results showed that from 2011 to 2020,the water quality of Lijiang section of the Jinsha River Basin has a trend of improvement.In 2019,the water quality of Lijiang section has a trend of improvement from upstream to downstream,but the change trend was not significant.In 2020,the water quality of Lijiang section has almost no change from upstream to downstream.The water quality of the river in March,August and December of 2020 was significantly higher than that of the previous month.However,the water quality became worse,showing a downward trend from April to July and September to November,and the water quality improved.The water quality was no significant correlation between the upstream section and the downstream section.