2016—2019年山美水库氮磷分布特征

Nitrogen and phosphorus pollution characteristics ofShanmei Reservoir in 2016-2019

为了解近年来山美水库富营养化程度的变化趋势,基于2016—2019年山美水库进口、出口的总氮和总磷监测结果,分析了其时空分布特征,结果表明:(1)时间分布特征:山美水库近年来有富营养化趋势,2016-2019年进、出口总磷浓度在Ⅰ、Ⅱ类标准范围,总体呈上升趋势;2016-2018年进、出口总氮浓度呈上升趋势,2019年有明显下降,但均低于V类标准;2016-2019年进、出口总磷、总氮均表现为丰水期浓度较高。(2)空间分布特征:山美水库总磷进、出口年度趋势较为一致,进口浓度高于出口浓度,总氮亦表现出相似的趋势。

In order to understand the changing trend of the eutrophication degree of Shanmei Reservoir in recent years,based on the monitoring results of total nitrogen and total phosphorus at the import and export of Shanmei Reservoir from 2016 to 2019,the characteristics of its temporal and spatial distribution are analyzed,and the results show:( 1) Time distribution features: Shanmei Reservoir has a trend of eutrophication in recent years. In 2016-2019,the total phosphorus concentration at import and export is within the scope of Class Ⅰ and Ⅱ standards,and the overall level of total phosphorus concentration is increasing;the total nitrogen concentration at import and export in 2016-2018 shows an upward trend,there was a significant decrease in the year 2019,but they were all lower than the Class V standards;the total phosphorus and total nitrogen at import and export from2016 to 2019 showed higher concentrations during the wet season.(2) Spatial distribution characteristics: the annual trend of total phosphorus at import and export of Shanmei Reservoir is relatively consistent. The import concentration is higher than the export concentration,and the total nitrogen also shows a similar trend.