2016-2020年淀山湖总磷的时空变化特征及成因分析

Temporal and Spatial Variation Characteristics and Cause Analysis of Total Phosphorus in Dianshan Lake from 2016-2020

本文分析了2016-2020年淀山湖总磷及磷酸盐的年度变化、季节变化和空间分布特征,同时分析了总磷及磷酸盐与其他环境要素的相关性。结果表明受上游来水和沉水植物的影响,淀山湖近五年总磷呈现波动下降的年变化趋势;季节变化整体呈现冬春低,夏秋高的趋势,每年6月份开始上升,8月或9月出现浓度最高值,10月份后开始下降;受上游来水和流场的影响,空间上呈现北高南低、西高东低的分布特征。

This paper analyzes the annual,seasonal and spatial distribution characteristics of total phosphorus and phosphate in Dianshan Lake from 2016 to 2020,and analyzes the correlation between total phosphorus and phosphate and other environmental factors.The results showed that the total phosphorus in Dianshan Lake showed a fluctuating downward trend in the past five years due to the influence of upstream runoff and submerged plants;The seasonal variation shows a trend of low in winter and spring and high in summer and autumn.It starts to rise in June every year,and the maximum concentration appears in August or September,and starts to decline after October.Affected by the upstream inflow and flow field,it showed the distribution characteristics of high in the north and low in the south,high in the West and low in the East.