2015年以来太湖总磷升高原因的研究

Research on the Cause of Total Phosphorus Increase in Tai Lake since 2015

对2015年以来的太湖TP变化趋势进行了研究,并对TP升高原因进行了分析。结果表明,2015—2019年,太湖TP浓度由0.059 mg/L上升至0.079 mg/L,涨幅34.1%。太湖TP上升的原因可能为:随入湖大量泥沙的带入而累积;东太湖水生植被覆盖面积急剧下降,使得湖体TP上升幅度明显;太湖磷营养盐浓度影响着蓝藻水华爆发的强度,蓝藻水华加快了湖体磷循环;夏季受台风天气影响,风浪较大的条件下造成底泥的再悬浮与释放而影响水质。

The change trend of total phosphorus(TP)in Taihu Lake since 2015 was studied,and the reasons for the increase of TP were analyzed.The results showed that from 2015 to 2019,the concentrations of TP in Taihu Lake rose from 0.059 mg/L to 0.079 mg/L,an increase of 34.1%.The reasons for the increase of TP in Taihu Lake could be the accumulation of sediment brought into the lake.The coverage areas of aquatic vegetation in East Taihu Lake decreased sharply,which resulted in the increase of TP in Lake Body.Phosphorus concentrations in Taihu Lake affected the intensity of cyanobacteria blooms,which accelerated the phosphorus cycle in the lake.And due to the influences of typhoon weather in summer,the re-suspension and release of sediment will affected the water quality.