14条环太湖河流水质与茭草、水花生氮磷含量

选取环太湖14条主要河流为研究对象,分析河流水质和水生植物优势种(水花生和茭草)中氮磷含量,探讨两者的相关性。结果表明:自实施综合整治以来,环太湖河流水质有所好转,氮污染是目前环太湖河流的主要污染特征,有效削减其入河量是太湖入湖河流治理的重要任务;水花生总氮(TN)和总磷(TP)累积能力均强于茭草,水花生叶(茎)中TN、TP含量分别是33.88～55.70g·kg-(122.10～29.96g·kg-1)、4.44～8.96g·kg-(13.43～8.02g·kg-1);茭草叶(茎)中TN、TP含量分别是12.30～21.41g·kg-(121.75～31.22g·kg-1)、2.06～6.58g·kg-(12.60～7.81g·kg-1)。水花生和茭草叶茎中TN含量与水体中TN浓度均无显著相关性,但两种植物叶茎中TP含量与水体中TP浓度呈显著正相关,即在一定浓度范围内,水体中P浓度越高,水花生和茭草体内P的累积量越大。

Nitrogen and Phosphate Contents in Zizania caduciflora and A.philoxeroides(Mart.) Griseb and Water Qualities of 14 Rivers Around Taihu Lake, China

Total of 14 major rivers of Taihu Lake were investigated,the contents of nitrogen and phosphate in the rivers and advantage plants(Zizania caduciflora and A.philoxeroides(Mart.)Griseb)were analyzed,and the relations between them were also studied.The results showed that the water quality of rivers around Taihu Lake might be showing changes for better tendency,while the inflow river pollution was still severe.Reducing the amount of nitrogen into the river was most important.Accumulation of nitrogen and phosphorus in Zizania caduciflora was higher than that in A.philoxeroides(Mart.)Griseb,the contents of nitrogen and phosphorus in leaves(stems)of Zizania caduciflora were 33.88～55.70 g·kg-(122.10～29.96 g·kg-1)and 4.44～8.96 g·kg-(13.43～8.02 g·kg-1),for A.philoxeroides(Mart.)Griseb,the examined contents were 12.30～21.41 g·kg-(121.75～31.22 g·kg-1)and 2.06～6.58 g·kg-(12.60～7.81 g·kg-1)respectively.The contents of nitrogen in Zizania caduciflora and A.philoxeroides(Mart.)Griseb all had no significant correlation with nitrogen in rivers,however,the contents of phosphorus in two plants were positively related with the concentrations of phosphorus in rivers.i.e.,the higher phosphorus concentration in river water,the greater phosphorus accumulation in Zizania caduciflora and A.philoxeroides(Mart.)Griseb.