水生植物对剑湖湿地水体N，P营养空间分异的影响

IMPACTS OF HYDROPHYTES ON SPATIAL DISTRIBUTION OF WATER NUTRIENTS OF NITROGEN AND PHOSPHORUS IN JIANHU WETLAND

为探究水生植物对剑湖湿地水体N，P营养空间分异的影响，运用野外采样及室内分析方法，分析了剑湖湿地水生植物资源、湿地水体N，P营养状况以及湿地水体N，P营养物质空间异质性，讨论了水生植物对湿地水体N，P营养水平空间分异的影响。结果表明，剑湖湿地具有丰富的水生植物资源，水体N，P营养物质受到水生植物群落的影响表现出空间强变异性；湖滨带挺水植物和湖体沉水植物对水体N，P营养物质的吸收利用程度较高，湖滨带迎水面水体TN和TP含量分别是0．583、0．119mg／L，而在其背水面水域则为0．411、0．043mg／L；从永丰河入湖处水体TN和TP含量高达14．097、1．628mg／L，降至出水口的TN和TP含量为0．321、0．022mg／L，水质得到极大改善，可见水生植物对剑湖湿地水体N，P营养的空间分异具有重要的影响，对剑湖湿地生态系统发挥其特殊的生态功能有着重要的作用。

Based on field investigation and laboratory analysis, hydrophytes, water nutrients of nitrogen and phosphorus,and the spatial variety of water nutrients of nitrogen and phosphorus in Jianhu wetland were analyzed,and also the impacts of hydrophytes on spatial distribution of water nutrients of nitrogen and phosphorus were discussed. The results showed that hydrophytes were rich and water nutrients of nitrogen and phosphorus presented a strong variability influenced by the wetland hydrophytes community in Jianhu wetland, Emerged plants influenced the distribution of water nutrients in the lakeshore and submerged plants in the lake and absorbed water nutrients greatly--total nitrogen （TN） and total phosphorus （TP） concentration of inflow water were 14. 097 mg/L and 1. 628 mg/L,but they were just 0, 321 mg/L and 0.022 mg/I. in outflow water in Jianhu wetland. It can be found that water quality was greatly improved.so the hydrophytes played an important role on spatial distribution of water nutrients of nitrogen and phosphorus and could make wetland ecosystem perform its own function.