水生植被对湖滨湿地水环境净化效果及影响因素分析

目的]分析研究洪泽湖湖滨地区植物群落对湿地水环境的净化效果,为该区生态修复提供参考依据。方法]以洪泽湖湿地国家级自然保护区典型湖滨带为研究对象,通过对该区的水草区和无草区环境特征进行野外调查,并结合室内试验,测定湖泊湿地水体的营养盐(N和P)、化学需氧量(COD)及透明度(SD)含量的变化,定量分析水生植被在生长过程中对湖泊湿地生态系统中水环境的净化效果,并对其可能存在的影响因素进行探讨。结果]水生植被对洪泽湖湿地水环境中TN、TP、COD、Chla的去除作用及对SD含量变化有较明显的影响。水生植物之间的竞争可以抑制藻类的生长,减轻水体的富营养化情况。结论]该试验为研究洪泽湖湖滨带生态修复及增强其自净能力提供理论依据。

Effects of Aquatic Vegetations on Lake Wetland Water Environment Purification and Analysis of the Influencing Factors in Hongze Lake

Objective] To study the effect of plant community on wetland water environment purification in Hongze Lake,and to provide references to the ecological restoration of this area.Method] The typical lakeside zone of Hongze Lake Wetland National Nature Reserve was taken as the study area.Through the field survey based on environmental characteristics of aquatic areas and non-aquatic areas,combined with laboratory test,the content changes of nutrients(N and P),COD(chemical oxygen demand) and SD(transparency) levels in the water body of lake wetland were measured;the purification effect of the lake wetland ecosystem in the growth process of aquatic vegetation was quantitatively analyzed,and possible influencing factors were discussed.Result] Aquatic vegetation could remove the TN,TP,COD,Chla in wetland water environment and had obvious effects on the changes of SD content.Competition between aquatic plants can inhibit the growth of algae and relieve the eutrophication of water body.Conclusion] This study provided theoretical basis for ecological restoration and enhancement of self-purification capability in the lakeside zone of Hongze Lake.