Study on the influence of nutritional status of disc lake on Carex
Wetland plant is an indispensable part of the wetland ecosystem.To study the relationship between wetland plants and the nutritional status of lake water,nine disc lakes in Lake Poyang,Ni Lake,Chang Lake,southern branch of gan river,Dalianzi Lake,Baisha Lake,Zhanbei Lake,Zhushi Lake,Changhuchi Lake and Dahuchi Lake,were selected as the research sites in this study.The dominant species of Sedge in Poyang Lake wetland was selected as the research object,and the water environmental factors in disc lakes were selected as the main environmental control factors.The contribution values of water environmental factors to the biomass and plant density of Sedge were determined by principal component analysis and multiple regression.The results showed that:(1)Dahu Lake and Zhushi Lake were in the mesotrophic state,and other disc lakes were in the light eutrophic state.The water quality of the disc-shaped lake in the western region of Poyang Lake was better than that in the southern and eastern regions.(2)Principal component analysis showed that NO3-N,PO4-P,NH4-N,TN,COD and TP were the key factors affecting the vegetation characteristics of Carex.(3)NH4-N and pH were significantly correlated with the density of Sedge(P＜0.01).Nutrient status index of dish lake was significantly correlated with biomass on bolting grassland(P＜0.05).
lake eutrophicationwetland plantsprincipal component analysismultiple regression
万方数据
维普
