摘要
湿地植物是湿地生态系统中不可或缺的组成部分.为研究湿地植物与水体营养状态影响关系,以鄱阳湖的泥湖、常湖、赣江南支、大莲子湖、白沙湖、战备湖、朱市湖、常湖池和大湖池等 9 个碟形湖为研究区域,选取鄱阳湖湿地的优势种苔草为研究对象,碟形湖水环境因子为主要环境控制因子,通过主成分分析和多元回归分析,确定水环境因子对苔草生物量和植株密度贡献值.结果表明:(1)大湖池和朱市湖是中营养状态,其他碟形湖是轻度富营养状态,鄱阳湖西部区域的碟形湖水质状态要好于南部和东部区域碟形湖的水质状态.(2)主成分分析表明,影响苔草群落特征的关键因子是 NO3-N、PO4-P、NH4-N、TN、COD、TP.(3)NH4-N和 pH与苔草密度呈极显著(P＜0.01)正相关,能够解释 82%的苔草植株密度.营养状态指数与苔草地上生物量呈显著相关(P＜0.05),能够解释 75.9%的苔草地上部分生物量.
Abstract
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).
基金项目
江西省重点研发计划项目(20192BBHL80003)
江西省水利厅科技项目(202022YBKT17)
维普
万方数据