玄武湖水生植物调查及影响因素

Aquatic Plants Investigation of Xuanwu Lake and Its Influence Factors

以玄武湖为调查对象,分析了湖泊近年来水质、富营养化及底泥污染状况,调查了水生植物种类及应用频度,水生植物群落数量特征、景观特征及多样性与结构特征,探讨了影响水生植物生长的因素。结果表明,玄武湖中应用的水生植物共47种,分别隶属于32科。其中挺水植物7种,浮水植物5种,沉水植物3种,湿生植物32种。玄武湖水生植物数量及群落结构与DO、COD、氨氮等水质指标相关性较大,随着近年来水质的不断改善,玄武湖的水生植物种类和数量总体上呈增长趋势。与南京城区其他湖泊相比,玄武湖水体水生植物群落的物种相对丰富,分布也相对均匀。但是,水花生等外来入侵物种的增加、荷花等物种的大量人为种植,都会影响玄武湖水生植物群落的多样性特征。

A survey was performed to analyse the water quality,eutrophication and sediment pollution of the lake body,to study the species and application frequency of aquatic plants,as well as quantitative characteristics,landscape and diversity features in Xuanwu Lake,to discuss the factors influencing the growth of the aquatic plants.The result showed,a total of 47 species of aquatic plants belonging to 32 families were applied in Xuanwu Lake,which included 7 species of emergent plants,5 species of floating plants,3 species of submerged plants,and 32 species of hygrophytes.The quantity and community structure of aquatic plants significantly correlated with water quality factors such as DO,COD and NH 3-N.With the continuous improvement of water quality in recent years,the species and quantity of aquatic plants in Xuanwu Lake were increasing.Compared with other lakes in Nanjing City,the aquatic plants community of Xuanwu Lake was abundant and well-distributed relatively.However,the increase of invasive species such as alligator weed,as well as the artificial planting of lotus,will affect the diversity of aquatic plant communities in Xuanwu Lake.