长荡湖水生植物群落组成及分布格局

Community Composition and Distribution Pattern of Aquatic Plants in Changdanghu lake

长荡湖是常州市金坛区重要的饮用水源地,为江苏省十大淡水湖之一。运用野外实地调查和遥感影像解译法,调查2014—2017年长荡湖水生植被物种组成、群落组成及空间分布。结果表明:长荡湖水生植物有23科36属57种,单子叶植物为优势分类群;长荡湖水生植被面积占调查区总面积的34.98%,为典型的草—藻过渡型湖泊;共有5种水生植物群落类型,其中荇菜群落分布区面积最大;长荡湖水生植被呈持续衰退的趋势,水位是长荡湖水生植物分布的主要影响因素。建议开展长荡湖水生植被保护和恢复工作,在充分保护长荡湖现有水生植被的前提下,循序渐进恢复湖区水生植被。

Changdanghu lake is an important source of drinking water for Jintan District of Changzhou City,and one of the top ten fresh water lakes in Jiangsu province.The species composition,community composition and spatial distribution of aquatic plants in Changdang Lake from 2016 to 2019 were investigated by using field survey and remote sensing image interpretation method.The results indicated:Monocotyledons plants were the dominant taxonomic group.Grass-dominated state and algal-dominated state were coexisted in Changdanghu lake,the percentage of aquatic plant distribution area to total area was 34.95%.The aquatic plant in Changdanghu lake could be divided into 5 community types,and the Nymphoides peltatum community was the biggest in terms of distribution area and biomass;The number of Aquatic plant continues to decline in Changdanghu Lake.Water level is the main factors affecting the distribution of aquatic plants in Changdanghu lake.On the premise of fully protecting the existing aquatic vegetation in Changdanghu lake,the aquatic vegetation in the lake was restored step by step.