山区河流生态河道治理工程扰动区植被群落恢复的影响研究

工程扰动严重破坏原有地形地貌和生态植被,加剧生态环境的恶化与生态系统的退化,为减少水土流失和浅层滑坡,加速植被恢复和生态修复,对工程扰动区植被群落恢复进行研究是比较有意义的课题。研究选择生态治理后处于自然恢复期的石葵河作为研究对象,对工程扰动区不同水位的植被恢复进行季节性监测和实地调查,统计河道边坡植被恢复种类及数量、植被群落类型及其结构特征。经调查统计,常水位以上植被种类为43种,常水位以下只有17种;常水位以上Pielou均匀度指数为0.774,而常水位以下Pielou均匀度指数仅为0.397;常水位以上基本形成乔灌草垂直分布的植被群落结构,常水位以下全部是草本植物。说明水位变化对工程扰动区植被恢复有很大影响,水位变化不仅对植被恢复种类和数量有影响,而且还影响植被的生活型和生长型。

Research on the Influence of Vegetation Community Restoration in the Disturbed Area of Ecological River Regulation Project in Mountain Rivers

Engineering disturbance seriously damages the original topography and ecological vegetation,exacerbates the deterioration of the ecological environment and the degradation of the ecosystem.In order to reduce soil erosion and shallow landslides,accelerate vegetation restoration and ecological restoration,this paper studies the vegetation community restoration in the engineering disturbance zone meaningful subject.In this study,the Shikui River,which is in a natural recovery period after ecological governance,was selected as the research object.Seasonal monitoring and field investigations were carried out on vegetation restoration at different water levels in the project disturbance area.The types and numbers of vegetation restoration on river slopes,vegetation community types and their Structure.According to survey statistics,there are 43 vegetation types above the normal water level and only 17 species below the normal water level;the Pielou evenness index above the normal water level is 0.774,and the Pielou evenness index below the normal water level is only 0.397;Vertically distributed vegetation community structure,all herbs below normal water level.It shows that the change of water level has a great impact on the vegetation restoration in the project disturbance area.The change of water level not only affects the types and quantity of vegetation restoration,but also affects the vegetation's life form and growth type.