摘要
Abstract
With the in-depth implementation of the concept of sustainable development,vegetation ecological restoration technologies have been increasingly applied in the management of degraded river systems.The paper comprehensively investigated the species composition and vegetation characteristics within disturbed river channel areas,aiming to provide practical guidance for river ecosystem restoration.Relying on a water system connectivity project,the disturbed areas of the project were divided into five different zones according to water level and land use types:the main river channel engineering area(A1),the temporary construction road area(A2),the engineering waste rock dumping area(A3),the soil material mining area(A4),and the temporary topsoil stacking area(A5).Vegetation sampling surveys were conducted in these areas,and the α-diversity index was used to comprehensively analyze the vegetation restoration situation in the disturbed areas.The results showed that:1)The species types in the study area were mainly herbaceous plants and shrubs,accounting for 70.59%and 15.98%of the total species,respectively.2)The Patrick richness indices were ranked from high to low as A1,A3,A4,A5,and A2.The Shannon-Wiener index of the vegetation communities in different plots showed a consistent trend with the Patrick richness indices,while the Simpson dominance index was the opposite.3)In the three vertical gradient zones of the main river channel engineering area,as the height increased,the Patrick richness index and Shannon-Wiener index increased,while the Simpson dominance index(D)and Pielou evenness index first decreased and then slightly increased.Herbaceous plants play a dominant role in the vegetation ecological restoration process of the disturbed areas in river channel improvement projects,and a relatively obvious vegetation community of grass,shrubs,and trees had basically formed.There were significant differences in the vegetation restoration effects in different disturbed areas of the project,and water level changed significantly affect the restoration effect of vegetation in the river channel engineering area.The research results can provide references for the layout of vegetation restoration measures in similar river ecological restoration projects.关键词
工程扰动/河道治理/水位变化/植被恢复Key words
engineering disturbance/river management/water level change/vegetation restoration分类
资源环境
