Study Of Ecological Planning And Restoration Of Yongding River Ecological Corridor Based On Dynamic Evaluation Of Landscape

Yongding River,as the second largest river flowing through Beijing,was historically the main source of water in Beijing.Today,the ecological corridor of Yongding river is an important ecological corridor in southwest Beijing.However,the ecological function of the river corridor is affected by the problems of water shortage and unreasonable layout in riparian zone caused by human disturbance.It is of great significance for the ecological restoration and rational planning of the ecological corridor of Yongding River to explore the changing characteristics of the landscape pattern of Yongding River.In this study,the section of the Yongding River from Luopoling Reservoir to Daning Reservoir with the riparian zone with a buffer area of 2000 m in the river are selected as the research object.The first part using ENVI for 1999,2004,2009,2014,2014,5 about land use remote sensing image interpretation,using the transfer matrix of land use and landscape pattern index to research area in recent 20 years the number of different types of land,evaluating and analyzing the degree of landscape fragmentation and artificial interference factors to the positive or negative effects of watershed landscape pattern.The main conclusions are include:(1)From the degree of land area,the land use type in the study area is mainly forest.From 1999 to 2004,due to the expansion of Beijing city,farmland and unused land were converted into construction land,and the construction land area along the river increased rapidly.During 2004 to 2009,with the ecological management of Yongding river,the industrial land was vacated and the grassland along the river was converted into woodland.From 2009 to 2014,the riverside park system of "five lakes and one line" was built,which promoted the obvious growth of water area.In the horizontal dimension,the transfer of construction land,grassland,cultivated land and unused land is always high.(2)At the level of landscape pattern,the fragmentation degree of forest land and water area is relatively low.The ecological management of yongding river makes the connectivity of water area recover to a certain extent,and the fragmentation degree decreases,but the fragmentation degree increases at the landscape level.The second part on the premise of landscape pattern,using the Arcgis analysis combined with field investigation,to identify ecological fragmentation high area,put forward from optimal space planning layout.According to the ecological status of different sections of the river,the corresponding strategies are put forward from the perspectives of restoring the natural habitat of the river,restoring the vegetation in riparian zone and purifying the water quality.