Study On Index System Of Ecological Corridor Construction In Daqing River Basin Under Moderate Restoration Target

Located in the northern part of North China,Daqing River Basin is an important region in the ecological security pattern of the North China Plain,which directly affects the ecological security pattern of Beijing-Tianjin-Hebei Region and even the North China Plain.However,the total population in the basin is large,the density is high,and the resource development is intense.In the process of the urbanization of the basin,a series of problems such as insufficient ecological space,serious soil erosion,and habitat patch fragmentation have appeared.After the establishment of the Xiongan New Area,higher functional requirements have been proposed for the ecological and economic aspects of the Daqing River Basin.Building ecological corridor to restore regional ecological development is a hot spot in the today’s ecology.Daqing river basin was taken as the research background,through the study of basin ecological corridor construction of index system,the new corridor construction strategy and method were proposed.It has great significance for the next Daqing River Basin ecological restoration and ecological corridor planning layout.The main conclusions are as follows.(1)Based on the study of relevant policies and regulations and combining with ecological contribution in special area of the basin,two strategic orientation has been proposed.And the strategic orientation were explained in the follow topics:the water function regionalization,flood discharge capacity,greening projects,nature reserves and the ecological function regionalization for specific interpretation.At the same time,the construction of the corridor should not be limited to one level.Therefore,under the guidance of the strategic positioning of the basin,five major ecological positioning in the macro scale of Daqing River Basin are summarized.Based on the analysis of the flood control system and the current situation of the river,and combined with the macro positioning,the meso-scale service function objectives of the Daqing River Basin are summarized.Finally the results explain that the ecological restoration in Daqing River Basin should be moderate,and proposes three levels of moderate restoration.(2)From the macro point of view of corridor construction,the second-level target layer and 9 pattern indexes were determined.At the meso-scale,the service function of the ecological corridor is the reflection of the interaction of ecosystem structure and processes.In this research,the meso-spatial structure indexes of the corridor are classified into four categories: width,curvature,connectivity,and internal environment,and seven indexes are identified.The index system of ecological corridor in Daqing River Basin is constructed by the index system of macroscopic scale and macroscopic scale.(3)Ecological orientation,ecological zoning,sources and ecological corridors constitute the Daqing river basin macro-scale ecological security pattern,under the condition of water completely guaranteed,the formation of the "five area ten source seven gallery" ecological security pattern,and in the present stage of water under the condition of limited only modest recovery "five area seven source four axis" pattern.The spatial structure planning of the mesoscale specific river reaches is carried out with the example of "Baiyangdian-Wenanwa-Duliu Lower Reach Ecological Corridor Main Axis".