Red Line Delineation And Ecological Security Pattern Construction Of Windbreak And Sand Fixing Function In Ecological Sensitive Area

Based on the analysis of natural ecology and human disturbance,the regional ecological security pattern makes reasonable planning and layout of the landscape elements in the region,to obtain the optimal allocation scheme of spatial elements composed of points,lines and faces.It takes full account of the integrity of the regional ecosystem structure,process and function,to provide guidance for the management and protection of the environment,and to orientate for regional spatial development.This paper taking Zhangjiakou area as the research area,uses the evaluation method of the importance of ecological services and sensitivity,combining with the actual investigation,to deline of the redline of ecological protection.On the basis of the results of ecological protection red line,taking them as the main ecological source.This paper uses the cost distance and the minimum cumulative resistance model to construct the ecological security pattern of Zhangjiakou.The results of this paper are as follows:In view of the actual situation of Zhangjiakou,the research method system combined ecological protection red line delineation and security pattern construction is constructed.First,it is the ecological red line delineation method.According to the process of " Based on the evaluation of the importance and sensitivity of the ecosystem in the study area,the dominant ecological functions are identified and vectorized.On the basis of the combination of various protected areas,the urban development planning and the mining area are eliminated,and the red line with clear boundary is obtained.Followed by the ecological security pattern construction method system.Taking the landscape ecology "patch-matrix-corridor" as the starting point,the MCR model was used to construct the regional ecological security pattern based on the clear red line.The pattern embodies the source and nodes between the combination and spatial configuration.Based on the evaluation of the importance of windbreak and sand fixation and the sensitivity of soil and water loss,combined with the survey of various types of ecological protection land,the ecology protection red line of Zhangjiakou area was comprehensively defined to form the red line pattern of ecological protection.Ecological protection Red line floor area of 12543.55 square kilometers,accounting for 34.08%of the region's land area.Dam down the mountain are mainly along the Taihang Mountains and Yanshan a pulse distribution;dam plateau plaque,sporadic distribution.In the area of ecological protection,the forest land is the main use type,followed by grassland,other types are less distributed,and there is no strong land use type and artificial disturbance.Based on the basic resistance of land use ecological value,the terrain factor,land desertification sensitivity factor and economic factor were used to analyze the basic characteristics of the ecological environment.And the minimum cumulative resistance model is used to identify the ecological corridor and the strategy node.In the Regional ecological security pattern,the best ecological source of the connection area for a corridor,according to the resistance model to identify the ecological corridors,river corridors and corridors constitute is the two corridors.The key position is the important ecological strategy point.Based on the ecological protection red line area,ecological corridor and ecological strategic node at all levels,which provided reference and guidance for its regional development pattern and ecological protection.