Study On Site Classification And Ecological Restoration Of Damaged Land In Yu County Wind Farm

In recent years,China’s wind power construction rapid development,at present China’s wind power grid for the world’s wind power.However,high-intensity human interference has caused vegetation degradation to show more and more characteristics of large-scale,chain,and spreading.It is urgent to solve the problems of ecosystem function damage and ecological chain interruption caused by human interference from a global perspective.This paper takes the damaged land of the Yu County Wind Farm Project in Zhangjiakou as the research object,and uses the method of combining field data survey,remote sensing interpretation,GIS technology and indoor test data processing and analysis to analyze and clarify the impacts on the damaged land of the Yu County Wind Farm Project.Based on site factors and site characteristics,a systematic site classification system was constructed,scientific and reasonable site types were classified,and the evolution law of vegetation restoration of different site types and the vegetation composition model of different site types were discussed,and then the ecological restoration suggestions suitable for different site conditions was proposed.The main findings are as follows:(1)Site characteristics of damaged land in Yu County Wind Farm ProjectA total of 117 survey sample plots were laid out using a combination of typical plots and the method of sampling lines,and the comprehensive characteristics of geology,soil,vegetation,and topography were investigated in the study area.The investigation revealed that the water and soil conservation measures in the study area lacked slope restoration measures;The soil organic matter content is high,but the soil layer thickness is thinner,and the gravel content is high;the wind turbine slope and the road slope in the field have a large slope and the soil layer is thin;the soil-forming parent rock is a sample plot of shale under similar site conditions There are more kinds of plants;shrubs appear in the vegetation restoration on the shady slope of the road side slope in the lower altitude under similar site conditions.(2)Establish a three-level site type classification system of "land functional area-soil layer thickness-micro-topography" wind farm project damaged landOn the basis of Yu County habitat characteristics of damaged land wind engineering site factor,and affect the ecological restoration of the selected using correlation and principal component analysis,determine the impact of the classification of the site main limiting factors for soil thickness,altitude,slope and slope direction.A three-level classification system of "land functional area-soil layer thickness-micro-topography" has been established for the site type of damaged land for wind farm projects,including 5 first-level functional type areas,followed by wind turbines and box-type transformer areas,on-site road areas,Boost station area,waste slag area and construction site area,the main classification indicators are wind farm engineering damaged land functional use;9 secondary types,the main classification indicator is soil thickness;28 tertiary types,mainly divided the indicators are altitude,slope and aspect.(3)Vegetation characteristics of different site types of land damaged by wind farm projectsAfter systematically dividing site types,from the perspectives of vegetation type,plant composition,vegetation community diversity,and important vegetation values,the distribution of vegetation communities of different site types and the distribution of vegetation composition and altitude,slope direction,and soil thickness are discussed.According to the similarities in the composition of plant communities,12 communities recovered by plants of different site types were found,which are wormwood community,Potentilla chinensis-Elymus vulgaris community,Spiraea-carex green grass-wormwood community,Seabuckthorn-Carex lanceolata-Artemisia annua community,Duxiang-Carex lanceolata community-Artemisia lanceolata community,Lespedeza lanceolata-Red chrysanthemum-Prunus vulgaris community,Golden Dew plum-Carex lanceolataPotentilla community,Silver Dew Plum-Potentilla chinensis-White lotus Artemisia community,Tuzhuang Spiraea sibiricum Potentilla-Feilian community,Green CarexPotentilla community,Potentilla-Red chrysanthemum community and LiudaomuPlantago-Pennisetum Community.(4)Plant assembly model for ecological restoration of damaged land in wind farm projectsOn site based on the results of classification of plants in different site type important values and the calculation of plant diversity,and according to the plant,the important value of dominant species and plant equipping research site vegetation characteristics,system research and classified,determine the vegetation in different site type groups,Neutral site type Ⅰ-1-1,Ⅰ-1-2,Ⅰ-1-3,Ⅰ-1-4,Ⅰ-4-1,Ⅰ-4-2,Ⅰ-4-6,Ⅰ-4-7,Ⅰ-4-8,Ⅱ-1-3,Ⅱ-4,Ⅱ-1-6 configure dominant herb species,site types Ⅰ-2-1,Ⅰ-2-2,Ⅰ-2-3,Ⅰ-3-1,Ⅰ-4-3,Ⅰ-4-4,Ⅰ-4-5,Ⅱ-1-1,Ⅱ-1-2,Ⅱ-1-5,Ⅲ-1-1,Ⅲ-1-2,Ⅲ-1-3,Ⅳ-1-1,Ⅳ-2-1 and Ⅴ-1-1 are equipped with dominant shrub and grass species.In order to ensure the effect of vegetation restoration in the later stage,corresponding ecological restoration suggestions were put forward according to the characteristics of different site types.To sum up,reasonably divide the site types of the damaged land of the Yu County wind farm project,and carry out vegetation composition and ecological restoration according to the site type,and strengthen Yu County wind farm project land vegetation restoration of damaged work target,at the same time can provide reference for wind engineering damaged land follow-up studies.