The Study On The Evolution Of Landscape Pattern And Identification Of Key Ecological Space Of Liao River Basin In Jilin Province Based On 3S Technology

Liao River Basin(in Jilin Province)belongs to the ecological fragile area,With the accelerated process of urbanization,human activities intensified,resulting in the area of production and living space continues to expand,ecological space has been invaded,the integrity and continuity of landscape structure has been destroyed,the function of ecosystem services has been reduced,the land use structure is unreasonable and the quality of habitat has decreased.Based on the theories of sustainable development theory,ecological security theory,compound ecosystem theory and landscape ecology theory,this paper studies the ecological spatial evolution characteristics of Liao River Basin in Jilin Province by using 3S technology.It integrates multi-source spatial data and non-remote sensing data to build research area From 1989 to 2012,the spatial pattern of landscape pattern was analyzed by Fragstats software from 1989 to 2012.According to the characteristics and evolution of the ecosystem in the study area,the index system of key ecological spatial identification in the area was analyzed and screened,and the spatial distribution of single factor index,which affected biodiversity,soil conservation and water resources security,was obtained.On the basis of hierarchical assignment,the recognition of the importance of single factor ecological space is completed.Based on the pattern of landscape pattern evolution,according to the land ecological suitability,landscape integrity and continuity,the existing land use / land cover status and ecological protection and restoration needs are comprehensively defined,and the key ecological space for ensuring the safety of biodiversity is defined scientifically To maintain the key ecological space,to ensure the safety of regional water resources,the key ecological space.Using GIS spatial analysis technique to comprehensively analyze the single factor ecological importance index and the grading measures of each index were established by using analytic hierarchy process(AHP).The comprehensive identification grading of regional critical ecological space was obtained under ArcGIS platform.The results show that the landscape connectivity of the Liao River Basin in Jilin Province is better,the complexity of the landscape pattern is reduced and the degree of disturbance is greater.The core ecological land of the study area is mainly distributed in the northeastern part of the study area and near the river system in the middle of the study area,which are the key area of regional ecological protection and ecological restoration.Should strengthen the study area of biological diversity,water quality protection,improve soil retention capacity.Based on the identification of key ecological spaces in the Liao River Basin of Jilin Province,it can provide theoretical support for regional ecological security evaluation and early warning,and provide scientific basis for regional ecological environment management.