Study On The Green Space Ecological Benefit Of Hefei Based On Landscape Pattern

With increasing proceed of urbanized advancement,the surface morphology and the original natural ecological environment have also been changed.In the other hand,influenced by the urbanization,the landscape pattern of urban green space been undergoing a most severe alteration.In the same time,it also has produce a profound effect on the regional natural,ecological and socio-economic processes.By analyzing the data from remote sensing images,we can make an evaluation for the city development in a more accurate and convenient way and provide more evidence for the decisions made in the overall plan of urban construction and administration.As the provincial capital of Anhui and a core city in Wan-Jiang city belt,Hefei has made a great progress in urbanization.During this process,its landscape pattern of urban green space has been changed a lot.As a result,this paper will take Hefei as the example,based on the support of theory and technology of landscape ecology,landscape pattern index,urban green space,remote sensing and ArcGIS,to analyze the Landsat remote sensing images of Hefei in three different years which cross two decades years in total.Exploring and analyzing the evolution of the landscape pattern of its green space,and explores the changes of landscape pattern in urban green space,to provide a data support for the overall optimization of urban landscape pattern and the construction and transformation of green space in Hefei.The main research methods and results of this paper are as follows:(1)Based on the study of landscape pattern evolution in Hefei,this paper use the remote sensing images of Landsat in 1995,2007 and 2015 as the basic data in this paper and mainly apply the spatial information technology such as remote sensing and GIS as the technical support.By comparing some basic classification method,this paper use the maximum likelihood classifier in supervised classification to classify these image data.By this method,5 kinds of land type have been recognized,including buildup,water,forest,farmland and other land,obtained in the past two decades The change of land use type in Hefei.The results show that the area of agricultural land has decreased sharply with the urbanization process in Hefei,while the area of construction land has increased dramatically,at the same time,the area of forest land has gradually increased with the implementation of green space protection policy.(2)Based on the analysis result of the remote sense images,the scape pattern indexcan be produced by using GIS and Fragstats3.3,and the area of each kind of land type has been studied.Also,the percentage of the area of the entire study area,the proportion of the area of the entire study area,the landscape shape index.To provide data support for the study,the results shows that the landscape pattern of Hefei in the study period changes with the expansion of urban construction space.The land area of the agricultural land is the largest during the study period,and the urbanization makes the green space landscape structure become more complicated.In the same time,the landscape is broken,the degree of spatial heterogeneity increases,the urban ecosystem is segmented by human disturbance in urban development and construction,and the artificial traces has been aggravated.(3)By the research data of the evaluation of regional green space,this paper will using GIS technology and CityGreen's eco-benefit analysis module to analyze the evaluation of the ecological benefits of the green space in Hefei,including the analysis of carbon storage and carbon uptake efficiency,reduction of storm runoff benefit and air pollution.The results show that the ecological benefits of green space in Hefei from 1995 to 2015 are overall in a rising trend,and each district has a slight fluctuation during my study period.Based on the theory of landscape ecology,landscape pattern and green space,this paper will study the landscape pattern evolution of Hefei from 1995 to 2015 and the change of the green space ecological benefits from the macro-scale perspective with the support offered by ENVI,GIS and Fragstats3.3 software.The study will provide a data support for the overall optimization and upgrading of the urban landscape pattern in Hefei,so that more ecological benefits will be produced.