Study On Ecological Security Of Wetland In Chang-zhu-tan Urban Agglomeration Based On OWA-GIS

Ecological security is a global and regional issues,and wetland is closely related to human settlements.Therefore,it is of great practical significance to study the ecological security of wetland.This paper took Chang-Zhu Tan Urban Agglomeration as study area.Data onto land use was interpreted from Landsat TM image of four periods(1995,2000,2005 and 2010).PSR model was used to build ecological security evaluation index system combined with the economic and climate,landscape structure and function and so on.Based on ArcGIS and IDRISI software platform,OWA spatial multi criteria evaluation method was carried on the preliminary study of wetland ecological security.The main conclusions were as follows:(1)The ecological security index of the wetland was increased from the urban agglomeration of 1995 to 2010.Affected by natural,social and economic factors,the regional ecological security index of wetland showed the trend of decrease-to increase-decrease;There were minimal regional differences in ecological security index of in Changsha,Zhuzhou and Xiangtan.;The spatial distribution of wetland ecological security indexs is closely related to the types of wetland use and its vulnerability.(2)Based on SPSS,correlation analysis of ecological security index and the factor found that:the ecological security index was significantly correlated with patch number,patch fractal dimension,fragmentation index,wetland area change,wetland ecosystem service value,landscape stability index.(3)Land uses affect the wetland ecological security,mainly by changing land use structure and form,caused the wetland area changes,which directly affect the wetland ecological security.Based on the above conclusions,using the Ca-markov model on the perspective of the wetland spatial distribution characteristics the spatial distribution pattern was simulated.Simulation results show that with the development of the regional social and economic the area of wetland resources gradually decrease,which might weaken the function of wetland ecosystem,cause an effect of regional social and economic development.The results are of great significance to regional ecological environment construction.