Effects of land use structure change on regional ecological health-Taking Shapingba County of Chongqing as an example
土地利用结构变化对区域生态健康的影响——以重庆市沙坪坝区为例

Land resource is the carrier for the exchange of matter,energy and information flows,while the change velocity and the intensity of land use has strong effects on the ecological processes such as matter circulation,energy flow,and biologic diversity.Land use structure change will alter the type,area,and spatial distribution of ecosystem,and in the meantime,result in the changes of regional ecological health.Employing the principles and methods of landscape ecology,and through endowing relative ecological value to land use type,this paper analyzed the characteristics of recent 10 years land use change in Shapingba County of Chongqing,and discussed the effects of land use change on regional ecological health,aimed to provide scientific references for land use planning and sustainable land resource utilization.The results indicated that transformation often occurred among different land use types,and the land use structure in each transformation phase differed quite obviously.Under different land use structure,there was a great disparity in relative ecological value of sub-ecosystems,which played various roles in regional ecological health.In general,the regional relative ecological value embodied both increase and decrease.In the future,the relative ecological value of sub-ecosystem would represent three tendencies,i.e.,increase first and decrease then,continuous decrease,and continuous increase.The situation of regional ecological health would gradually become better.