贵州草海湿地区域土地利用生态风险评估

Ecological Risk Assessment of Land Use in Caohai Wetland Region of Guizhou Province

探索土地利用基础上的生态风险,对土地资源的合理利用和实现生态环境的动态平衡具有重要现实意义。以贵州草海湿地区域为研究对象,利用遥感影像数据提取土地利用数据,通过构建生态风险指数,分析研究区生态风险时空演化特征。结果表明:(1)草海湿地区域土地利用生态风险有向高风险变化趋势。(2)近20年来,草海湿地区域以中等和较低生态风险为主,生态风险空间变化特征发生的转换主要是向高一级生态风险方向转换。(3)从地形特征影响来看,草海湿地区域不同高程带和坡度带的生态风险指数均出现不同程度的增加。

Exploring ecological risks on the basis of land use,which is of great practical significance to the rational utilization of land resources and the dynamic balance of ecological environment.Taking Caohai wetland area of Guizhou province as the research object,the land use data was extracted from remote sensing images,and the spatial and temporal evolution characteristics of ecological risk were analyzed by constructing ecological risk index.The results showed that:(1)The ecological risk of land use in Caohai wetland area tended to be high-risk.(2)In the past 20 years,the Caohai wetland area had been dominated by medium and low ecological risks,and the transformation of the spatial changes of ecological risks had mainly been to the direction of higher-level ecological risks.(3)From the perspective of the influence of topographical features,the ecological risk indexes of different elevation zones and slope zones in Caohai wetland area had increased to varying degrees.