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基于景观格局的武汉市江夏区土地利用生态风险评价
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亚博app (huazhongnongyedaxue gonggongguanlixueyuan, wuhan 430070)

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Ecological Risk Assessment of Land Use in Jiangxia District of Wuhan Based on Landscape Pattern
HOU Rui, LI Hongbo, GAO Yanli

(college of public administration, huazhong agricultural university, wuhan 430070, china)

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土地利用生态风险评价是统筹山水林田湖草系统治理的工作基础,对于优化区域生态安全格局具有重要意义。基于2000—2015年4期遥感影像解译数据,对武汉市江夏区土地利用时空格局动态变化进行了分析,通过划分空间格网构建基于景观格局的土地利用生态风险指数,对研究区生态风险时空变化特征进行评价,进而探究不同土地利用类型下的生态风险演变规律及其响应弹性机制。结果 表明:(1)江夏区主要土地利用类型为耕地和水域,在研究期内8.41%的耕地转出为建设用地,集中分布在江夏区北部,并呈现不断向周围扩张的态势。(2)研究区各时期土地利用生态风险在空间上整体分异显著,呈现集聚效应,局部空间差异也呈扩大趋势。(3)15年来,研究区整体生态风险增大,生态风险指数平均值由0.117 4上升到0.190 8,低生态风险区面积占比从49.81%下降到0.01%,其他各级生态风险区面积表现为不同程度的增加。(4)耕地、建设用地、水域受生态风险胁迫程度较轻,未利用地的生态风险最高。同时,地类变化对生态风险的影响程度在不断减弱,生态风险的影响因子更趋于多元化。

ecological risk assessment of land use is a basis for the systematic management of mountains, rivers, forests, farmlands, lakes and grasslands, and is of great significance for optimizing the regional ecological security pattern. based on the interpretation data of remote sensing images from 2000 to 2015, we analyzed the spatial and temporal patterns of land-use dynamic changes in jiangxia district of wuhan, and then used the spatial grid to construct land-use ecological risk index in jiangxia, which based on landscape pattern, in order to explore the spatial distribution and variation characteristics of ecological risks. next, we explored the evolution process of ecological risk under different land use types and its response elasticity mechanism. the results are shown as follows.(1)the main land types in jiangxia district were cultivated land and waters. during the study period, 8.41% of the cultivated land was changed into construction land, which concentrated in the northern part of jiangxia and gradually expanded to the surroundings.(2)the spatial distribution of land-use ecological risks were obviously different, and showed the agglomeration effect. in addition, the local spatial difference was also increasing.(3)in the past 15 years, the overall ecological risk of the study area had increased. the average value of the ecological risk index had increased from 0.117 4 to 0.190 8. the area ratio of low-level ecological risk zone had decreased from 49.81% to 0.01%. the area of other-levels ecological risk zone had increased in different extent.(4)arable land, construction land, and water area were less threatened by ecological risks, and the ecological risk of unused land was the highest. in addition, the impact of land use change on ecological risk continued to weaken, and the impact factors of ecological risk were more diversified.

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