基于GIS格网模型的银川市土地生态安全评价研究

发布时间：2018-11-08 06:43

【摘要】：为探索市域范围内土地生态安全的粒度特性及其空间效应,论文结合PSR理论框架构建评价指标体系,以公里格网为评价单元,采用熵权法计算区域土地生态安全综合指数。银川市的实证分析表明,2014年整个区域土地生态安全指数为0.488 2,市域范围内土地生态安全存在着空间异质性和结构功能分化的双重特征。从宏观行政区划层面来看,3个中心辖区表现相对较为均衡,2个郊区县差异性较大,仅有贺兰县(0.557 7)高于全市均值;从微观格网尺度来看,北部和城市中心的综合指数较高且呈离散分布,城市边缘区较低且呈集聚分布;从土地利用功能区的角度来看,农业区、城市建城区、湿地和自然保护区的核心区域综合指数较高,而功能边缘区与交叉区较低,土地生态安全和土地利用方式存在耦合关系。通过ESDA空间分析表明,格网尺度下土地生态安全全局Moran’s I指数为0.780 4,生态安全的空间格局表现出空间连续性和聚集效应。因此,从空间建构的视角来看,应充分利用"高高聚集"区的空间扩散和溢出效益,并通过逐步改善影响"低低聚集"区的限制性因子,实现区域内部土地生态安全格局的优化配置。
[Abstract]:In order to explore the grain size characteristics and spatial effects of land ecological security in urban area, the paper constructs an evaluation index system based on PSR theory, and calculates the comprehensive index of regional land ecological security by entropy weight method, taking kilometer grid as evaluation unit. The empirical analysis of Yinchuan City shows that the land ecological security index of the whole region in 2014 is 0.488 2. The spatial heterogeneity and the structural and functional differentiation of land ecological security exist in the scope of the city. From the macro administrative division level, the performance of the three central districts is relatively balanced, the difference between the two suburban counties is great, only Helan County (0.557 7) is higher than the average of the whole city. From the microcosmic grid scale, the composite index of the north and the city center is higher and discrete, and the urban fringe is low and concentrated. From the point of view of land use function area, the comprehensive index of the core region of agricultural area, urban district, wetland and nature reserve is higher, while the functional edge area and cross area are lower, and the land ecological security and land use mode have coupling relationship. The ESDA spatial analysis shows that the global Moran's I index of land ecological security is 0.780 at grid scale, and the spatial pattern of ecological security shows spatial continuity and aggregation effect. Therefore, from the perspective of spatial construction, we should make full use of the spatial diffusion and spillover benefits of the "high agglomeration" area, and gradually improve the restrictive factors that affect the "low and low aggregation" zone. To achieve the optimal allocation of land ecological security pattern within the region.
【作者单位】：山东师范大学商学院;
【基金】：国家社会科学基金教育学一般项目(BAA110014) 山东省自然科学基金博士基金项目(BS2015SF014)~~
【分类号】：F301.2;X826

【相似文献】