基于最小累计阻力模型的卢氏县土地生态适宜性评价

按用途可将城市土地景观划分为生态用地和建设用地两部分，这两部分用地扩张可以看作是此消彼长的动态过程。采用ArcGIS软件模拟土地扩张运动，构建以两个过程最小累计阻力差值模型为基础的城市土地适宜性评价机制。以河南省三门峡市卢氏县为例，选取建设用地和生态用地作为土地扩张源，分别从土地固有生态属性因子、外延生态属性因子两个因子，8个方面建立阻力评价体系。评价结果表明，适宜生态保护用地扩张面积为932.14 km²，占县域面积的23.28%；适宜建设用地扩张面积为3 071.87 km²，占县域面积的76.72%。运用最小累计阻力差值模型将卢氏县划分为生态开发不困难、一般困难、较困难、困难4个区域，各区域面积分别为176.18、755.96、811.61、2 260.26 km²，分别占县域面积的4.40%、18.88%、20.27%、56.45%。适于建设用地开发的难易程度分区与适宜生态保护用地相反。

Evaluation of Land Ecological Suitability in Lushi County Based on Minimum Cumulative Resistance Model

The urban land landscape can be divided into two parts of ecological land and construction land. The expansion of these two parts can be regarded as a dynamic process. ArcGIS software was used to simulate the land expansion movement, and the urban land suitability evaluation mechanism based on the minimum cumulative resistance difference model of the two processes was constructed. The case of Lushi County, Sanmenxia City, Henan Province was studied. The construction land and ecological land were selected as the source of land expansion, and the resistance factor system was established from eight aspects of land inherent ecological attribute factor and extension ecological attribute factor. The evaluation results showed that the expansion area of suitable ecological protection land was 932.14 km², accounting for 23.28%; the expansion area of suitable construction land was 3 071.87 km², accounting for 76.72%. The minimum cumulative resistance difference mode divided Lushi County into four areas of not difficult, generally difficult, relatively difficult, and difficult for ecological development, with the areas of 176.18, 755.96, 811.61, and 2 260.26 km², accounting for 4.40%, 18.88%, 20.27% and 56.45% of the county area, respectively. The difficulty level zoning suitable for construction land development was opposite to that suitable for ecological protection land.