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晋陕蒙 (西 )地区的土地沙漠化受控于多种因子 ,在详尽分析了土地沙漠化的各种因子基础上 ,确定了母质类型、植被覆盖、地貌类型、沟壑密度、土地利用类型、矿山开发面积、大风强度七个致灾因子 ,并分别建立了它们各自的子专题层图。利用先进的层次分析法 (AHP)确定了影响沙漠化的各致灾因子的权重系数 ,通过地理信息系统 (GIS)与AHP的耦合技术 ,对各子专题层图进行了加权复合叠加 ,利用频率和频数分布直方图 ,确定出土地沙漠化的分区阈值 ,构建了土地沙漠化危险度评价的多源地学信息复合叠加模型 ,并对土地沙漠化危险度进行了分区评价 ,共划分为五个区 ,即强度区、中度区、轻度区、潜在区、未沙区。土地沙漠化评价模型的建立 ,为土地沙漠化的分区评价与预测提供了理论依据 ,使评价结果更科学、合理、准确。
Based on a detailed analysis of various factors of land desertification, the desertification of land in Shanxi, Shaanxi, Inner Mongolia and the west (West) is controlled by many factors. The types of parent material, vegetation cover, topography, gully density, land use type, Area, gale intensity seven hazard factors, and established their respective subtopograms. The AHP method is used to determine the weight coefficients of various hazard factors affecting desertification. Through the coupling of geographic information system (GIS) and AHP, the sub-thematic maps are weighted and superimposed, and the use frequency and Frequency distribution histogram to determine the regionalization of desertification threshold of the land to build a risk assessment of land desertification multi-source geosciences information composite overlay model, and the risk assessment of desertification were divided into five areas, divided into five areas, namely the intensity of the area , Moderate zone, mild zone, potential zone, non-sandy zone. The establishment of land desertification evaluation model provides a theoretical basis for the zoning evaluation and prediction of land desertification, and makes the evaluation results more scientific, reasonable and accurate.