甘肃省耕地集约利用空间分析

Spatial Analysis of Cultivated Land Intensive Utilization in Gansu Province

为分析甘肃省耕地集约利用的空间差异,以各县(区)为研究对象,首先选择耕地投入强度、耕地利用强度、耕地产出强度和耕地持续利用强度4个准则层、17个评价指标建立评价体系,运用熵值法和层次分析法综合确定各指标权重,计算出甘肃省各县(区)耕地集约利用度得分;然后,利用Arc Gis对各县(区)耕地集约利用得分进行分级;最后利用Geo Da对其进行空间自相关分析。结果表明:耕地投入强度对耕地集约利用影响最大;全省耕地集约利用整体水平较低,87个县(区)中处于集约利用较低水平的有51个;耕地集约利用水平空间差异大,嘉峪关市最高,合作市最低,嘉峪关市是合作市的45倍;耕地集约利用地域性特征明显,存在空间聚集现象,河西地区西部为耕地集约利用高值聚集区,陇中和甘南高原一带为低值聚集区。

This research analyzed the spatial difference of cultivated land intensive use in every country of Gansu Province. Firstly, 4 criterion layers were chosen including input intensity, use intensity, output intensity, sustainable utilization intensity of cultivated land and 17 evaluation indices were used to build evaluation system, and then every index weight was gotten using the entropy and the analytic hierarchy process(AHP) method, and the scores of cultivated land intensive use in every county of Gansu Province were calculated. Secondly, the cultivated land intensive use was evaluated based on its score with Arc Gis. Lastly, spatial auto correlation analysis of cultivated land intensive use was done by Geo Da. Results showed that input intensity had the most important effect on the cultivated land intensive use. The intensive use level was lower in 51 counties of the total 87 counties, which indicated the low intensive use of cultivated land in the whole Gansu Province. The spatial differences were tremendous. The intensive use level of cultivated land in Jiayuguan, the highest, was 45 times of that in Hezuo. There were spatial agglomerations in intensive use of cultivated land in Gansu Province: the high-high accumulation zones were mainly distributed in Hexi area, and the low-low aggregation mainly in the middle of Gansu Province and Gannan plateau.