基于空间自相关的丘陵山区耕地质量保护分区

在中小尺度区域内采用空间分析方法对耕地质量分布规律开展研究,可以为地形地貌条件较为复杂的丘陵山区永久基本农田划定、退耕还林计划、国土空间综合整治与生态修复等工作提供理论和实践支撑。采用空间自相关分析的方法,对重庆市南川区的质量等指数进行空间自相关分析,并根据局部空间自相关结果的组合对全域耕地进行保护分区。实验结果表明:(1)研究区域耕地质量指数在空间上呈现集聚特征,集聚程度大小关系为利用等指数>经济等指数>自然等指数;(2)高值集聚区(HH型)主要分布于西北部,低值集聚区(LL型)主要分布东南部,实验结果与南川的地形、水系、交通设施布局等自然经济条件相吻合;(3)划分的4个耕地保护分区与研究区域的实际情况相匹配。

Protection Zoning of Cultivated Land Quality in Hilly Area Based on Spatial Autocorrelation

Using spatial analysis method to study the distribution patterns of cultivated land quality in small and medium-sized areas can provide theoretical and practical support for the delimitation of permanent basic farmland,the plan of returning cultivated land to forest,the comprehensive treatment of land space and ecological restoration in hilly areas with complex landform conditions.This paper uses the method of spatial autocorrelation analysis to analyze the quality and other indexes of Nanchuan District in Chongqing,and puts forward that the whole cultivated land shall be protected according to the combination of local spatial autocorrelation results.The results show that:(1)the cultivated land quality index of Nanchuan district shows the characteristics of agglomeration in space,and the degree of agglomeration is the utilization index>the economic index>the natural index;(2)the high value agglomeration area(HH type)is mainly distributed in the northwest,the low value agglomeration area(LL type)is mainly distributed in the southeast,and the experimental results are consistent with the natural economy of Nanchuan,such as topography,water system,transportation facilities layout,etc;(3)the four cultivated land protection zones are matched with the actual situation of the research area.