基于空间自相关的耕地质量分布格局

耕地质量是保障粮食安全的基础。以广东省广宁县为例,采用空间自相关分析法,基于全局、局部和方向3个视角,对耕地质量空间分布特征进行分析。结果表明:全局来看,广宁县耕地质量在空间分布上具有较强的空间正相关性,且县级尺度空间自相关程度强于镇级尺度;局部区域,县域耕地质量存在聚集性分布规律,高质量耕地集中分布在排沙镇北部、江屯镇中部和螺岗镇南部,低质量耕地集中分布在赤坑镇中南部、古水镇东北部以及北市镇东北部;县域耕地质量在各方向上的结构性特征表现不一,在距离1 650 m范围内基本趋于一致,但随距离增加其结构性特征在各方向上呈现不同走势。

Spatial Pattern Disparity of Arable Land Quality Based on Spatial Autocorrelation Analysis

Compared with the quantity of arable land , quality is the foundation to guarantee the safety of food-stuff permanently .To stereoscopic cognizing the arable land quality and its spatial pattern disparity , the spatial au-tocorrelation theory was introduced in this paper by taking Guangning County in Guangdong Province as the object for exploring the spatial distribution characteristic of arable land quality from the point of global and local and orien -tation.The results indicate that the arable land quality in Guangning County has a powerful positive spatial autocor -relation in spatial distribution from the global view point , and the degree of positive spatial autocorrelation is differ-ent with kinds of scale , the scale of county is more powerful than the scale of town in Guangning County .The arable land quality in Guangning County exists an agglomerate pattern in local region , and the high quality of arable land concentrate spread over the north of Paisha Town and the center of Jiangtun Town and the south of Luogang Town , while the low quality of arable land concentrate spread over the south-central of Chikeng Town and the north-east of Gushui Town and the north-east of Beishi Town .The arable land quality in Guangning County shows an obvious structural property in orientation , in the range of 1 650 meters, the structural distribution of arable land quality is al-most uniformity , while with distance increased , the structural distribution of arable land quality is diverse in different kinds of orientation .The results can provide decision-support for land consolidation and management of arable land .