基于GIS的县域耕地自然质量等空间分异规律研究——以云南省石林县为例

发布时间：2018-05-20 04:48

本文选题：自然质量等 + 空间分异　；参考：《中国农业资源与区划》2017年07期

【摘要】：[目的]通过研究耕地自然质量及空间分异规律,以期对耕地资源的合理利用与保护进行指导。[方法]文章以喀斯特岩溶区域典型县石林县为例,在分等数据库与二调数据库衔接基础上,采用GIS空间分析法、数理统计法,对表征耕地自然质量的因子自然质量等的空间分异规律进行探讨。[结果](1)不同行政区域内自然质量等集中程度差异显著,分异规律明显;各行政区域内分布规律高度相似,以中心城镇为最优,呈同心圆向外围辐射发散趋劣。平均自然质量等由优趋劣依次为长湖、鹿阜、圭山、西街口、大可。(2)不同耕地利用类型自然质量等分布差异不大;各耕地利用类型等别集中差异显著:水田、水浇地等别较高,多集中连片分布在坝区、河谷沿岸,旱地等别较低,多为零星分散的缓坡耕地。平均自然质量等水浇地略优于水田,旱地最差。(3)受大尺度光温、气候生产潜力指数影响,自然质量等在不同海拔梯度间耕地等别分布差异不大,且等别集中程度高度相似。从整体看,耕地等别随海拔梯度升高呈现降低趋势,部分区域小幅反弹。[结论]耕地自然质量作为耕地的本底质量,在县域尺度具有独特的分异规律。
[Abstract]:[objective] to guide the rational utilization and protection of cultivated land resources by studying the laws of natural quality and spatial differentiation of cultivated land. [methods] taking Shilin County, a typical karst county in karst area, as an example, the paper adopts GIS spatial analysis method and mathematical statistics method on the basis of the connection between graded database and binary database. This paper discusses the spatial differentiation law of factors such as natural quality which characterizes the natural quality of cultivated land. [results] (1) the degree of concentration of natural quality in different administrative regions was significantly different, the law of differentiation was obvious, the distribution law of each administrative region was highly similar, the central town was the best, and the radiation of concentric circle to the periphery was worse. The order of average natural quality is Changhu Lake, Lufu, Guishan, Xijie Kou, Dake. 2) the distribution of natural quality of different cultivated land use types is not different, and the difference of different cultivated land use types is significant: paddy field, irrigated land, etc. Most of them are distributed in dam area, river valley, dry land and so on, most of them are scattered gentle slope cultivated land. The average natural quality of irrigated land is a little better than that of paddy field, and the worst of dryland is affected by large scale light and temperature, climatic productive potential index, natural quality and so on. The distribution of cultivated land in different elevation gradients is not different, and the degree of isotropic concentration is highly similar. As a whole, cultivated land and so on showed a decreasing trend with the elevation gradient, and some regions rebounded slightly. [conclusion] as the background quality of cultivated land, the natural quality of cultivated land has a unique differentiation law at the county scale.
【作者单位】：云南农业大学水利学院;云南农业大学国土资源科学技术工程研究中心;国土资源部"土地利用——云南陆良野外基地";云南省土地资源利用与保护工程实验室;
【基金】：十二五国家科技支撑计划课题“西南睦边扶贫区基本农田建设技术研究与示范”(2015BAD06B04)
【分类号】：F323.211

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