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在GIS的支持下,通过土壤图和土地利用现状图叠置的方法划分评价单元,采用特尔斐法选气候、立地条件、剖面性状、耕层养分状况等4个方面的10因子个建立评价指标,运用层次分析法和模糊数学方法对耕地地力进行综合评价,并就其空间分布进行了分析。结果表明:安定区各等级耕地比例相对差异较大,其中以三等地为主,占到了总耕地面积的43.63%;其次是二等地和四等地,分别占到总耕地面积的26.60%和25.72%;一等地面积最小,占总耕地面积的4.05%。从各等级分布的地域特征看出,耕地地力等级的高低与地貌类型、土壤类型存在着密切的关系,并呈现明显的地域分布规律,随着耕地地力等级的递增,地貌类型由川台地向黄土丘陵过渡。
With the support of GIS, the evaluation unit was divided by the method of overlay of soil map and land use status map, and the evaluation method was established by using 10 factors, including climate, site conditions, section traits and nutrient status of the topsoil. Indicators, the use of analytic hierarchy process and fuzzy mathematics method of comprehensive evaluation of farmland productivity, and its spatial distribution were analyzed. The results showed that the relative proportions of cultivated land of different grades in Anding district were relatively large, of which the third was mainly, accounting for 43.63% of the total cultivated land; the second, second and fourth places accounted for 26.60% And 25.72% respectively; the first-class area is the smallest, accounting for 4.05% of the total cultivated area. It can be seen from the geographical characteristics of each grade distribution that the level of arable land’s soil fertility is closely related to the type of landform and soil types and shows obvious geographical distribution. With the increase of the grade of arable land, Hilly transition.