西丰县耕地地力评价研究

Analysis on Cultivated Land Fertility Evaluation in Xifeng Country

以辽宁省铁岭市西丰县为研究对象,对该区域耕层养分性状、耕层理化性状、立地条件和土壤管理等现状进行调查和分析,并结合"3S"技术,运用层次分析法和特尔菲法对该区域耕地地力进行评价,综合考虑研究区土壤、管理和地形等特征,收集整理各县区相关图件、资料,建立耕地资源数据库,拟选用的基础评价单元为土地利用现状图中的耕地图斑,拟选用的评价因子有地形坡度、坡面构型、岩石露头率、有效土层厚度、土壤质地、排水能力、灌溉保证率、有机质、p H、碱解氮、速效磷、速效钾、有效锌。通过模糊评价法获取单因素指标评语,通过层次分析法获得单因子指标权重,计算耕地地力综合指数,采用累积曲线法将研究区域地力等级分为5级,并绘制耕地地力等级分布图。

In this paper, Xifeng county, Tieling city of Liaoning Province taken as the research object, it carried on the investigation and analysis of the current situation of this regional soil nutrient characters of topsoil, physical and chemical properties of topsoil, site conditions and soil management etc., combined with the ＂3S＂ technology, evaluated fertilized land fertility in this region using AHP method and Delphi method, comprehensively considered soil, management and terrain features etc. in research area, collected relevant maps, data of each county, established land resources database, the selected evaluation unit is based on land use status of cultivated land, the selected evaluation factors of topography slope, slope structure, rock outcrop rate, effective soil depth, soil texture, drainage capacity, the guaranteed rate of irrigation, organic matter, pH, alkali-hydrolyzale nitrogen, P205, K20 and available Zn. In the paper, comment in the single factor index was obtained by fuzzy evaluation method, single factor index weight was obtained by AHP and the comprehensive index of cultivated land fertihty was calculated, fertility levels in research area were divided into five levels by the cumulative curve method, and the grades of cultivated land fertility distribution map was draw.