通辽市耕地地力评价及养分分析

Evaluation of Cultivated Land Fertility and Analysis of Soil Nutrients in Tongliao City

以通辽市耕地为评价对象,基于GIS技术,将通辽市行政区划图、地貌类型图、土壤图以及土地利用现状图4种图件叠加而成的图斑作为评价单元,结合通辽市实际情况,选取立地条件、气象条件、剖面性状和状况等4个方面的12个指标作为耕地地力评价因子,采用层次分析法与模糊数学理论确定各评价因子权重和隶属度,计算地力综合指数,按照累积曲线法,将通辽市耕地划分为5个等级,并对耕地等级及其养分状况进行了分析.结果表明,一级地148235.27 hm^2,占耕地总面积的11.00%;二级地346662.33 hm^2,占耕地总面积的25.73%;三级地287693.46 hm^2,占耕地总面积的21.35%;四级地300719.55 hm^2,占耕地总面积的22.32%,五级地264037.75 hm^2,占耕地总面积的19.60%.从通辽市耕地养分状况来看,整体偏碱,各种养分含量总体处于中等偏下水平.

The cultivated land within Tongliao City was classified into five grades according to the integrated fertility index. Tongliao City administrative map,landform map,soil map and land use maps were superimposed map as the evaluation units,combined with 12 indexes from 4 aspects of site conditions,weather conditions,profile properties and as the status of cultivated land fertility evaluation factors. The fuzzy mathematics theory was used to determine the weights of evaluation factors and membership degrees by using the AHP method,calculating the integrated fertility index,according to the cumulative curve method. The cultivated land grade and its nutrient status were analysed.The results showed that the area of the first,second land,third,fourth and fifth-grade lands were 148235.27,346662.33,287693.46,300719.55 and 264037.75 hm^2,which accounts for approximately 11.00,25.73,21.35,22.32 and 19.60% of the total cultivated land areas respectively. The nutrient status of the cultivated land,was principally alkaline with nutrient levels in the middle and lower levels.