黑土区耕地地力综合评价研究

The research of productivity evaluation of cultivated land in black soil rgion

耕地地力的变化对粮食生产、生产力等具有重要的影响,黑土是东北地区重要的土壤资源,黑土耕地面积占东北区总耕地面积的18 08%,但常年粮食总产量占全区粮食总产量的28 1%,占全国粮食总产量的7 8%,具有十分重要的地位[1],但是由于掠夺式的经营,导致黑土不断退化。在分析了德惠市耕地地力等级评价因子的基础上,利用RS和GIS建立了耕地资源数据库,确定了每个评价因子的权重,并利用层次分析法,进行耕地地力的评价,最后利用耕地地力综合评价等级指数确定耕地的级别,为黑土区耕地退化治理和耕地的可持续利用与管理提供决策依据。图1,表1,参9。

Productivity change of cultivated land has important influence to food production and land productivity.Black soil is an important soil resource in Northeast.The area of the cultivated land in black soil region is 18.08% of the area of cultivated land in Northeast, but the food production is 28.1% of the food production of Northeast, and is 7.8% of the whole country.So the black soil has important position.Because of immoderately management, black soil is gradually degrading.Based on RS and GIS, multifarious factors of cultivated land evaluation are analyzed, and the database of cultivated land in Dehui city is set up.The weight of evaluating factors is obtained and the productivity of cultivated land is evaluated using the method of analytical hierarchy process (AHP).According to the indexes of evaluating factors, the grades of cultivated land arc obtained.As a result, decision-making foundation is provided for the management of black soil degrading and continuous development of black soil.