基于GIS的宁夏压沙地生产力评价研究

宁夏中西部干旱地带,气候干旱,水资源匮乏,通过对压沙地生产力自然条件评价和社会经济指标评价综合评价压沙地的生产力,得出宁夏中卫压沙地评价区的综合评价指数SI模型,即SI=0.8PI+0.2TI。其中自然生产力的评价从土壤化学条件、土壤物理条件、土壤生态条件3方面,应用FAO提出的PI模型进行评价;社会经济条件评价从压沙地年限、水利化水平、化学化水平、农业机械化水平和耕地现有人口承载量5个方面,应用层次分析法,得出各个指标的影响权重,最后应用TI模型进行评价。

Study on Gravel-mulched Field Productivity Evaluation of Ningxia Based on GIS

In the west arid region of Ningxia,the climate is drought and the water resources is scarcity,the gravel-mulched field productivity is comprehensively evaluated through the natural conditions evaluation and social and economic index evaluation in this paper.And the SI model of evaluation index for gravel-mulched field of Zhongwei city of Ningxia is got,which is SI =0.8PI + 0.2TI.The natural productivity evaluation is from the three aspects,namely soil chemistry,soil physical conditions,and the conditions of soil ecological condition through the application of PI model proposed by FAO.The social and economic conditions evaluation is from the five aspects,namely the gravel-mulched field period,water level,practical level,agricultural mechanization level and population carrying capacity of cultivated land by using AHP to get the effect weight of each index and the application of the TI model.