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《Transactions of the Chinese Society of Agricultural Engineering》 2010-04
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Physical suitability evaluation of reserve resources of cultivated land in China based on SOTER

Zhang Ganlin,Wu Yunjin,Zhao Yuguo (Institute of Soil Science,Chinese Academy of Sciences,State Key Laboratory of Soil and Sustainable Agriculture,Nanjing 210008,China)  
Physical suitability evaluation of reserve resources of cultivated land provides a scientific basis for reasonable exploitation and utilization of these lands aiming to ensure food supplies of China.Taking the whole reserve resources of cultivated land in China as the evaluation object based on 1:1000000 scale SOTER of China,nine factors of climate, landform and soil were adopted,fuzzy analysis combined with the Delphi method were used to quantify the membership functions of the selected factors and the weight contributions of individual factors were determined using the Delphi method and an analytic hierarchy process(AHP).Physical suitability indices of each evaluation unit were calculated by using the combination method of critical conditions with integrated index model,and then the suitability grades were classified.Evaluation results showed that about 56.6×10 4 km 2 reserve resources of cultivated land had suitable physical quality,among which grade 1,2,3,4,5 accounted for 15.9%,19.5%,25.8%,19.1% and 19.7%,respectively. Heilongjiang,Jilin,Liaoning,Shanxi.Hebei,Guizhou,Guangxi,Shandong and Jiangxi provinces could be the main areas for exploitation of reserve resources of cultivated land.With the decrease of suitability grade of reserve resources of cultivated land,the most serious limited factor changed from soil condition to climate and landform conditions.Fuzzy functions and the combination of critical conditions with integrated index model can improve effectively the rationality of evaluation result.
【Fund】: 中国科学院知识创新工程方向性项目(KZCX2-YW-409);; 江苏省科学基础项目(BK2008058);; 国家自然科学基金项目(NSFC40771092)
【CateGory Index】: S159.2
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