Evaluation of cultivated land suitability for Binhai New Area of Tianjin based on GIS

Cultivated land is an essential resource and condition for the survival of human beings .Evaluation of cultivated land suitability is the basis of the land reasonable utilization and can provide the scientific basis for utilization and management of cultivated land .Taking Tianjin Binhai New Area as the study object and based on the theory of cultivated land suitability , the authors confirmed the evaluation unit with combinations of GIS and RS .5 evaluation factors were selected including soil geology and irrigation to build up the evaluation system with combinations of specific situations of Binhai Xin Area and the availability of data .Then the results of cultivated land suitability were divided into four levels based on GIS and weighted index summation model .The result showed that each level accounted for 5.65%, 27.25%, 44.42%, 22.68% of the total evaluation unit area respectively from level Ⅰto level Ⅳ.The whole quality of cultivated land is not very good .The highly suitable regions are mainly distributed in Taiping Town , Xiaowangzhuang Town , Zhongtang Town , north of Airport Economic Zone , Hujiayuan Street , Xincheng Town , Chadian Town , Datian Town , Hexin Street and Yangjiabo Town .The authors put forward some advices for each level land of evaluation result based on the results of each index evaluation , which are very important for improving cultivated land quality of the whole Binhai New Area and using land reasonably and availably .