GIS based study on the potential grain productivity of China

On the basis of previous research results about potential agricultural productivity, the potential grain productivity of China is studied supported by GIS and national agricultural databases which include spatial database and attribute database. At first, the basic theory of potential grain productivity and the method of GIS based study on the potential grain productivity is discussed. Then, after the stressed research on soil effective coefficient, social effective coefficient, the authors put forward some new computing models and calculated China´s national potential grain productivity by county unit. Finally, the predominance of exploiting potential grain productivity regions of China is determined through comparing the calculated theoretical results with current grain productivity