Cultivated land requisition-compensation balance by class conversion based on outcome of farm land classification

Over the past decades in China, the situation of farmland protection was not optimistic with economic and social overall development and acceleration of urbanization process. Some problems have been existing in the work of farmland requisition- compensation that quantity and quality of compensated land is poorer than that of requisition. Farmland classification was applied to ensure the quantity and quality of supplemental farmland and to solve the problem of national food security. Take Hubei Province as an example, the results of farmland natural quality were taken as data source and established a basic database with farmland natural quality index and areas which were based on the representative samples by stratified sampling method. Based on that research, quantity-quality convert method of supplementary farmland was studied. Average natural quality classification index was calculated by area-weighted mean model, then, conversion index calculation model was established. Finally converted relationship table for each grades of farmland was established, which can obtain the requisition-compensation balance in provincial level. The table provided theoretical basis for strict farmland management and farmland requisition-compensation balance.