Estimation of farmland quality after rural residential land consolidation and its application

Rural residential land consolidation is recognized as an important way of farmland requisition-compensation balance, so the quantity and quality of supplementary cultivated land using the above way should be taken into account comprehensively. With the spatial analysis function of GIS and neighborhood replacement method, this paper took Pinggu district, Beijing as a case, to estimated the quality grade of restored farmland after rural residential land consolidation by using the method and data of farmland gradation. In order to optimize the current program of rural residential land consolidation planning（RRLCP）in Pinggu district, on the basis of the results researched above, the production capacity of supplementary farmland in RRLCP was calculated，the goal setting, spatiotemporal arrangement and key engineering projects in the process of making RRLCP and implementation of this program were discussed. The results showed that: the natural quality score of farmland after rural residential land consolidation was from 0.3910 to 0.9745, which was classified into five grades, and the floating range of realizable yield per-unit was 5769 to 12 758 kg/hm2 in Pinggu district. In RRLCP, the demolition area of rural residential land was 2 442.60 hm2, and the suitable area of restored cultivated land after rural residential land consolidation was 1922.07 hm2, including five grades with proportions of 12.75%, 21.69%, 40.54%, 15.36% and 9.66%, respectively. Accordingly, in RRLCP the?first-grade regions should be the priority areas in the near future, to promote farmland quality with the large-scale management and combination of utilization and nurturing. The second-grade regions should be the key region in medium term, to fertilize the soil and strengthen the irrigation-water conservation project construction. And the third-grade and the fourth-grade regions should be the suitable region in long term, to develop the neat project of land mainly and the ecological protection project?chronically in?mountainous area. This paper tried to apply the theory and results of farmland gradation to rural residential land consolidation research, in order to provide scientific instructions for practice and management in “double balance” of cultivated land requisition-compensation.