The Spatio-temporal Variation of Benefit of Cultivated Land Use Based on GIS Technology in Hunan Province
用层次分析法评价湖南省过去20年耕地利用效益变化，发现经济和效益上升但生态效益下降，空间差异大，高效益区集中在洞庭湖平原和东部丘陵。
Analytic hierarchy process(AHP) was applied for quantitative evaluation the benefit of cultivated land use in Hunan province.The changes of benefit index of cultivated land use during the past 20 years were analyzed.Geographical information system(GIS) was applied to research the spatial variation characteristics of benefit of cultivated land use in Hunan province.The result found that the economic benefit and social benefit of cultivated land use in Hunan province showed a growth tendency while the ecological benefit showed a downward trend.The spatial variation of benefit of cultivated land use was large in Hunan province,and the regions with higher comprehensive benefits main centralized at ring zone of dongting lake plain area and the eastern hilly area of Hunan province.The comprehensive benefits of cultivated land use should be advanced and the agriculture should be developed with balance in every region in the province.In order to realize the coordinated growth of economic benefit,social benefit and ecological benefit,the increasing chemical fertilizer usage should be controlled and the effective irrigation area of cultivated land should be increased and the utilization of land resources should be improved.