In order to objectively and reasonably evaluate the actual and potential value of cultivated land, both social and ecological values are introduced into the classification and grading index system of cultivated land b...In order to objectively and reasonably evaluate the actual and potential value of cultivated land, both social and ecological values are introduced into the classification and grading index system of cultivated land based on the viewpoint of sustainable development, after considering the natural and economic values of cultivated land. Index system construction of the sustainable utilization of cultivated land should follow the principles of economic viability, social acceptability, and ecological protection. Classification of cultivated land should take into account the soil fertility of cultivated land. Then, grading of cultivated land is carried out from the practical productivity (or potential productivity) of cultivated land. According to the existing classification index system of cultivated land, the soil, natural and environmental factors in plains, mountains and hills are mainly modified in the classification index system of cultivated land. And index systems for the cultivated land classification in plains, mountains and hills are set up. The grading index system of cultivated land is established based on the economic viability (economic value), social acceptability (social value) and protection of cultivated land (ecological value). Quantitative expression of cultivated land grading index is also carried out.展开更多
Based on the introduction of the general situation of research region,pressure index model of cultivated land is adopted according to the data of population,cultivated land area,crop sowing area,grain sowing area,and ...Based on the introduction of the general situation of research region,pressure index model of cultivated land is adopted according to the data of population,cultivated land area,crop sowing area,grain sowing area,and unit grain yield in the Statistical Yearbook of Fengxian County.The change of relevant factors of cultivated land pressure index over time is analyzed,as well as the tension level of cultivated land resources.Research shows that the pressure on cultivated land is relatively great in Fengxian County in the years 1999-2005.Grain supply and demand is still under the unsafe state.There will be more prominent contradiction between supply and demand of cultivated land in Fengxian County in the future,and the grain security will under greater pressure.Several countermeasures are put forward to ease the pressure on cultivated land in Fengxian County,in order to realize the sustainable use of cultivated land resources,to ensure the supply and demand balance of grain and cultivated land,and to stabilize and improve the grain productivity in Fengxian County,such as protecting the current cultivated land resources by the strictest protection system of cultivated land,enhancing the intensity of land development and reclamation,enlarging the area of cultivated land,increasing the agricultural sci-tech input,and improving the grain unit yield.展开更多
基金Supported by the Key Project of Chinese Ministry of Education ( 108098)the National Natural Science Foundation of China ( 40671078,40771088)the Dangui Plan of Huazhong Normal University
文摘In order to objectively and reasonably evaluate the actual and potential value of cultivated land, both social and ecological values are introduced into the classification and grading index system of cultivated land based on the viewpoint of sustainable development, after considering the natural and economic values of cultivated land. Index system construction of the sustainable utilization of cultivated land should follow the principles of economic viability, social acceptability, and ecological protection. Classification of cultivated land should take into account the soil fertility of cultivated land. Then, grading of cultivated land is carried out from the practical productivity (or potential productivity) of cultivated land. According to the existing classification index system of cultivated land, the soil, natural and environmental factors in plains, mountains and hills are mainly modified in the classification index system of cultivated land. And index systems for the cultivated land classification in plains, mountains and hills are set up. The grading index system of cultivated land is established based on the economic viability (economic value), social acceptability (social value) and protection of cultivated land (ecological value). Quantitative expression of cultivated land grading index is also carried out.
基金Supported by the Key Project of the National Eleventh-Five Year Research Program of China(2006BAJ05A08)the Open Fund of Jiang-su Key Laboratory of Resources and Environmental Information Engineering(20080301)the Science Fund(Youth) of China Univer-sity of Mining & Technology(2006A030)
文摘Based on the introduction of the general situation of research region,pressure index model of cultivated land is adopted according to the data of population,cultivated land area,crop sowing area,grain sowing area,and unit grain yield in the Statistical Yearbook of Fengxian County.The change of relevant factors of cultivated land pressure index over time is analyzed,as well as the tension level of cultivated land resources.Research shows that the pressure on cultivated land is relatively great in Fengxian County in the years 1999-2005.Grain supply and demand is still under the unsafe state.There will be more prominent contradiction between supply and demand of cultivated land in Fengxian County in the future,and the grain security will under greater pressure.Several countermeasures are put forward to ease the pressure on cultivated land in Fengxian County,in order to realize the sustainable use of cultivated land resources,to ensure the supply and demand balance of grain and cultivated land,and to stabilize and improve the grain productivity in Fengxian County,such as protecting the current cultivated land resources by the strictest protection system of cultivated land,enhancing the intensity of land development and reclamation,enlarging the area of cultivated land,increasing the agricultural sci-tech input,and improving the grain unit yield.