Based on the data from the Cost-benefit Data of Farm Produce and the China Agricultural Yearbook,this paper aims to examine the spatial and temporal change characteristics of total grain production and its affecting f...Based on the data from the Cost-benefit Data of Farm Produce and the China Agricultural Yearbook,this paper aims to examine the spatial and temporal change characteristics of total grain production and its affecting factors.The results show that:1) During 1980 to 2007,total grain production increased from 3.20 × 108 t to 5.02 × 108 t in China,with annual increasing rate of 1.68%.From the regional disparities,most of the regions present increasing trend of total grain production except for several regions with higher level of economic development;2) Grain sown area decreased from 1.17 × 108 ha in 1980 to 1.06 × 108 ha in 2007,which has negative effect on total grain production;3) The increase of grain yield per unit area caused by land use intensity changes contributed to the increase of total grain yield greatly.However,as the land use intensity showed that farmers pay more attention to labor-saving input but not yield-increasing input,the less enthusiasm of farmers in grain production may become an important constraint on fu-ture grain production increase in China;4) Based on the results,this paper proposed different land management poli-cies in different regions,for example,the government should protect cultivated land,promote large scale production.As to the less developed regions,the government should pay more attention to agricultural subsidies to promote farm-ers' enthusiasm in grain production.展开更多
According to the data of the second national land survey,the farmland area of China at the end of 2009 was 200 million mu more than the original statistical data.This raises widespread concern.Analysis is carried out ...According to the data of the second national land survey,the farmland area of China at the end of 2009 was 200 million mu more than the original statistical data.This raises widespread concern.Analysis is carried out from the perspective of task,technique,necessities and effect on China's grain security of the second national land survey.Through analysis,it can be deemed that data of the second national land survey are reliable.It overcomes defects of traditional survey projects and will be of profound significance for grasping current situations of farmland resources in China.Farmers are grain production entities,while the grain yield survey of farmers is calculated through sampling survey of per unit area yield and the sown area.Therefore,the increase in farmland area may indicate underestimation of the grain yield,and the grain security risk of China will decline accordingly.展开更多
基金Under the auspices of National Natural Science Foundation of China (No. 40971062)China Postdoctoral ScienceFundation (No. 20100480441)
文摘Based on the data from the Cost-benefit Data of Farm Produce and the China Agricultural Yearbook,this paper aims to examine the spatial and temporal change characteristics of total grain production and its affecting factors.The results show that:1) During 1980 to 2007,total grain production increased from 3.20 × 108 t to 5.02 × 108 t in China,with annual increasing rate of 1.68%.From the regional disparities,most of the regions present increasing trend of total grain production except for several regions with higher level of economic development;2) Grain sown area decreased from 1.17 × 108 ha in 1980 to 1.06 × 108 ha in 2007,which has negative effect on total grain production;3) The increase of grain yield per unit area caused by land use intensity changes contributed to the increase of total grain yield greatly.However,as the land use intensity showed that farmers pay more attention to labor-saving input but not yield-increasing input,the less enthusiasm of farmers in grain production may become an important constraint on fu-ture grain production increase in China;4) Based on the results,this paper proposed different land management poli-cies in different regions,for example,the government should protect cultivated land,promote large scale production.As to the less developed regions,the government should pay more attention to agricultural subsidies to promote farm-ers' enthusiasm in grain production.
文摘According to the data of the second national land survey,the farmland area of China at the end of 2009 was 200 million mu more than the original statistical data.This raises widespread concern.Analysis is carried out from the perspective of task,technique,necessities and effect on China's grain security of the second national land survey.Through analysis,it can be deemed that data of the second national land survey are reliable.It overcomes defects of traditional survey projects and will be of profound significance for grasping current situations of farmland resources in China.Farmers are grain production entities,while the grain yield survey of farmers is calculated through sampling survey of per unit area yield and the sown area.Therefore,the increase in farmland area may indicate underestimation of the grain yield,and the grain security risk of China will decline accordingly.
