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《Scientia Geographica Sinica》 2009-04
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Changing Regional Differences of Grain Productivity in China

FANG Xiu-qi1,YIN Pei-hong1,2,Feng-dong Chen1(1.School of Geography,Beijing Normal University,Beijing,100875;2.Policy Research Center for Environment and Economy of State Environmental Protection Administration,Beijing,100029)  
Based on the statistic data of agriculture in county-resolution for the time period of 1985-1987 and 2002-2004,the changing regional distribution of grain productivity in China in recent 20 years has been examined in this paper.It is found that,1) grain productivity indicated by grain yield per unit cropland has increased in most parts of China,especially in the west to the farming-grazing transitional zone,which has played more important role on total grain yield increase in the past 20 years in China.2) the differences of a grain productivity dominated by rainfall between the eastern and western China have remained obviously up till now.But the south-north difference of grain productivity dominated by temperature in the eastern China has reduced for the sensitive increase in grain productivity in the northern China.The lowest grain productivity zone is located in the farming-grazing transitional zone where the precipitation is 250-400 mm.East to the lowest zone,grain productivity has raised gradually from the northwest to the southeast which may be divided in higher grain productivity zone and the highest grain productivity zone.But the gradation of grain productivity in the east became less obvious in the period of 2002-2004.West to the lowest zone,named the lower grain productivity zone,the relative increase of grain productivity was faster than that in the lowest zone and east to the lowest zone.3) The area of cultivated land has expanded obviously in the western China,where the grain productivity is lower but increased fasty.While high quality cultivated lands reduced.There are positive impacts of climate change on the increase of grain productivity in Gansu and Xinjiang region,the middle-east of Inner Mongolia and Northeast China,where the temperature has risen significantly and the precipitation in most regions of western China has increased slightly in recent 20 years.4) The regions,of which the grain productivity ranks the top and bottom in China,both have the higher decrease of the cultivated land and the multi-cropping index as well.The average annual decrease of multi-cropping index is more than 1%-2%.The reduction of multi-cropping index went with the decrease of the cultivated land in the middle-down stream and the southward region of the Changjiang River of the highest grain productivity region implies the lost of the highest quality cultivated lands and the increase of food security risk.While in the lowest grain productivity region,especially in ecological sensitivity regions,such as the region along the Great Wall and the western Sichuan,the implement of the policies for recovering forest and grass in the cultivated land is attributed to the decrease of cultivated lands and it would benefit to ecosystem health and soil protection.
【Fund】: 十一五科技支撑项目(2007BAC03A11);; 自然科学基金项目资助(项目号:40571165)
【CateGory Index】: F323.211
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