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《Journal of Geo-Information Science》 2010-05
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The Effects of Cultivated Land Change on Regional Potential Productivity in China from 2005 to 2008

CHENG Chuanzhou1,2,YANG Xiaohuan1,LI Yuejiao1,2,JI Yinxiao3 (1.Institute of Geographic Sciences and Natural Resources Research,CAS,Beijing 100101,China;2.Graduate University of Chinese Academy of Sciences,Beijing 100049,China;3.China University of Mining & Technology,Beijing 100049,China)  
With a large population and a relatively less cultivated land,China's food security has always been a top priority for the country.For cultivated land resources and grain productivity are the basis for food security,researches that focus on effects of cultivated land change on grain potential productivity in China are of great practical significance and can provide scientific grounds for relevant national decision-making.This study,based on latest meteorological observation data and satellite retrieval data from 2005 to 2008,and on quantitative change and quality characteristics of cultivated land resources,combining cultivated land data and change data in 2005 and 2008,focuses on the effects of cultivated land change on light-temperature potential productivity in China from 2005 to 2008.The results showed that: productions of light-temperature potential productivity have both increased zone and reduced zone in the process of cultivated land change.There is non-equivalence of yield variation in increased zone and reduced zone,as increase of 7.8514 million tons in increased zone and reduction of 25.4361 million tons in reduced zone,resulting to a net decrease of 17.5847 million tons.There also is non-equivalence of per unite yield in increased zone and reduced zone,as average values of light-temperature potential productivity are 11.89 t/hm2 in increased zone and 20.99 t/hm2 in reduced zone.The later is almost 2 times more than the former.Increased zone and reduced zone have different spatial distribution: increased zone mainly distributed in Xinjiang,Heilongjiang,Inner Mongolia,Ningxia,Qinghai provinces/autonomous regions,i.e.northwest and northeast of China,and ecological land reclamation is the main reason of its increase,accounting for 77.25%.Reduced zone mainly distributed in Jiangsu,Anhui,Shandong,Guangdong provinces,in other word,the Yellow River-Huaihe River-Haihe River Plain,the Yangtze River Delta and the Pearl River Delta areas,where farmland transferred to construction land is the main reason of its reduction,accounting for 69.20%.
【Fund】: 中国科学院知识创新工程重大项目(KSCX1-YW-09-01)
【CateGory Index】: F323.211
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