Understanding cultivated land dynamics and its driving forces in northern China during 1983-2001

摘要

Based on the long-term serial NOAA/NDVI dataset during 1983-1999 and SPOT/VGT datasetin 2001,the land use/cover change information in the 13 provinces of northern China was extracted based on the analysis ofthe cultivated landscape characteristics atfirst,then the effects of human activitieson cultivated land processwere explored by GIS and the driving forcesofcultivated land change were investigated.The conclusionscan be drawn asfollows:(1)The constantincrease of weak ecologicalfunction land asdesertand cultivated land and the decrease ofthe ecologicalfunction land offorestand shrub were the main characteristicsofthe land use/coverchange in the 13 provinces from 1983 to 1999,which showed the effects on the ecologicaladjustmentfunction.However,such situations were changed to some extentin the 2000s because of the eco-construction policy of the government.(2)From 1983 to 2001,the Barycenterofcultivated land tended to move from northeast to southwest with the topography and transportation situations being the main influences on the cultivated land distribution.Itis found thatthe cultivated land use intensity decreased noticably with the increase ofdistance from the main communication arteries.(3)The improvementofthe people’s living standard is closely related with the cultivated land change.The structural adjustment in the agriculturalland caused by economicdevelopmentand the improvementofthe people’sliving standard isan importantfactoraffecting thecultivated land changein northern Chinafrom 1983 to 2001.