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| Spatial-temporal dynamic change of grain productionunder county scale in Northeast |
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| Abstract: |
| In order to reveal the spatial heterogeneity of grain output in Northeast China，based on the GIS
technology，ESDA and gravity center model，the spatial and temporal characteristics of grain production in
Northeast China in 2000-2012 were studied. The results showed that，from the spatial-temporal pattern，the
average grain yield showed an increasing trend and gradually moved to the high county and northeast direction
from 2000 to 2012 in Northeast China；grain yield of the majority of county was lower than the average yield，but
the number of county with high grain yield increased year by year. The county grain yield had significant spatial
autocorrelation and the spatial difference was relatively large，the gravity of grain production showed devation，
shifted to the southwest with 51.84 degrees from 2000 to 2003，the grain center moved to the northeast，southwest
of Jilin Province，Liaoning Province，North Central and northwest of Heilongjiang Province from 2006 to 2012，the
total grain output increased from 2000 to 2012. The gravity moving rate of Northeast grain output center gradually
decreased，the space fluctuation of grain production decreased slowly，the dominant regiona of grain production
tended to be the stable，the change of center of gravity movement made the spatial distribution of grain yield
changed significantly. |
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