Evolutionary characteristics and coupling of the global economic-population-grain center of gravity in the last 60 years
Based on the center of gravity and coupling analysis model,we calculate the spatial pattern and evolution characteristics of global economic,population and grain centers of gravity from 1960 to 2020,and analyze their coupling relationships and influencing factors.The results show that:(1)The centers of gravity of all three groups are obviously biased toward the northern hemisphere,which is closely related to the global distribution of land and sea,and the northern hemisphere has a larger land area and superior natural conditions than the southern hemisphere.The economic center of gravity is located in the northwest of the geometric center(0°,0°),and the grain and population centers of gravity are located in the northeast of the geometric center;(2)The economic center of gravity moves eastward rapidly and with a large magnitude;the popu-lation center of gravity mainly moves from northwest to south,from northwest to southeast be-fore 1990,and from northeast to the southwest after 1990,with a smaller movement;the grain center of gravity has a large jump and is the most unstable,and the regularity is not obvious;(3)The economic and grain centers of gravity are highly coupled;the grain and population centers of gravity are coupled,but not significantly;the economic and population centers of gravity are lowly coupled but in a gradually increasing state.
evolutionary characteristicscoupling relationshipseconomic center of gravitygrain center of gravitypopulation center of gravity
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