| Analysis of the spatial change of cultivated land and population in Shaanxi Province based on GIS |
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| DOI：10.7606/j.issn.1000-7601.2008.03.43 |
| Key Words: cultivated land gravity center population gravity center developing evolvement |
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| Abstract: |
| According to the statistical and survey data at provincial and county levels the relative change index of the cultivated land and population in Shaanxi Province during the last50years are discussed based on GIS technology．Taking the conception and model of the regional gravity center and adopting the data collecting from 1953to2005 the cultivated land and population gravity centers are calculated and their dynamic evolvement is analyzed．At the same time contrastive analysis is made of the dynamic evolvement tendencies of the two gravity centers．The results showed that the differences of spatial changes between cultivated land and population in Shaanxi Province are significant．However the change distribution pattern is basically identical．There is little relative change in southern Shaanxi while it is volatile in northern Shaanxi and central Shaanxi plain．The cultivated land gravity moves 11．67 km to northeast during the past 52 years and the population gravity moves 17．35 km to northeast．The whole trends of them are alike and the distance between two canters of gravity pushes 6．29 km close．Relevance degree is not big between cultivated area and population but the distributions of cultivated land and the population are to be highly related．The movement of the population gravity is one of the main reasons which cause the movement of the cultivated land gravity. |