江西省县域人口垂直分布与耕地的相关性研究

Research on Correlation between Vertical Distributions of Population in Counties and Cultivated Land in Jiangxi Province

根据江西省1∶25万基础地理数据、SRTM_90数字高程数据和相关统计数据,运用Arcgis 9.2软件分析了1990～2007年江西省县域人口和居民点的垂直分布与耕地的相关性。结果表明:随着海拔的升高,人口和耕地数量下降、居民点规模逐渐缩小、居民点拥有的耕地数量下降;海拔高程和耕地面积与人口垂直分布的相关系数分别为0.85和0.95,说明影响人口垂直分布的主要因素是耕地,海拔高程通过影响耕地面积来影响人口分布,随海拔升高,人均耕地面积变化不大。

According to 1：250 000 basic geographic data, SRTM 90 digital elevation data and related statistical data, the correlation between the euhivated land and vertical distributions of population in counties as well as settlements in Jiangxi Province form 1990 to 2007 were analyzed by Arcgis 9.2 software. The results showed that with the increasing of elevation, the amounts of population and cultivated land were declined, scale of settlements was shrinking, and the euhivated land possessed by settlements was reducing. Correlation coefficient between elevation and vertical distributions of population was 0.85, and it was 0.95 between cultivated land and vertical distributions of population. It indicated that cultivated land was the main factors which influenced vertical distributions of population. Elevation influenced the distributions by influencing cultivated land. With the increasing of elevation, per capita cultivated land changed little.