摘要
在地理信息系统(GIS)技术的支持下,根据陕西省各市、县的统计资料,分析了陕西省从上世纪50年代以来耕地和人口的相对变化率空间分布,并利用区域重心的概念及模型,计算出1953年至2005年主要年份的耕地重心及人口重心坐标,得到两者动态演变轨迹,对其变化趋势进行对比分析。结果显示,陕西省耕地和人口各自空间变化区域差异显著,但变化分布格局大致相同,陕南地区相对变化较小,陕北地区和关中地区中部部分区域相对变化较大。52年来耕地分布重心向东北方向移动11.67 km,人口分布重心向东北方向移动17.35 km,两者整体走势相似,两重心之间的距离推近了6.29 km。耕地面积与人口总数之间相关度不大,但耕地分布与人口分布呈高度正相关,人口重心的移动是导致耕地重心移动的主要原因之一。
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 last 50 years are discussed based on GIS technology. Taking the conception and model of the regional gravity center and adopting the data collecting from 1953 to 2005, 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 culti- vated 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.
出处
《干旱地区农业研究》
CSCD
北大核心
2008年第3期216-221,共6页
Agricultural Research in the Arid Areas
基金
国家自然科学基金(40371003)
陕西师范大学研究生培养创新基金项目
关键词
耕地重心
人口重心
动态演化
cultivated land gravity center
population gravity center
developing evolvement
