生态脆弱区土地综合承载力时空差异分析——以榆林市为例

发布时间：2018-08-11 15:41

【摘要】：以生态脆弱区的典型城市榆林市为例,从社会、经济、水土资源、科技、生态环境5个承载系统共选取30个指标,并利用AHP决策分析法与熵权法的组合权重确定各评价指标权重,分析了1990—2012年榆林市土地综合承载力的时空变化,并得出了各县区土地综合承载力的限制因子,结果表明:(1)1990—2012年期间,榆林地区土地综合承载力呈波动上升趋势,且各县区域土地综合承载力差异较大。(2)1990年时,榆林各县土地综合承载力都处于严重超载和临界超载的状态,最大值为绥德县,最小值为横山县;2000年时,土地承载力有了不同程度的增加,但是增幅不大,最大值为榆阳区,最小值为横山县;2012年时,各县土地综合承载力有了很大的提高,最大值为神木县,最小值为佳县。(3)各县区的土地综合承载力的限制因子差别较大。在1990年时限制因子主要是科技系统;到2000年时,限制因子主要是经济系统;到2012年时,限制因子主要是水土资源和科技系统。因此,榆林市应以保护环境和发展科技为关键,带动和维护社会,经济等的协调发展。
[Abstract]:Taking Yulin City, a typical city in the fragile ecological region, as an example, 30 indexes were selected from 5 carrying systems of society, economy, soil and water resources, science and technology, and ecological environment. The combined weight of AHP decision analysis method and entropy weight method is used to determine the weight of each evaluation index, and the temporal and spatial changes of the comprehensive land bearing capacity in Yulin City from 1990 to 2012 are analyzed, and the limiting factors of the comprehensive land bearing capacity in each county and district are obtained. The results are as follows: (1) during the period of 1990-2012, the comprehensive land bearing capacity of Yulin area showed a fluctuating upward trend, and the regional comprehensive carrying capacity of each county varied greatly. (2) in 1990, the comprehensive land bearing capacity of each county in Yulin was in the state of serious overloading and critical overload. The maximum value is Suide County, and the minimum value is Hengshan County. In 2000, the land bearing capacity increased to varying degrees, but the increase was not significant. The maximum value was Yuyang District, and the minimum value was Hengshan County. In 2012, the comprehensive land bearing capacity of each county was greatly improved. The maximum value is Shenmu County and the minimum value is Jiaxian. (3) the limiting factors of the comprehensive land bearing capacity of each county area are quite different. In 1990, the limiting factors were mainly scientific and technological systems; in 2000, the limiting factors were mainly economic systems; in 2012, the limiting factors were mainly soil and water resources and scientific and technological systems. Therefore, Yulin City should protect the environment and develop science and technology as the key to promote and maintain the coordinated development of society and economy.
【作者单位】：陕西师范大学旅游与环境学院;西北国土资源研究中心;
【基金】：国家自然科学基金(41371523) 教育部人文社会科学重点研究基地项目(14JJD840004)
【分类号】：F301.24

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