陕西关中地区生态弹性计量模型与测算

An ecological elasticity measurement model and its calculation regarding Guanzhong area of Shaanxi province

关中地区是关中-天水经济区的主要部分,生态环境面临来自社会经济、自然环境等方面的压力,研究关中地区的生态弹性及其影响因素具有重要意义.通过GIS和RS技术,运用生态弹性度计算模型,测算了2000—2015年15a间陕西省关中地区的生态弹性度,分析了市区间生态弹性度和生态弹性动态度的时空特征;探讨了土地利用变化和植被净初级生产力对生态弹性度的影响.研究结果表明:关中地区生态弹性度总体在4~8,从2000年的4.17~7.67升至2015年的5.94~7.52,总体呈上升趋势,生态环境有所改善.区域生态弹性受土地利用方式和NPP的影响,其中林地对区域生态弹性的提高影响最大,草地、耕地次之.通过植树造林增加建成区植被覆盖面积,有益于改善区域生态环境,提高区域生态弹性度.

Guanzhong area is the main part of Guanzhong-Tianshui Economic Zone.The ecological environment is facing the pressure from the rapid development of social economy and the change of natural environment.It is of great significance to study the ecological elasticity of Guanzhong area and its influencing factors to the sustainable development of this region.This paper measures the change of ecological elasticity through the change of land use from 2000 to 2015,and analyzes the influence of land use change on ecological elasticity.Our results show that the ecological elasticity of Guanzhong area is between 4 and 8,rising from 4.17-7.67 in 2000 to 5.94-7.52 in 2015,Therefore,the overall trend is increasing,and the ecological environment is improved.The ecological elasticity is influenced by the way of land use and the NPP.The forest land has the greatest influence on the ecological elasticity of the area,followed by the grassland and arable land.The quality of regional ecological environment can be improved by afforestation and by increasing vegetation cover in the build up area.