榆林市生态环境质量变化趋势及空间分布特征分析

Assessment of Ecological Environment Quality Change and Its Spatial Distribution Pattern of Yulin City

运用层次分析法和空间分析法分析1996—2012年榆林市生态环境质量变化趋势和空间分布特征。结果表明:1996—2012年榆林市生态环境质量呈波动下降趋势,分别在2001、2004、2012年出现了转折,生态环境总体呈恶化趋势较明显;生态环境质量各维度具有明显的差异性。自然条件榆阳区最优,衡山县最差;生态条件吴堡县最好,定边县最差;社会经济发展对生态环境的压力和影响吴堡县最小,神木县最大;环境污染程度清涧县最小,神木县污染最严重;生态环境质量具有空间差异性,呈中部高,西南和东北低的格局,清涧县最好,神木县最差。

Ecological environment quality change and its spatial distribution pattern of Yulin City is studied based on the AHP and spatial analysis, during 1996—2012. The results show that： During1996—2012, the ecological environment quality has fluctuating downward trend deterioration, and the ecological environment deterioration significant. The quality of the four dimensions of ecological environment has significant differences. Natural conditions in Yu yang District is optimal, while those in Hengshan County is worst; ecological conditions in Wubu County is best, Dingbian County worst; Social and economic development pressures Wubu is minimum, Shenmu is maximum; environment pollution Qingjian County is smallest, Shenmu County is most polluted. Ecological environment quality has a spatial differences, central of the area is higher, while southwest and northeast are lower. Qingjian county has a best ecological environment quality, Shenmu county is worst.