呼和浩特城市空间扩展与生态安全演变耦合研究

THE COUPLING RELATIONSHIP BETWEEN URBAN EXPANSION AND ECOLOGICAL SECURITY EVOLUTION IN HOHHOT

在对呼和浩特城市空间扩展特征进行分析并构建其生态安全评价模型的基础上,运用灰色关联分析模型,定量分析呼和浩特市1990~2014年城市空间扩展与生态安全演变的耦合关联度。结果表明:(1)呼和浩特城市空间扩展迅速并具阶段性特征;(2)呼和浩特市生态安全从中等水平下降到较差水平;(3)呼和浩特城市空间扩展与生态安全演变有较强的耦合作用,其中对生态安全演变影响最显著的指标是分形维数,其次分别为人类干扰指数、紧凑度和扩展强度指数;(4)呼和浩特城市空间扩展与生态环境演变的耦合阶段长期处于颉颃时期,二者的耦合机理表现为城市空间扩展对生态环境的胁迫作用及生态环境对城市空间扩展的约束作用两个方面。

Based on analysis of the urban spatial expansion characteristics of Hohhot and the construction of its Pressure-State-Response model（ PSR）,this paper makes quantitative analysis on the coupling between the urban expansion and the ecological security evolution from 1990 to 2014 in Hohhot through the grey relational analysis model. The results show that,（ 1） the urban expansion of Hohhot gets rapid development and embodies periodical characteristics;（ 2） the ecological security of Hohhot decreases from a moderate level to a lower level;（ 3） the urban expansion of Hohhot has a strong coupling effect with the ecological security evolution,and the most significant indicators for the ecological security evolution are fractal dimension,followed by human disturbance index,compactness ratio and land expansion intensity index;（ 4） the coupling between urban expansion and ecological environment evolution in Hohhot remains antagonism for a long term,and their coupling manifests such two aspects as the stressing effect of the urban spatial expansion on the ecological environment as well as restraint function of the ecological environment on the urban expansion.