【摘要】 以宁夏贺兰山为研究对象,基于VSD模型从暴露、敏感、适应三方面构建指标体系,通过SERV模型进行生态脆弱性评估,定量测度了1988和2013年国家级自然保护区建立前后宁夏贺兰山生态脆弱性的时空格局。结果表明:保护区建立25年后,宁夏贺兰山生态脆弱性明显降低,生态脆弱性分级指数从7.4下降至5.3,区域生态环境由原先的强度脆弱为主降低为中度脆弱。空间上来看,生态脆弱性整体呈现中部高四周低的分布格局。其中极度和重度脆弱区大范围减少,主要转化为中度和轻度脆弱区,但仍有部分中度和轻度脆弱区转化为极度和重度脆弱区。本研究有助于全面掌握宁夏贺兰山的生态脆弱程度及时空分异特性,对识别关键脆弱环境因子、提高生态环境治理具有重要意义。更多还原

【Abstract】 The index system was built to assess the vulnerability of spatial and temporal pattern before and after the establishment of national nature reserve in 1988 and 2013 by taking Helan Mountain of Ningxia as the case area. The index system was based on VSD model from three aspects of exposure, sensitive and adaptive capability, and regional ecological vulnerability assessment was developed from SERV model. The results showed that: the ecological vulnerability was reduced significantly after the establishment of the National Nature Reserve for 25 years. The ecological vulnerability classification index decreased from 7.4 to 5.3, and regional ecological environment was recovered from mainly severe vulnerable to moderately vulnerable. According to the spatial distribution, the ecological vulnerability distribution pattern showed that the vulnerability index was high in central and low around. The extreme and severe vulnerable areas were largely reduced,mainly into moderate and mild areas. But there were still some moderate and the mild areas being extreme and severe vulnerable areas. This study benefited to understand comprehensively the ecological fragile degree and the tempo-spatial distribution characteristics of the Helan Mountain of Ningxia. It was of great significance to identify key environmental factors and improve the ecological environment governance.更多还原