基于SRP模型的石羊河流域生态脆弱性评价

Ecological vulnerability assessment of Shiyang River basin based on SRP model

随着社会经济的快速发展,各地区生态环境脆弱性日益显现。文中通过SRP概念模型构建石羊河流域生态脆弱性评价指标体系,利用遥感和GIS技术,采用主成分分析法,系统、定量地对石羊河流域2005、2010、2015年生态脆弱性进行评价。结果表明:1)受自然因素和人为因素共同影响,石羊河流域生态脆弱程度整体处于重度脆弱水平;2)空间上,石羊河流域生态脆弱性总体分布呈从上游到下游明显加重的趋势,重度脆弱面积和极度脆弱面积占总面积的比重较大;时间上,流域在2005~2015年间生态状况总体呈轻微转好的态势;3)石羊河流域生态脆弱性具有强烈的空间自相关特征。

With the rapid development of the social economy,the ecological environment vulnerability of various regions has become increasingly apparent.In this paper,the SRP conceptual model was used to construct the ecological vulnerability assessment index system for Shiyang River basin.Using the remote sensing and GIS technology,the principal component analysis method was used to systematically and quantitatively evaluate the ecological vulnerability of the Shiyang River basin in 2005,2010 and 2015.The results show that:①The ecological fragility of the Shiyang River basin was in a state of severe vulnerability.The formation of ecological fragility was the result of the combination of natural and human factors.②In terms of space,the overall distribution of ecological fragility in the Shiyang River basin was showed trend of obvious increase from the upstream.To the downstream,the severely vulnerable areas and extremely fragile areas accounted for a large proportion.In terms of time,the ecological status of the basin in the whole period of 2005-2015 showed a slight improvement.③The ecological vulnerability of the Shiyang River basin showed strong spatial autocorrelation characteristics.