生态环境学报2023，Vol.32Issue(10)：1760-1770,11.DOI:10.16258/j.cnki.1674-5906.2023.10.005
岷江上游生态脆弱性时空分异及驱动因子交互效应分析
Spatial and Temporal Differentiation of Ecological Vulnerability and Interaction Effects of Driving Factors in the Upper reaches of the Minjiang River:A Case Study of the Zagunao River Basin
摘要
Abstract
The upper reaches of the Minjiang River play a vital role in ecological protection in China.The devastating earthquake on May 12,2008 had a profound impact on the ecological environment in this region,particularly in the vulnerable arid valley areas that are major human activity zones.To better understand the changes in the ecological environment after the earthquake and explore the driving forces behind ecological vulnerability in this region,this study focuses on the Zagunao River Basin as a case study.Four dimensions,namely"natural environment,geology and landforms,geological hazards,and social environment"were used to select 14 evaluation indicators.Spatial principal component analysis was employed to assess the ecological vulnerability of the area before the earthquake(2001),after the earthquake(2009),and in the current state(2020).Geodetector analysis was used to examine the factors influencing ecological vulnerability,and the ratio of interactive effect variation was calculated to evaluate the individual and interactive effects of driving factors.The results showed that compared to the pre-earthquake and post-earthquake periods,the areas of potential and moderate vulnerability within the region decreased,while the areas of mild,mediumly severe and severe vulnerability increased,indicating an exacerbation of ecological vulnerability.However,over the years of recovery,the areas of potential,mild,and moderate vulnerability increased,while the areas of mediumly severe and severe vulnerability decreased to some extent,indicating a reduction in ecological vulnerability.The regions with the highest ecological vulnerability were the Minshan Mountain and Qionglai Mountain ice erosion and ice edge of the alps and extra-high mountain areas,with mild and severe vulnerable areas accounting for 25.8%and 36.3%of the total area,respectively,indicating a relatively high ecological vulnerability.In the arid valley area,the most widespread distribution was observed in the mild and moderate vulnerability areas,accounting for 46.6%and 33.9%of the total area,respectively,indicating a relatively high ecological vulnerability.In other regions,the potential vulnerability areas accounted for more than 74.5%of the total area,indicating a low ecological vulnerability.Elevation,biological abundance index,vegetation coverage,water conservation index,and drought index were identified as the main driving factors contributing to ecological vulnerability in the region.Among these,elevation had the most direct impact,while vegetation coverage and water conservation index exhibited continuously strengthening indirect impacts on ecological vulnerability.During dry climate periods,the drought index directly influenced ecological vulnerability,and the biological abundance index had a significant direct impact,with its indirect impact on the area's ecological vulnerability increasing after the earthquake.This study provides valuable insights for ecological protection and restoration in the Zagunao River Basin.关键词
生态脆弱性评价/驱动因子/交互效应变异比/地理探测器/干旱河谷区/杂谷脑河流域Key words
ecological vulnerability assessment/driving factors/interaction effect variation ratio/arid valley area/Geodetector/Zagunao River Basin分类
天文与地球科学引用本文复制引用
肖成志,计扬,李建忠,张志,巴仁基,曹亚廷..岷江上游生态脆弱性时空分异及驱动因子交互效应分析[J].生态环境学报,2023,32(10):1760-1770,11.基金项目
中国地质调查局地质调查项目(DD20220955) （DD20220955）
