景观生态风险与植被覆盖度耦合视角下皖西生态屏障区敏感地带识别与分级保护OA
Sensitive area identification and hierarchical protection in the western Anhui ecological barrier zone from the coupling perspective of landscape ecological risk and vegetation coverage
[目的]系统评估皖西生态屏障区的景观生态风险格局,揭示其与植被覆盖度间的耦合协调关系,识别面向分级保护的关键敏感地带,为区域生态保护与修复提供依据.[方法]基于 2000和 2022年 2期归一化植被指数(NDVI)和土地利用数据,构建规则格网评价单元,采用干扰度-脆弱度综合框架计算景观生态风险指数,识别生态敏感地带;在此基础上,以植被覆盖度作为生态状态表征指标,构建耦合协调度模型,解析"风险-状态"双系统的协同演化特征.[结果]① 景观生态风险指数总体呈"南北高、中部低"的空间分布格局,2000-2022年,中、高等级风险区明显收缩并向低风险转化,共识别生态敏感地带约 6 572.17 km2.② 敏感地带内植被覆盖度以高覆盖为主,但整体呈下降趋势;NDVI均值由 0.883降至 0.823;低覆盖度区域显著扩展,主要分布于北部边界和南部局部区域.③ 耦合协调度总体下滑,优质协调区占比由 95.25%降至 83.67%,一般失调、中度失调和严重失调区范围扩大.综合识别需优先管控的关键区域 1 073.50 km2,其中一般保护区 872.94 km2、重点保护区 200.56 km2.[结论]皖西生态屏障区总体生态风险呈下降趋势,但敏感地带植被退化导致"风险-状态"协调性弱化.建议对 1 073.50 km2 关键区域实施分级保护和精细化修复,以支撑区域生态安全格局的稳定构建.
[Objectives]This study aims to systematically evaluate the spatial pattern of landscape ecological risk in the western Anhui ecological barrier zone,reveal its coupling coordination relationship with fractional vegetation cover(FVC),and identifies key sensitive zones for graded conservation,thereby providing quantitative evidence for regional ecological conservation and restoration.[Methods]Based on normalized difference vegetation index(NDVI)and land-use datasets for years 2000 and 2022,a regular grid evaluation unit was established.An integrated framework incorporating disturbance degree and vulnerability was applied to quantify the landscape ecological risk index(ERI)and identify ecologically sensitive zones.Building on this,using FVC as a proxy indicator of ecological condition,a coupling-coordination model(D)was constructed to analyze the synergistic evolution characteristics of the"risk-state"dual system.[Results]1)The ERI exhibited an overall spatial pattern of"higher in the north and south,lower in the central region".From 2000 to 2022,areas classified as medium-and high-risk zones significantly contracted and shifted toward low risk,resulting in the identification of approximately 6 572.17 km2 of ecologically sensitive zones.2)Within these sensitive zones,the FVC was predominantly high,yet exhibited an overall declining trend.The mean NDVI decreased from 0.883 to 0.823,and regions with low-cover expanded notably,primarily distributed along the northern boundary and localized southern areas.3)The overall coupling coordination degree(D)declined,with the proportion of"high-quality coordination"areas dropping from 95.25%to 83.67%,while the extents of mild,moderate,and severe discoordination expanded.Through comprehensive identification,a total of 1 073.50 km2 were delineated as priority management areas,comprising 872.94 km2 designated for general protection and 200.56 km2 for key protection.[Conclusions]Although the overall ecological risk in the western Anhui ecological barrier zone showed a decreasing trend,vegetation degradation within sensitive zones has weakened the coordination of the"risk-state"system.We recommend that the identified 1 073.50 km2 critical area be subjected to hierarchical protection and refined ecological restoration measures to support the stable establishment of a regional ecological security pattern.
黄银兰;余俊锋;杨益苹;陈实
池州学院地理与规划学院,安徽 池州 247000池州学院地理与规划学院,安徽 池州 247000池州学院地理与规划学院,安徽 池州 247000池州学院地理与规划学院,安徽 池州 247000
资源环境
皖西生态屏障区景观生态风险植被覆盖度敏感区识别分级保护
western Anhui ecological barrierlandscape ecological riskfractional vegetation cover(FVC)sensitive-zone identificationhierarchical conservation
《自然保护地》 2026 (2)
75-86,12
安徽省哲学社会科学规划项目(AHSKQ2022D024).
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