摘要
This study focuses on the Pearl River Delta Urban Agglomeration(PRDUA)as the research subject,incorporates the vulnerability assessment framework of the human-earth system to optimize the Landscape Ecological Risk(LER)index assessment model,and spatially visualizes the vulnerability degree,landscape disturbance intensity,and optimized LER of PRDUA in the representative years of 2002,2007,2012,2017,and 2022.The contribution of ecological land restoration to the evolution of LER is measured using the factor detector and interaction detector results of the Geodetector.Four restoration indicators are selected:ecological land area,proportion,cohesion,and AI(Aggregation Index).The results show that:(1)Between 2002 and 2022,the vulnerability in PRDUA exhibited a decreasing trend,albeit with notable spatial disparities.Areas of low vulnerability predominantly lie on the periphery of PRDUA,whereas high vulnerability zones are concentrated within its core.(2)The change in LER and vulnerability is highly consistent.Between 2002 and 2022,the high-risk areas show a shrinking trend and are mainly located in Guangzhou,Foshan,Dongguan,and Shenzhen.Low-risk areas are mainly located at the edge of the PRDUA.(3)Based on the Geodetector,the contribution of single factor of ecological land restoration to LER change is low,and the contribution of two factor interaction is significantly enhanced,especially the cohesion and AI interactions contributed the most.In the period 2012-2022,the q-value of the explanatory power of the interaction between cohesion change and AI change reached 62.213%,which was the strongest explanation for changes in LER.These findings provide an innovative approach to understanding and mitigating LER in highly urbanized areas,and are also important for building ecological security patterns and promoting sustainable development.
为改进景观生态风险(LER)指数,本研究以中国城市化高度发达的珠三角城市群(PRDUA)为研究对象,引入人地关系地域系统脆弱性评价方法,分析了珠三角城市群在2002年、2007年、2012年、2017年和2022年期间的人地关系地域系统脆弱性、景观干扰度以及改进后的景观生态风险的时空变化。并选取生态用地的面积、比例、Cohesion(景观连接度指数)、AI(景观聚合指数)四个修复指标,利用地理探测器的单因子探测和交互因子探测结果衡量生态用地对景观生态风险演变的贡献程度。研究结果表明:(1)2002-2022年间,PRDUA人地关系地域系统脆弱性呈下降趋势,且空间差异显著。低脆弱性区域主要位于PRDUA边缘,而高脆弱性区域则集中在PRDUA中心。(2)LER变化与脆弱度变化呈现较高的一致性。2002–2022年间,PRDUA高风险区域呈缩小趋势,主要位于广州市、佛山市、东莞市以及深圳市。低风险区主要位于PRDUA边缘。(3)利用地理探测器衡量生态用地修复对LER变化的贡献,发现生态用地修复单因子对LER变化贡献率较低,双因子交互后贡献显著增强,尤以景观指数的Cohesion与AI交互贡献度最强。2012–2022时期,Cohesion变化与AI变化的交互作用解释力q值达到了62.213%,对LER变化的解释力最强。这些研究结果为理解和管理高度城市化地区的景观生态风险提供了新的视角和方法,对构建生态安全格局和可持续发展具有重要意义。
作者
LIU Yuzhi
CAO Wenping
WANG Fuyuan
YU Ling
刘玉芝;曹文萍;王甫园;余玲(中国科学院地理科学与资源研究所陆地表层格局与模拟重点实验室,北京100101;中国科学院大学,北京100049;湖南商务职业技术学院旅游管理学院,长沙410205;中国科学院区域可持续发展分析与模拟重点实验室,北京100101;北京大学深圳研究生院城市规划与设计学院,广东深圳518055;中国自然资源部地表系统与人地关系重点实验室,广东深圳518055)
基金
The Key Laboratory of Earth Surface System and Human-Earth Relations
Ministry of Natural Resources of China(LBXT2023YB06)
The National Natural Science Foundation of China(42371253)
The Scientific Research Project of the Hunan Provincial Department of Education(23C0764)。
