摘要
全球城市化进程的不可逆及快速发展严重影响了城市植被的生长,城市植被生长状况代表了区域生态环境的稳定性,区分城市化对植被的直接影响和间接影响并进行定量的区域分析对深入理解城市化对植被生长的影响机制和推动区域绿色可持续发展有着重要意义。以广东省为研究对象,基于MODIS13A1产品中增强型植被指数和不透水路面数据,运用slope趋势分析和相关性分析等方法,量化研究2000—2018年广东省这一区域尺度下城市化对植被生长的直接和间接影响。研究结果表明:(1)2000—2018年广东省植被生长状态较为稳定且随着时间的变化有所增强。(2)广东省植被指数与城市化强度存在显著负相关关系;在城市化过程中,除了负面的直接影响,还存在消极和积极的间接影响。(3)间接影响的占比随着城市化强度的增加,呈现出下降⁃上升⁃下降的趋势。积极的间接影响的占比最大值出现时,城市化强度约达0.9。可为广东省城市生态系统的可持续发展提供重要的数据积累和科学依据。
Urbanization drives global changes in land cover,biogeochemical cycles,climate,and ecosystems,with changes in urban environments considered as"detectors"of future global changes.Urban vegetation serves as a reliable indicator of the urban ecological environment.However,the irreversible and rapid development of global urbanization has significantly impacted urban vegetation growth.The growth status of urban vegetation reflects the stability of regional ecological environments.Distinguishing between the direct and indirect impacts of urbanization on vegetation and conducting quantitative regional analysis are crucial for a deeper understanding of the mechanisms by which urbanization affects vegetation growth and for promoting regional green sustainable development.To better understand the relationship between regional urbanization and vegetation growth,this study focuses on Guangdong Province.Using data from the MODIS13A1 product,including Enhanced Vegetation Index(EVI)and impervious surface data,and employing methods such as slope trend analysis and correlation analysis,the study quantifies the direct and indirect impacts of urbanization on vegetation growth in Guangdong Province from 2000 to 2018.The research findings are as follows:(1)Overall,vegetation growth in Guangdong Province remained relatively stable and showed enhancement over time from 2000 to 2018.Regions with decreased EVI were mainly concentrated in areas with urban impervious surfaces,indicating a negative impact of urbanization⁃induced pavement hardening on vegetation growth.(2)There was a significant negative correlation between vegetation index and urbanization intensity in Guangdong Province,with a well⁃fitted cubic regression curve.Besides negative direct impacts,both negative and positive indirect impacts exist during urbanization.Notably,the positive indirect impacts of urbanization on vegetation growth are strengthened as urban development compensates for negative direct impacts.(3)The proportion of indirect impacts showed a trend of decrease⁃rise⁃decrease with the increase of urbanization intensity,with turning points atβ≈0.2 andβ≈0.9.When urbanization intensity reached approximately 0.7,indirect impacts shifted from negative to positive,and the proportion of positive indirect impacts reached its maximum when urbanization intensity was about 0.9.This study contributes to a deep understanding of the growth of urban vegetation in Guangdong Province and the impact of urban environments on vegetation growth.It provides important data accumulation and scientific basis for the sustainable development of urban ecosystems in Guangdong Province.The aim is to maximize the positive indirect impacts of urbanization on vegetation growth,promote long⁃term vegetation growth,alleviate environmental pressure caused by increasing impervious surfaces during urbanization,achieve coordinated land use and vegetation coverage in urban areas,and ultimately realize the green sustainable development of regional cities.
作者
周颖禧
关艳炜
曹峥
吴志峰
俞方圆
ZHOU Yingxi;GUAN Yanwei;CAO Zheng;WU Zhifeng;YU Fangyuan(School of Geographic Science and Remote Sensing,Guangzhou University,Guangzhou 510000,China)
出处
《生态学报》
CAS
CSCD
北大核心
2024年第16期7063-7073,共11页
Acta Ecologica Sinica
基金
国家自然科学基金(41901060)。
