摘要
喀斯特景观破碎化程度高、抗干扰能力差,厘清喀斯特区景观格局时空动态变化对喀斯特生态环境保护具有重要意义。本文以漓江流域为研究区,基于GEE平台获取的2000–2020年5期Landsat系列影像作为数据源,从景观利用程度、景观类型动态度以及景观格局指数层面分析研究流域景观空间分布及动态演化。结果表明:(1)漓江流域喀斯特地区和非喀斯特地区景观结构、景观类型变化趋势均存在较大差异。(2)漓江流域综合景观类型动态度为0.22%,景观利用综合指数范围在239.49–244.88,喀斯特地区景观利用程度比非喀斯特地区更高,景观变化速率更加激烈。喀斯特地区景观利用综合指数为262.32–270.50,非喀斯特地区景观利用综合指数为225.28–227.01,且喀斯特地区的综合景观类型动态度为0.31%,是非喀斯特地区的2倍左右。(3)漓江流域景观演化整体表现为破碎度增加、连通性减弱、优势度下降、异质化增强的趋势,其中喀斯特地区尤为突出。研究结果可为桂林市国家可持续发展创新示范区建设目标的实现提供科学依据,为喀斯特流域生态环境治理提供技术参考。
Given the high degree of fragmentation and poor resistance to disturbance in karst landscapes,it is important to clarify the spatial and temporal dynamics of landscape patterns in karst areas when designing karst ecological protection strategies.Using the Li River Basin as the study area,the spatial distribution and dynamic evolution of landscape patterns in the basin were analyzed at the levels of landscape utilization,landscape type dynamics and landscape pattern indices based on the Landsat series images for 2000 to 2020 obtained from the GEE platform as the data source.The results show three important aspects of this typical karst watershed.(1)There are large differences in landscape structure and landscape type trends between the karst and non-karst areas in the Li River Basin.(2)The comprehensive landscape type dynamic attitude of the Li River Basin is 0.22%,and the composite index of landscape type use varies from 239.49 to 244.88.The degree of landscape use is higher in karst areas than in non-karst areas,and the rate of landscape change in karst areas is more intense.The integrated index of landscape use in karst areas ranges from 262.32 to 270.50,and in non-karst areas it spans 225.28 to 227.01.The integrated landscape type motility in the karst areas is 0.31%,which is about twice as high as that in non-karst areas.(3)The overall landscape evolution of the Li River Basin shows trends of increasing fragmentation,decreasing connectivity,decreasing dominance and increasing heterogeneity,and these trends are particularly prominent in the karst areas.The results of this study can provide a scientific basis for realizing the construction goals of the National Sustainable Development Innovation Demonstration Zone in Guilin,and a technical reference for the ecological environmental management of the karst watershed.
作者
魏青青
何文
王金叶
周馨冉
姚月锋
WEI Qingqing;HE Wen;WANG Jinye;ZHOU Xinran;YAO Yuefeng(School of Tourism and Landscape Architecture,Guilin University of Technology,Guilin,Guangxi 541006,China;Guangxi Key Laboratory of Plant Conservation and Restoration Ecology in Karst Terrain,Guangxi Institute of Botany,Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences,Guilin,Guangxi 541006,China;Nanning Institute of Technology,Nanning 530000,China)
基金
The Guangxi Key Research and Development Program(AB22035060)
The National Natural Science Foundation of China(32060369)
The Guangxi Academy of Sciences Basic Scientific Research Operation Fund Project(CQZ-D-1904)。
