Spatiotemporal Evolution of Ecological Quality in Typical Karst Ecologically Fragile Areas Based on Remote Sensing Ecological Indexes  

作　　者：Denghong HUANG Zhiying ZHANG Zhenzhen ZHANG 

机构地区：[1]School of Karst Science/School of Geography&Environmental Science,Guizhou Normal University,Guiyang 550025,China [2]State Engineering Technology Institute for Karst Desertification Control,Guiyang 550025,China

出　　处：《Meteorological and Environmental Research》2024年第2期22-28,共7页气象与环境研究（英文版）

基　　金：Supported by Guizhou Provincial Key Technology R&D Program ([2023]General 211);Guizhou Science and Technology Innovation Base Construction Project (Qian Ke He Zhong Yin Di[2023]005).

摘　　要：Fast and effective remote sensing monitoring is an important means for analyzing the spatio-temporal changes in ecological quality in fragile karst regions.This study focuses on Guanling Autonomous County,a national-level demonstration county for comprehensive desertification control.Based on Landsat TM/OLI remote sensing image data from 2005,2010,2015,and 2020,remote sensing ecological indices were used to analyze the spatio-temporal changes in ecological quality in Guanling Autonomous County from 2005 to 2020.The results show that:①the variance contribution rates of the first principal component for the four periods were 66.31%,71.59%,63.18%,and 75.24%,indicating that PC1 integrated most of the characteristics of the four indices,making the RSEI suitable for evaluating ecological quality in karst mountain areas;②the remote sensing ecological index grades have been increasing year by year,with an overall trend of improving ecological quality.The area of higher-grade ecological quality has increased spatially,while fragmented patches have gradually decreased,becoming more concentrated in the low-altitude areas in the northwest and east,and there is a trend of expansion towards higher-altitude areas;③the ecological environment quality in most areas has improved,with the improvement in RSEI spatio-temporal variation becoming more noticeable with increasing slope.Areas of higher-grade quality appeared in 2010,and the range of higher-grade quality expanded with increasing slope.

关 键 词：Ecological quality Remote sensing ecological index Karst mountainous area Ecological fragility Guanling Autonomous County 

分 类 号：X171.1[环境科学与工程—环境科学]