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- Title
Spatiotemporal Evolution of Ecological Quality in Typical Karst Ecologically Fragile Areas Based on Remote Sensing Ecological Indexes.
- Authors
Denghong HUANG; Zhiying ZHANG; Zhenzhen ZHANG
- Abstract
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/OU 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 lo 2020. The results show that; (D the variance contribution rates of the first principal component for the four periods were 66. 31 %, 71. 59%, 63. 18%, and 75. 24%, indicating that PCl integrated most of the characteristics of the four indices, making the RSEI suitable for evaluating ecological quality in karst mountain areas; the 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; the 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.
- Subjects
KARST; SPATIO-temporal variation; LANDSAT satellites; ENVIRONMENTAL quality; DESERTIFICATION
- Publication
Meteorological & Environmental Research, 2024, Vol 15, Issue 2, p22
- ISSN
2152-3940
- Publication type
Article
- DOI
10.19547/j.issn2152-3940.2024.02.005