Ecological Vulnerability Assessment of the Changjitu Region
DOI:
https://doi.org/10.54097/34qs6s77Keywords:
Changjitu Region, Ecological Vulnerability Assessment, GIS/RS Technology, Ecological Index (EI)Abstract
To safeguard the ecological security of the Changjitu Pilot Zone (a core cross-border cooperation area in Northeast Asia) and address ecological stress from industrialization, urbanization, and agricultural intensification, this study assessed its ecological vulnerability. Using 2009 (Strategy launch year) and 2019 as time nodes, six environmental variables (NDVI, NDWI, LC, Slope, Surface Runoff, Sub-basin) from Landsat and ASTER GDEM data were selected. An Ecological Index (EI) was built via GIS overlay analysis, with the 5km-radius average EI used to classify areas into five categories (fragile to high-quality). Results showed: areas below the ecological red line (≤0.6) dropped from 40% to 25%, high-quality areas doubled (0.04%→0.08%); fragile areas concentrated in Changchun/Jilin urban centers (>30% of urban area); Nong’an, Dehui, Dunhua, and Hunchun improved significantly; natural deterioration (2.25% of total area) near Changbai Mountains linked to 2019 humidity decline. This study clarifies the "structure-function-stress" mechanism, providing a basis for territorial space optimization and cross-border ecological security in Northeast Asia.
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