| Citation: |
LIU Yong, ZHANG Xin, WEI Liangshuai, HUANG Anbang, PENG Bo, SHU Qinfeng. 2025. Analysis of Climate Change and Vegetation Change in the Yangtze River Source. Northwestern Geology, 58(1): 257-269. doi: 10.12401/j.nwg.2023127
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Analysis of Climate Change and Vegetation Change in the Yangtze River Source
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Abstract
The source of the Yangtze River is located in the remote and high-altitude Qinghai-Tibet Plateau, where the ecosystem is fragile. Influenced by global climate change and human activities, various elements closely related to the ecological system of the source area, such as glaciers, permafrost, swamps, wetlands, and vegetation, have experienced different degrees of degradation, which has aroused widespread concern from various sectors of society. This article analyzes the spatiotemporal evolution characteristics of the climate and ecological vegetation in the Yangtze River source region using long-term, high spatiotemporal resolution meteorological and MODIS NDVI data, combined with mathematical and statistical methods, and explores the response mechanism of vegetation to climate and soil water. The results show that over the past 40 years, the rainfall and surface temperature in the Yangtze River source region have decreased from southeast to northwest, and the temperature in each region has generally increased. Vegetation growth in the eastern region is better than that in the western region, and since 2000, the overall vegetation growth in the Yangtze River source region has gradually improved. Due to the sensitivity of permafrost to temperature, vegetation growth during the growing season in the Yangtze River source region is more affected by temperature than rainfall. The ecological vegetation in the Yangtze River source region is greatly influenced by soil water content, and the degree of influence gradually weakens from the surface to the deep layers.
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Keywords:
- Yangtze River source /
- climate /
- vegetation /
- trend analysis /
- response mechanisms
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References
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LIU Yong, ZHANG Xin, WEI Liangshuai, HUANG Anbang, PENG Bo, SHU Qinfeng. 2025. Analysis of Climate Change and Vegetation Change in the Yangtze River Source. Northwestern Geology, 58(1): 257-269. doi: 10.12401/j.nwg.2023127
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Figure 1.
Map of the topography of the Yangtze River source area
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Figure 2.
Distribution of rainfall dynamics curves
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Figure 3.
Distribution of temperature dynamics curves in the Yangtze River source
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Figure 4.
Spatial distribution of average annual rainfall in the Yangtze River source
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Figure 5.
Spatial distribution of annual mean temperatures in the Yangtze River source
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Figure 6.
Spatial distribution of annual mean rainfall increments in the Yangtze River source
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Figure 7.
Spatial distribution of annual mean temperature increments in the Yangtze River source
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Figure 8.
Statistical analysis of M-K mutations of rainfall
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Figure 9.
Statistical analysis of M-K mutations of temperature
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Figure 10.
Spatial distribution of NDVI vegetation index in the source area of the Yangtze River from 2000 to 2021
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Figure 11.
Spatial distribution of NDVI vegetation index changes in the Yangtze River source area from 2000 to 2021
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Figure 12.
Map of meteorological monitoring stations
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Figure 13.
Time-series variation of NDVI mean values in the Yangtze River source area during the growing season (July-September)
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Figure 14.
Correlation analysis of rainfall and temperature on NDVI value of vegetation index
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Figure 15.
Heat map of correlation between vegetation index and soil moisture content