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Vegetation Dynamics and Responses to Climate Variations and Human Activities in the Basin of the Yarlung Tsangpo, Lhasa, and Nianchu Rivers in the Tibetan Plateau

Author

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  • Chunbo Su

    (College of Geography and Planning, Chengdu University of Technology, Chengdu 610059, China)

  • Jingji Li

    (College of Ecology and Environment, Chengdu University of Technology, Chengdu 610059, China
    Tianfu Yongxing Laboratory, Chengdu 610213, China)

  • Ying Xiang

    (College of Ecology and Environment, Chengdu University of Technology, Chengdu 610059, China)

  • Shurong Yang

    (College of Ecology and Environment, Chengdu University of Technology, Chengdu 610059, China)

  • Xiaochao Zhang

    (College of Ecology and Environment, Chengdu University of Technology, Chengdu 610059, China
    Tianfu Yongxing Laboratory, Chengdu 610213, China)

  • Dinghui Xu

    (Huaneng Tibet Yarlung Zangbo River Hydropower Development Investment Co., Ltd., Lhasa 850000, China)

  • Shijun Wang

    (Tianfu Yongxing Laboratory, Chengdu 610213, China
    Huaneng Tibet Yarlung Zangbo River Hydropower Development Investment Co., Ltd., Lhasa 850000, China)

  • Tingbin Zhang

    (College of Earth and Planetary Sciences, Chengdu University of Technology, Chengdu 610059, China)

  • Peihao Peng

    (College of Geography and Planning, Chengdu University of Technology, Chengdu 610059, China)

  • Xiaolu Tang

    (College of Ecology and Environment, Chengdu University of Technology, Chengdu 610059, China
    Tianfu Yongxing Laboratory, Chengdu 610213, China)

Abstract

Terrestrial ecosystem vegetation are vulnerable to the joint impacts of human activities and climate change, particularly in ecologically fragile areas such as the Tibetan Plateau. Identifying vegetation cover changes and distinguishing their driving factors are crucial for ecological conservation in this region. This study utilized MODIS normalized difference vegetation index (NDVI) data from 2000 to 2019, combined with trend analysis (univariate linear regression and the Mann–Kendall test), partial correlation analysis, and residual analysis methods, to investigate the spatial and temporal dynamics of vegetation cover and its responses to climate change and human activities in the Yarlung Tsangpo River, Lhasa River, and Nianchu River Basin (YLN Basin) on the Tibetan Plateau. The results revealed significant differences in vegetation dynamics both in summer and the growing season: the average summer NDVI showed a significant decreasing trend during the study period, whereas the growing season NDVI exhibited no significant overall temporal trend, which highlighted the necessity of assessing vegetation dynamics seasonally to accurately capture their interannual complexity. Partial correlation analysis indicated that precipitation was the key limiting climatic factor for vegetation growth in this region, with its positive influence covering over 90% of the land area during summer and over 60% during the growing season. The residual analysis further indicated the dual and spatially heterogeneous roles of human activities: on the one hand, positive impacts, primarily from vegetation restoration projects, promoted NDVI increases in some areas; on the other hand, negative impacts, such as continuous grazing pressure, population growth, and associated land use changes, inhibited vegetation development in other areas. This study quantitatively assessed the combined effects of climate variability and complex human activities on the vegetation NDVI in the YLN Basin, emphasizing that the development of adaptive management and effective vegetation restoration strategies must fully consider seasonal differences, the key climatic limiting factor (water availability), and the spatial heterogeneity of human impacts to promote sustainable development in this ecologically fragile region.

Suggested Citation

  • Chunbo Su & Jingji Li & Ying Xiang & Shurong Yang & Xiaochao Zhang & Dinghui Xu & Shijun Wang & Tingbin Zhang & Peihao Peng & Xiaolu Tang, 2025. "Vegetation Dynamics and Responses to Climate Variations and Human Activities in the Basin of the Yarlung Tsangpo, Lhasa, and Nianchu Rivers in the Tibetan Plateau," Land, MDPI, vol. 14(5), pages 1-21, May.
    • Handle: RePEc:gam:jlands:v:14:y:2025:i:5:p:1027-:d:1651428
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    References listed on IDEAS

    as
    1. Yan Li & Jie Gong & Yunxia Zhang & Bingli Gao, 2022. "NDVI-Based Greening of Alpine Steppe and Its Relationships with Climatic Change and Grazing Intensity in the Southwestern Tibetan Plateau," Land, MDPI, vol. 11(7), pages 1-16, June.
    2. Camille Parmesan & Gary Yohe, 2003. "A globally coherent fingerprint of climate change impacts across natural systems," Nature, Nature, vol. 421(6918), pages 37-42, January.
    3. Mingkui Cao & F. Ian Woodward, 1998. "Dynamic responses of terrestrial ecosystem carbon cycling to global climate change," Nature, Nature, vol. 393(6682), pages 249-252, May.
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