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Chinese Journal of Applied Ecology ›› 2021, Vol. 32 ›› Issue (4): 1361-1372.doi: 10.13287/j.1001-9332.202104.014

• Original Articles • Previous Articles     Next Articles

Spatiotemporal variation and driving factors of growing season NDVI in the Tibetan Pla-teau, China.

YANG Da1, YI Gui-hua2,3*, ZHANG Ting-bin1,4, LI Jing-ji4,5, QIN Yan-bin1, WEN Bo1, LIU Zhi-yu1   

  1. 1College of Earth Science, Chengdu University of Technology, Chengdu 610059, China;
    2College of Tourism and Urban-Rural Planning, Chengdu University of Technology, Chengdu 610059, China;
    3University of Montana, Montana 59701, USA;
    4State Environmental Protection Key Laboratory of Synergetic Control and Joint Remediation for Soil & Water Pollution/ Chengdu University of Technology, Chengdu 610059, China;
    5College of Ecological Environment, Chengdu University of Technology, Chengdu 610059, China
  • Received:2020-11-23 Accepted:2021-01-26 Published:2021-10-25
  • Contact: *E-mail: yigh@cdut.edu.cn
  • Supported by:
    National Natural Science Foundation of China (41801099) and the Second Tibetan Plateau Scientific Expedition and Research Program (2019QZKK0307).

Abstract: It is important to understand the response of vegetation to climate change in Tibetan Pla-teau (TP), an ecological barrier for China and Asia. The spatiotemporal variation of the normalized difference vegetation index (NDVI) of vegetation growing season were analyzed based on the gro-wing season NDVI retrieved from MOD09A1. The relationship between NDVI and climate factors was analyzed by combining the data of meteorological stations in TP from 2001 to 2018. The results showed that NDVI in the growing season showed a slow upward trend during the study period. There was substantial interannual variation of NDVI in different climate regions. The fluctuation magnitude of NDVI value was plateau humid climate region>semi-humid climate region>semi-arid climate region>arid climate region. The proportion of area with increasing and decreasing NDVI in humid climate region, semi-humid climate region, arid climate region, semi-arid climate region on TP were 1.4% and 1.9%, 4.9% and 1.5%, 16.4% and 0.8%, 7.0% and 2.0%, respectively. The areas of increasing NDVI in arid and semi-arid climate region was significantly larger than humid and semi-humid region. Temperature was the leading factor affecting the change of NDVI in humid and semi-humid region. The impact of precipitation on NDVI was significantly stronger than that of other climate factors in arid region. The impact of air temperature in growing season on NDVI was stronger than that of precipitation and relative humidity.

Key words: Tibetan Plateau, normalized difference vegetation index (NDVI), vegetation change, climate change, path analysis, driving force