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[1]LI Yan,DAI Rui,ZHANG Yunxia,et al.Spatiotemporal Variation of Vegetation NDVI and Its Relationship with Altitude Gradient in Southwest Tibet Plateau[J].Research of Soil and Water Conservation,2022,29(04):215-222.

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Spatiotemporal Variation of Vegetation NDVI and Its Relationship with Altitude Gradient in Southwest Tibet Plateau

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 29 Number of periods: 2022 04 Page number: 215-222 Column: Public date: 2022-06-20

Title:: Spatiotemporal Variation of Vegetation NDVI and Its Relationship with Altitude Gradient in Southwest Tibet Plateau

Author(s):: LI Yan¹, DAI Rui², ZHANG Yunxia¹, GONG Jie¹; (1.College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China; 2.Climate Center of Tibet Meteorogical Bureau, Lhasa 850000, China)

Keywords:: Qinghai-Tibet Plateau; normalized difference vegetation index; spatiotemporal differentiation; elevation gradient; MODIS NDVI

CLC:: P95

DOI:: -

Abstract:: Vegetation distribution in the Qinghai-Tibet Plateau is not only closely influenced by regional hydrothermal conditions, but also affected by the altitude and topography of the plateau. Understanding of the relationship between vegetation and altitude gradient is of great scientific and practical significance to the ecological protection of the Qinghai-Tibet Plateau. Based on MODIS NDVI data and vegetation type data, we analyzed the spatial and temporal variation characteristics of NDVI during the growing season of different vegetation types in the Southwest Tibetan Plateau in the past 21 years, then explored the correlation between vegetation cover and elevation gradient based on DEM data. The results show that there are eight vegetation cover types in the Southwest Tibet Plateau. including forest, desert, grassland, meadow, alpine vegetation, cultivated vegetation, shrub, and other vegetation types; the NDVI of each vegetation type kept increasing and reached their maximum value in 2017; the increasing rates of grassland, meadow, shrub and alpine vegetation in the study area were 0.006/decade, 0.004/decade, 0.01/decade and 0.006/decade, respectively; in addition to the local vegetation degradation trend, most of the vegetation coverage continued to improve; grassland, meadow, shrub and alpine vegetation mainly concentrate in the area with an altitude of more than 4 000 m, and NDVI has great differences in each elevation gradient; the NDVI of different vegetation types showed different decreasing trends with the increase of altitude, and the NDVI of the same vegetation had similar changing trends with the change of altitude gradient in different years. These results can provide the scientific support for decision-making for ecological construction, vegetation restoration, and animal husbandry in Southwest Tibet Plateau.

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Last Update: 2022-06-20