Variability of NDVI with Elevation and Precipitation in Yarlung Zangbo River Basin

LIU Xiaowan; PENG Dingzhi; XU Zongxue

doi:10.7522/j.issn.1000-0534.2017.00048

Plateau Meteorology >

2018 , Vol. 37 >Issue 2: 349 - 357

DOI: https://doi.org/10.7522/j.issn.1000-0534.2017.00048

Variability of NDVI with Elevation and Precipitation in Yarlung Zangbo River Basin

LIU Xiaowan ,
PENG Dingzhi ,
XU Zongxue

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College of Water Sciences, Beijing Normal University, Beijing 100875, China;Beijing Key Laboratory of Urban Hydrological Cycle and Sponge City Technology, Beijing 100875, China

Received date: 2017-02-27

Online published: 2018-04-28

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Abstract

Spatial discrepancy of vegetation is mainly derived from terrain abnormality and uneven distribution of precipitation. Yarlung Zangbo River basin, situated in the Tibetan autonomous region with great altitude difference, was selected as the case study. With use of moving t mutation test, tendency value computation, Pearson correlation analysis method, spatial and temporal pattern of NDVI and its relationship with elevation and precipitation in the Yarlung Zangbo River basin were investigated by combining the datasets of NDVI, precipitation and elevation within 0.25°×0.25° pixels. The results show that:(1) distribution of NDVI heavily depends on elevation and the relationship between NDVI and elevation is apparently negative with tendency value of -0.000 18 m^-1. NDVI of pixels less than 3 003 m and over 5 843 m exhibited in linearly reduction with the elevation increase, while the magnitudes of NDVI in pixels with elevation between 3 003 m and 5 843 m greatly differ with the fitted NDVI using elevation; (2) According to three elevation bands divided by 3 767 m and 5 051 m, the magnitude extent of NDVI are 0.65~0.88, 0.17~0.49 and 0.09~0.24, respectively; (3) Vegetation growth within 12 months can be grossly divided into three phases including February to May, June to September and October to next January; (4) An increasing tendency was detected in NDVI over 5 051 m, and there was a decreasing tendency in NDVI from June to September at pixels located between 3 767 m and 5 051 m, however at less than 3 767 m, NDVI are generally of downward trend; (5) Variability of 32% NDVI are controlled by elevation, but that 51% NDVI are dominated by precipitation with the correlation coefficient over 0.7 mainly distributes between 3 003 m and 5 843 m (especially for the pixels with elevation over 4 010 m in them), and that the leftover 17% NDVI primarily depend on other factors. The findings are expected to provide an insight for local ecological protection and water resources management and be a reference for relevant studies in similar areas.

Key words： NDVI; elevation; precipitation; Yarlung Zangbo River

Cite this article

LIU Xiaowan , PENG Dingzhi , XU Zongxue . Variability of NDVI with Elevation and Precipitation in Yarlung Zangbo River Basin[J]. Plateau Meteorology, 2018 , 37(2) : 349 -357 . DOI: 10.7522/j.issn.1000-0534.2017.00048

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