Prof. Junhuan Peng Profile

Prof. Junhuan Peng

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Proceedings Article | 23 February 2023 Paper

Alpine vegetation coverage mutation and its attribution analysis based on AVHRR NDVI data

Jianyun Zhao, Chuanli Jiang, Yuanyuan Ding, Junhuan Peng

Proceedings Volume 12551, 125512X (2023) https://doi.org/10.1117/12.2668151

KEYWORDS: Vegetation, Meteorology, Climatology, Correlation coefficients, Climate change

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In order to clarify the mutation characteristics of alpine vegetation cover, a study of vegetation coverage change and its climate response relationship was carried out in Qinghai province based on AVHRR NDVI_3g, temperature, precipitation, wind speed and sunshine data from 1982-2015. The results show that the overall NDVI series in the study area had mutant in 1998 and 2005, with mutants near 1987 in wet and semi-humid areas, and then the increase rate slowed down, and a clear trend of NDVI increase in arid areas after 2007. Temperature changes had a significant effect on vegetation coverage before the change in 1998, and there was a significant time lag effect between vegetation coverage and each meteorological factor during 1982-2015, and the changes of each meteorological factor over 1-5 years had some effect on vegetation. Cumulative changes in temperature, mutants in sunshine hours and rainfall in the study area were the main causes of mutation of vegetation coverage in 1998 and 2005.

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