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Changing Trend of NDVI and Its Influencing Factors in the Permafrost Regions of the Northern Hemisphere from 2000 to 2021(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2024年第03期
Page:
321-333
Research Field:
环境与可持续发展
Publishing date:

Info

Title:
Changing Trend of NDVI and Its Influencing Factors in the Permafrost Regions of the Northern Hemisphere from 2000 to 2021
Author(s):
LI Yu-ying1; 2; 3;  LIU Gui-min1*;  WU Xiao-dong2; 3;  WANG Yao-xin1;  KANG Guo-hui1; ZHAO Jun1;  DONG Yun-xia1;  WANG Lin1
(1. School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, Gansu, China; 2. State Key Laboratory of Cryosphere Science, Northwest Institute of Eco-environment and Resources, ChineseAcademy of Sciences, Lanzhou 730000, Gansu, China; 3.Cryosphere Research Station on the Qinghai-Tibet Plateau, Northwest Institute ofEco-environmentandResources, Chinese Academy of Sciences,Lanzhou 730000, Gansu, China)
Keywords:
NDVI;  temperature;  precipitation;  snow cover;  active layer thickness;  spatial-temporal change;  Pearson correlation analysis;  permafrost region
PACS:
P95
DOI:
10.19814/j.jese.2023.12054
Abstract:
Climate warming is leading to rapid changes in land cover types and vegetation biomass in the permafrost regions of the Northern Hemisphere. However, to what extent of the vegetation growth responding to climate change in different permafrost regions and different land cover types regions is still unknown. The spatial-temporal change of normalized difference vegetation index(NDVI)and its response to climate variables from 2000 to 2021 were analyzed based on Slope trend analysis and Pearsoncorrelation analysis. The results show that about 21.43% of the NDVI in the permafrostregionsshows a significant increasing trend, in which the increasing rates of NDVI in the continuous and discontinuous permafrost regionsare 2-3 times higher than that in the sporadic permafrostregion.On the monthly scale, about 33.75% of the NDVI in the permafrostregionsshows a significant increasing trend in June, with the fastest increasing rates in continuous permafrostregionsand scrub vegetation typeregions.Temperature, precipitation, and active layer thickness exhibit a significant increasing trend, while snow cover shows a decreasing trend. Warmer temperatures promote vegetation growth in low-latitude permafrost regions such as Russia. Precipitation promotes vegetation growth in some specific arid zones such as Mongolian Plateau, but has a negative effect in the central Russia and the southern Canada. Snowpack promotes vegetation growth in areas with low snow cover, such as the southern Russia, but has a negative effect in areas with high snow cover, such as the Arctic. In general, the vegetation within the permafrost region of the Northern Hemisphere is experiencing an overall growth trend, and that warmer temperatures are still the main controlling factor for vegetation growth in the permafrost region of the Northern Hemisphere. The increase in theactive layerthicknesscontributes to the accelerated growth of vegetation in permafrost regions such as the northern Russia. In addition, the growth of NDVI in different permafrost types exhibits noticeable monthly variations, highlighting the need to consider these differences in future developments and improvements of vegetation models.

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Last Update: 2024-05-30