Variation of the Start Date of the Vegetation Growing Season (SOS) and Its Climatic Drivers in the Tibetan Plateau

Author:

Tang Hanya1,Li Yongke2,Sun Xizao1,Zhou Xuelin3,Li Cheng45,Ma Lei45,Liu Jinlian1,Jiang Ke1,Ding Zhi1,Liu Shiwei1,Yu Pujia1ORCID,Jia Luyao1,Zhang Feng1

Affiliation:

1. Chongqing Jinfo Mountain Karst Ecosystem National Observation and Research Station, School of Geographical Sciences, Southwest University, Chongqing 400715, China

2. College of Computer and Information Engineering, Xinjiang Agriculture University, Urumqi 830052, China

3. Zhuhai Orbita Aerospace Science & Technology Co., Ltd., Zhuhai 519080, China

4. Observation and Research Station of Ecological Restoration for Chongqing Typical Mining Areas, Ministry of Natural Resources, Chongqing Institute of Geology and Mineral Resources, Chongqing 401120, China

5. Wansheng Mining Area Ecological Environment Protection and Restoration of Chongqing Observation and Research Station, Ministry of Natural Resources, Chongqing Institute of Geology and Mineral Resources, Chongqing 400715, China

Abstract

Climate change inevitably affects vegetation growth in the Tibetan Plateau (TP). Understanding the dynamics of vegetation phenology and the responses of vegetation phenology to climate change are crucial for evaluating the impacts of climate change on terrestrial ecosystems. Despite many relevant studies conducted in the past, there still remain research gaps concerning the dominant factors that induce changes in the start date of the vegetation growing season (SOS). In this study, the spatial and temporal variations of the SOS were investigated by using a long-term series of the Normalized Difference Vegetation Index (NDVI) spanning from 2001 to 2020, and the response of the SOS to climate change and the predominant climatic factors (air temperature, LST or precipitation) affecting the SOS were explored. The main findings were as follows: the annual mean SOS concentrated on 100 DOY–170 DOY (day of a year), with a delay from east to west. Although the SOS across the entire region exhibited an advancing trend at a rate of 0.261 days/year, there were notable differences in the advancement trends of SOS among different vegetation types. In contrast to the current advancing SOS, the trend of future SOS changes shows a delayed trend. For the impacts of climate change on the SOS, winter Tmax (maximum temperature) played the dominant role in the temporal shifting of spring phenology across the TP, and its effect on SOS was negative, meaning that an increase in winter Tmax led to an earlier SOS. Considering the different conditions required for the growth of various types of vegetation, the leading factor was different for the four vegetation types. This study contributes to the understanding of the mechanism of SOS variation in the TP.

Funder

National Natural Science Foundation of China

Major Science and Technology Special Project of the Science and Technology Department of Xinjiang Uygur Autonomous Region

Natural Science Foundation of Chongqing

Publisher

MDPI AG

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