Co-influence of the start of thermal growing season and precipitation on vegetation spring green-up on the Tibetan Plateau  

作　　者：Chen-Peng WANG Meng-Tian HUANG Pan-Mao ZHAI 

机构地区：[1]State Key Laboratory of Severe Weather and Institute of Global Change and Polar Meteorology,Chinese Academy of Meteorological Sciences,Beijing 100081,China [2]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Advances in Climate Change Research》2024年第2期327-337,共11页气候变化研究进展（英文版）

基　　金：This study was supported by the Second Tibetan Plateau Scientific Expedition and Research Program(2019QZKK1001);the National Natural Science Foundation of China(42105160);the Basic Research Fund of the Chinese Academy of Meteorological Sciences(2023Z025).

摘　　要：The climate in the Tibetan Plateau(TP)has undergone significant change in recent decades,mainly in thermal and water conditions,which plays a crucial role in phenological changes in vegetation spring phenology.However,how the start of the thermal growing season(SOS-T)and the start of the rainy season(SORS)as key climatic factors affect vegetation green-up remains unclear.Given that these factors characterize thermal and water conditions required for vegetation green-up,this study investigated changes in the SOS-T and SORS from 1961 to 2022,using observation-based datasets with long time series.We found that the SOS-T and SORS have advanced across the TP in 1961-2022 and have shown a spatial pattern of advancement in the east and delay in the west in 2000-2022.Further,the co-effect of temperature and precipitation change on the start of vegetation growing season(SOS-V)in 2000-2022 was observed.Averaged across TP,the SOS-V had an early onset of 1.3 d per decade during 2000-2022,corresponding to advanced SOS-T and SORS.Regionally,the SOS-V generally occurred nearly at the same time as the SOS-T in the high-altitude meadow region.A substantial delay in the SOS-V relative to the SOS-T was observed in the desert,shrub,grassland and forest regions and generally kept pace with the SORS.Furthermore,for 50%of the vegetated regions on the TP,inter-annual variation in the delay in the SOS-V relative to the SOS-T was dominated by precipitation change,which was profound in warm-climate regions.This study highlights the co-regulation of precipitation and temperature change in the SOS-V in different vegetation cover regions in the TP,offering a scientific foundation for comprehending the impact of climate change and prospects for vegetation phenology on the TP.

关 键 词：Tibetan Plateau Start of growing season Temperature PRECIPITATION Climate change 

分 类 号：Q94[生物学—植物学]