首页|Co-influence of the start of thermal growing season and precipitation on vegetation spring green-up on the Tibetan Plateau
Co-influence of the start of thermal growing season and precipitation on vegetation spring green-up on the Tibetan Plateau
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国家科技期刊平台
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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 re-gions.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.
Tibetan PlateauStart of growing seasonTemperaturePrecipitationClimate change
Chen-Peng WANG、Meng-Tian HUANG、Pan-Mao ZHAI
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State Key Laboratory of Severe Weather and Institute of Global Change and Polar Meteorology,Chinese Academy of Meteorological Sciences,Beijing 100081,China
University of Chinese Academy of Sciences,Beijing 100049,China
国家科技期刊平台
NSTL
万方数据
