文献类型： 外文期刊
作者： Liu, Yongwen 1 ; Ding, Jinzhi 1 ; Li, Peilin 2 ; Zhang, Rongrong 1 ; Zhao, Jingxue 3 ; Dorji, Tsechoe 1 ;
作者机构： 1.Chinese Acad Sci, Inst Tibetan Plateau Res, State Key Lab Tibetan Plateau Earth Syst Environm, Beijing 100101, Peoples R China
2.Xian Int Studies Univ, Inst Human Geog, Coll Tourist, Xian 710127, Peoples R China
3.Lanzhou Univ, State Key Lab Grassland Agroecosyst, Lanzhou 730000, Peoples R China
4.Lanzhou Univ, Coll Ecol, Lanzhou 730000, Peoples R China
5.Grassland Sci Inst, Tibet Acad Agr & Anim Husb Sci, State Key Lab Hulless Barley & Yak Germplasm Resou, Lhasa 850031, Peoples R China
关键词： Climate change; Photosynthesis; Elevational pattern; Plant growth seasonality; Third Pole; Alpine ecosystem
期刊名称：AGRICULTURAL AND FOREST METEOROLOGY （ 影响因子：6.2； 五年影响因子：6.9 ）
ISSN： 0168-1923
年卷期： 2023 年 339 卷
页码：
收录情况： SCI
摘要： The Tibetan Plateau has experienced elevation-dependent climate warming, which has profoundly influenced the seasonal dynamics of plant growth. However, how peak photosynthesis timing (DOYPmax), a key component of plant growth seasonality, responds to climate change on the Tibetan Plateau remains unclear. Here, we investigated the change in the elevational gradient in DOYPmax on the Tibetan Plateau during 2001-2018 and its drivers. We mapped the primary climatic constraint on plant photosynthesis and found that it was temperature at 3000-4000 m a.s.l. in the central and eastern parts but soil water at 4000-5000 m a.s.l. in the southwestern part. DOYPmax increased by 1.0 & PLUSMN; 0.1 days/100 m with increasing elevation from 3000 to 5000 m a.s.l., but the elevational gradient in DOYPmax decreased by -0.8 & PLUSMN; 0.2 days/100 m/decade during 2001-2018 due to both direct and indirect effects of climate change. Specifically, at 3000-4000 m a.s.l., DOYPmax was delayed because of the direct effect of the increase in soil water. At 4000-5000 m a.s.l., DOYPmax advanced due to the warminginduced earlier green-up date in the central plateau and the drought-induced later spring phenology in the southwestern plateau. Such a change in plant growth seasonality should alter seasonal carbon cycle of alpine ecosystems, summer diets of the migrant herbivores and alpine plant-animal interactions along elevation gradients, but further efforts are needed to clarify how herbivores that migrate long distances, e.g., Tibetan antelope, adapt to changes in the elevational gradient in peak plant growth timing.
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