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Deciphering impacts of climate extremes on Tibetan grasslands in the last fifteen years
Liu, D (Liu, Dan)1; Wang, T (Wang, Tao)1,2; Yang, T (Yang, Tao)1; Yan, ZJ (Yan, Zhengjie)3; Liu, YW (Liu, Yongwen)1; Zhao, YT (Zhao, Yutong)1; Piao, SL (Piao, Shilong)1,2,4,5
Source PublicationSCIENCE BULLETIN
2019
Volume64Issue:7Pages:446-454
DOI10.1016/j.scib.2019.03.012
Abstract

Climate extremes have emerged as a crucial driver of changes in terrestrial ecosystems. The Tibetan Plateau, facing a rapid climate change, tends to favor climate extremes. But we lack a clear understanding of the impacts of such extremes on alpine grasslands. Here we show that extreme events (drought, extreme wet, extreme cold and extreme hot) occurred at a frequency of 0.67-4 months decade (1) during 2001-2015, with extreme precipitation predominantly occurring in June-to-August and extreme temperatures in May. Drought and extreme wet cause opposite and asymmetric effects on grassland growth, with drought-induced reductions greater than increases due to extreme wet. Grassland responses to extreme temperatures, which predominantly occur in May, show a dipole-like spatial pattern, with extreme hot (cold) events enhanced (reduced) growth in the eastern plateau but slightly reduced (enhanced) growth in the western plateau. These opposite responses to extreme temperatures over the eastern plateau are explained by the possibility that the occurrence of extreme cold slows the preseason temperature accumulation, delaying the triggering of spring phenology, while extreme hot hastens the accumulation. In the western plateau, in contrast, positive responses to extreme cold are induced by accompanying high precipitation. Furthermore, high extremeness of climate events generally led to a much lower extremeness in growth response, implying that the Tibetan grasslands have a relatively high resistance to climate extremes. The ecosystem models tested could not accurately simulate grassland responses to drought and extreme temperatures, and require re-parameterization before trust can be placed in their output for this region. (C) 2019 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.

Subject AreaScience & Technology
WOS IDWOS:000472941500008
Language英语
Indexed BySCI
KeywordHigh-temperature Plant-growth Plateau Responses Photosynthesis Precipitation Cycle Performance Activation Phenology
WOS Research AreaScience & Technology - Other Topics
WOS SubjectMultidisciplinary Sciences
Cooperation Status国内
ISSN2095-9273
Department高寒生态与人类适应
URL查看原文
PublisherELSEVIER SCIENCE BV
SubtypeArticle
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Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/9335
Collection图书馆
Corresponding AuthorWang, T (Wang, Tao)
Affiliation1.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Alpine Ecol, Beijing 100101, Peoples R China;
2.Chinese Acad Sci, Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China;
3.Lanzhou Univ, Sch Life Sci, Lanzhou 730000, Gansu, Peoples R China;
4.Peking Univ, Coll Urban & Environm Sci, Beijing 100871, Peoples R China;
5.Peking Univ, Sino French Inst Earth Syst Sci, Beijing 100871, Peoples R China.
Recommended Citation
GB/T 7714
Liu, D ,Wang, T ,Yang, T ,et al. Deciphering impacts of climate extremes on Tibetan grasslands in the last fifteen years[J]. SCIENCE BULLETIN,2019,64(7):446-454.
APA Liu, D .,Wang, T .,Yang, T .,Yan, ZJ .,Liu, YW .,...&Piao, SL .(2019).Deciphering impacts of climate extremes on Tibetan grasslands in the last fifteen years.SCIENCE BULLETIN,64(7),446-454.
MLA Liu, D ,et al."Deciphering impacts of climate extremes on Tibetan grasslands in the last fifteen years".SCIENCE BULLETIN 64.7(2019):446-454.
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