globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.14037
Scopus记录号: 2-s2.0-85041181230
论文题名:
Trees tolerate an extreme heatwave via sustained transpirational cooling and increased leaf thermal tolerance
作者: Drake J.E.; Tjoelker M.G.; Vårhammar A.; Medlyn B.; Reich P.B.; Leigh A.; Pfautsch S.; Blackman C.J.; López R.; Aspinwall M.J.; Crous K.Y.; Duursma R.A.; Kumarathunge D.; De Kauwe M.G.; Jiang M.; Nicotra A.B.; Tissue D.T.; Choat B.; Atkin O.K.; Barton C.V.M.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2018
卷: 24, 期:6
起始页码: 2390
结束页码: 2402
语种: 英语
英文关键词: climate change ; Eucalyptus parramattensis ; heatwave ; latent cooling ; photosynthesis ; temperature ; thermal tolerance ; warming
Scopus关键词: angiosperm ; canopy exchange ; climate change ; climate effect ; cooling ; global perspective ; heat wave ; photosynthesis ; temperature effect ; temperature tolerance ; transpiration ; warming ; Eucalyptus parramattensis
英文摘要: Heatwaves are likely to increase in frequency and intensity with climate change, which may impair tree function and forest C uptake. However, we have little information regarding the impact of extreme heatwaves on the physiological performance of large trees in the field. Here, we grew Eucalyptus parramattensis trees for 1 year with experimental warming (+3°C) in a field setting, until they were greater than 6 m tall. We withheld irrigation for 1 month to dry the surface soils and then implemented an extreme heatwave treatment of 4 consecutive days with air temperatures exceeding 43°C, while monitoring whole-canopy exchange of CO2 and H2O, leaf temperatures, leaf thermal tolerance, and leaf and branch hydraulic status. The heatwave reduced midday canopy photosynthesis to near zero but transpiration persisted, maintaining canopy cooling. A standard photosynthetic model was unable to capture the observed decoupling between photosynthesis and transpiration at high temperatures, suggesting that climate models may underestimate a moderating feedback of vegetation on heatwave intensity. The heatwave also triggered a rapid increase in leaf thermal tolerance, such that leaf temperatures observed during the heatwave were maintained within the thermal limits of leaf function. All responses were equivalent for trees with a prior history of ambient and warmed (+3°C) temperatures, indicating that climate warming conferred no added tolerance of heatwaves expected in the future. This coordinated physiological response utilizing latent cooling and adjustment of thermal thresholds has implications for tree tolerance of future climate extremes as well as model predictions of future heatwave intensity at landscape and global scales. © 2018 John Wiley & Sons Ltd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110399
Appears in Collections:影响、适应和脆弱性
气候变化事实与影响

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作者单位: Hawkesbury Institute for the Environment, Western Sydney University, Penrith, NSW, Australia; Forest and Natural Resources Management, SUNY-ESF, Syracuse, NY, United States; Department of Forest Resources, University of Minnesota, St Paul, MN, United States; School of Life Sciences, University of Technology Sydney, Broadway, NSW, Australia; PIAF, INRA, Université Clermont Auvergne, Clermont-Ferrand, France; Department of Biology, University of North Florida, Jacksonville, FL, United States; ARC Centre of Excellence for Climate Extremes, University of New South Wales, Sydney, NSW, Australia; Division of Ecology & Evolution, Research School of Biology, The Australian National University, Canberra, ACT, Australia; ARC Centre of Excellence in Plant Energy Biology, Research School of Biology, The Australian National University, Canberra, ACT, Australia

Recommended Citation:
Drake J.E.,Tjoelker M.G.,Vårhammar A.,et al. Trees tolerate an extreme heatwave via sustained transpirational cooling and increased leaf thermal tolerance[J]. Global Change Biology,2018-01-01,24(6)
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