Carbon dynamics of eucalypt seedlings exposed to progressive drought in elevated [CO2] and elevated temperature
Honglang Duan,Jeffrey S. Amthor,Remko A. Duursma,Anthony P. O'Grady,Brendan Choat,David T. Tissue +5 more
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TLDR
The combined effects of elevated [CO2] and elevated temperature on moderate drought stressed seedlings were reduced with progressive drought, with no sustained effects on growth despite greater whole-plant TNC content.Abstract:
Elevated [CO2] and temperature may alter the drought responses of tree seedling growth, photosynthesis, respiration and total non-structural carbohydrate (TNC) status depending on drought intensity and duration. Few studies have addressed these important climatic interactions or their consequences. We grew Eucalyptus globulus Labill. seedlings in two [CO2] concentrations (400 and 640 μl l(-1)) and two temperatures (28/17 and 32/21 °C) (day/night) in a sun-lit glasshouse, and grew them in well-watered conditions or exposed them to two drought treatments having undergone different previous water conditions (i.e., rewatered drought and sustained drought). Progressive drought in both drought treatments led to similar limitations in growth, photosynthesis and respiration, but reductions in TNC concentration were not observed. Elevated [CO2] ameliorated the impact of the drought during the moderate drought phase (i.e., Day 63 to Day 79) by increasing photosynthesis and enhancing leaf and whole-plant TNC content. In contrast, elevated temperature exacerbated the impact of the drought during the moderate drought phase by reducing photosynthesis, increasing leaf respiration and decreasing whole-plant TNC content. Extreme drought (i.e., Day 79 to Day 103) eliminated [CO2] and temperature effects on plant growth, photosynthesis and respiration. The combined effects of elevated [CO2] and elevated temperature on moderate drought stressed seedlings were reduced with progressive drought, with no sustained effects on growth despite greater whole-plant TNC content.read more
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Plant carbon metabolism and climate change: elevated CO2 and temperature impacts on photosynthesis, photorespiration and respiration.
TL;DR: This work reviews how photosynthesis, photorespiration and respiration are affected by increasing atmospheric CO2 concentrations and climate warming, both separately and in combination and highlights the need to study these physiological processes together to better predict how vegetation carbon metabolism will respond to climate change.
Journal ArticleDOI
Research frontiers for improving our understanding of drought-induced tree and forest mortality.
Henrik Hartmann,Catarina F. Moura,Catarina F. Moura,Catarina F. Moura,William R. L. Anderegg,Nadine K. Ruehr,Yann Salmon,Yann Salmon,Craig D. Allen,Stefan K. Arndt,David D. Breshears,Hendrik Davi,David W. Galbraith,Katinka X. Ruthrof,Katinka X. Ruthrof,Jan Wunder,Jan Wunder,Henry D. Adams,Jasper Bloemen,Jasper Bloemen,Maxime Cailleret,Richard Cobb,Arthur Gessler,Thorsten E. E. Grams,Steven Jansen,Markus Kautz,Francisco Lloret,Michael O'Brien +27 more
TL;DR: A global tree mortality map is updated and a roadmap to a more holistic understanding of forest mortality across scales is presented to achieve scientific understanding for realistic predictions of drought-induced tree mortality.
Journal ArticleDOI
Does carbon storage limit tree growth
Journal ArticleDOI
Non-structural carbohydrates in woody plants compared among laboratories.
Audrey G. Quentin,Audrey G. Quentin,Elizabeth A. Pinkard,Michael G. Ryan,Michael G. Ryan,David T. Tissue,L. Scott Baggett,Henry D. Adams,Pascale Maillard,Jacqueline Marchand,Simon M. Landhäusser,André Lacointe,André Lacointe,Yves Gibon,William R. L. Anderegg,Shinichi Asao,Owen K. Atkin,Marc Bonhomme,Marc Bonhomme,Caroline Claye,Pak S. Chow,Anne Clément-Vidal,Noel W. Davies,L. Turin Dickman,Rita Dumbur,David S. Ellsworth,Kristen Falk,Lucía Galiano,José M. Grünzweig,Henrik Hartmann,Günter Hoch,Sharon M. Hood,Joanna E. Jones,Takayoshi Koike,Iris Kuhlmann,Francisco Lloret,Melchor Maestro,Shawn D. Mansfield,Jordi Martínez-Vilalta,Mickaël Maucourt,Mickaël Maucourt,Nate G. McDowell,Annick Moing,Bertrand Muller,Sergio G. Nebauer,Ülo Niinemets,Sara Palacio,Frida I. Piper,Eran Raveh,Andreas Richter,Gaëlle Rolland,Teresa Rosas,Brigitte Saint Joanis,Brigitte Saint Joanis,Anna Sala,Renee Smith,Frank J. Sterck,Joseph R. Stinziano,Mari Tobias,Faride Unda,Makoto Watanabe,Danielle A. Way,Danielle A. Way,Lasantha K. Weerasinghe,Lasantha K. Weerasinghe,Birgit Wild,Birgit Wild,Erin Wiley,David R. Woodruff +68 more
TL;DR: It is shown that NSC estimates for woody plant tissues cannot be compared among laboratories, and users can either adopt the reference method given in this publication, or report estimates for a portion of samples using thereference method, and report estimates to a standard reference material.
Journal ArticleDOI
Research frontiers in drought-induced tree mortality: crossing scales and disciplines.
TL;DR: Sudden and widespread forest die-back and die-off and increased mortality rates in many forest ecosystems across the globe have been linked to drought and elevated temperatures and caused a focus on the physiological mechanisms of drought-induced tree mortality.
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