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Tytuł pozycji:

Elevated CO2 and warming effects on grassland plant mortality are determined by the timing of rainfall.

Tytuł :
Elevated CO2 and warming effects on grassland plant mortality are determined by the timing of rainfall.
Autorzy :
Hovenden MJ; School of Biological Sciences, University of Tasmania, Hobart, 7001, Tasmania, Australia.
Newton PCD; Land & Environmental Management, AgResearch, Palmerston North, New Zealand.
Porter M; School of Biological Sciences, University of Tasmania, Hobart, 7001, Tasmania, Australia.
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Źródło :
Annals of botany [Ann Bot] 2017 May 01; Vol. 119 (7), pp. 1225-1233.
Typ publikacji :
Journal Article
Język :
English
Imprint Name(s) :
Publication: 2002- : Oxford, UK : Oxford University Press
Original Publication: Oxford [etc.]
MeSH Terms :
Climate Change*
Grassland*
Rain*
Carbon Dioxide/*analysis
Poaceae/*physiology
Australia ; Temperature
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Contributed Indexing :
Keywords: Climate change*; FACE*; elevated CO2*; global warming*; grassland*; mortality*; rainfall timing*; survivorship*
Substance Nomenclature :
142M471B3J (Carbon Dioxide)
Entry Date(s) :
Date Created: 20170324 Date Completed: 20171219 Latest Revision: 20181202
Update Code :
20210210
PubMed Central ID :
PMC5604550
DOI :
10.1093/aob/mcx006
PMID :
28334161
Czasopismo naukowe
Background and Aims: Global warming is expected to increase the mortality rate of established plants in water-limited systems because of its effect on evapotranspiration. The rising CO 2 concentration ([CO 2 ]), however, should have the opposite effect because it reduces plant transpiration, delaying the onset of drought. This potential for elevated [CO 2 ] (eCO 2 ) to modify the warming effect on mortality should be related to prevailing moisture conditions. This study aimed to determine the impacts of warming by 2 °C and eCO 2 (550 μmol mol -1 ) on plant mortality in an Australian temperate grassland over a 6-year period and to test how interannual variation in rainfall influenced treatment effects.
Methods: Analyses were based on results from a field experiment, TasFACE, in which grassland plots were exposed to a combination of eCO 2 by free air CO 2 enrichment (FACE) and warming by infrared heaters. Using an annual census of established plants and detailed estimates of recruitment, annual mortality of all established plants was calculated. The influence of rainfall amount and timing on the relative impact of treatments on mortality in each year was analysed using multiple regression techniques.
Key Results: Warming and eCO 2 effects had an interactive influence on mortality which varied strongly from year to year and this variation was determined by temporal rainfall patterns. Warming tended to increase density-adjusted mortality and eCO 2 moderated that effect, but to a greater extent in years with fewer dry periods.
Conclusions: These results show that eCO 2 reduced the negative effect of warming but this influence varied strongly with rainfall timing. Importantly, indices involving the amount of rainfall were not required to explain interannual variation in mortality or treatment effects on mortality. Therefore, predictions of global warming effects on plant mortality will be reliant not only on other climate change factors, but also on the temporal distribution of rainfall.
(© The Author 2017. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. For Permissions, please email: journals.permissions@oup.com)

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