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  High temperature causes negative whole-plant carbon balance under mild drought

Zhao, J., Hartmann, H., Trumbore, S. E., Ziegler, W., & Zhang, Y. (2013). High temperature causes negative whole-plant carbon balance under mild drought. New Phytologist, 200(2), 330-339. doi:10.1111/nph.12400.

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http://dx.doi.org/10.1111/nph.12400 (Publisher version)
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 Creators:
Zhao, Junbin1, Author           
Hartmann, Henrik2, Author           
Trumbore, Susan E.1, Author           
Ziegler, Waldemar1, Author           
Zhang, Yiping, Author
Affiliations:
1Department Biogeochemical Processes, Prof. S. E. Trumbore, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497752              
2Tree Mortality Mechanisms, Dr. H. Hartmann, Department Biogeochemical Processes, Prof. S. E. Trumbore, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497781              

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 Abstract: Theoretically, progressive drought can force trees into negative carbon (C) balance by reducing stomatal conductance to prevent water loss, which also decreases C assimilation. At higher temperatures, negative C balance should be initiated at higher soil moisture because of increased respiratory demand and earlier stomatal closure. Few data are available on how these theoretical relationships integrate over the whole plant. We exposed Thuja occidentalis to progressive drought under three temperature conditions (15, 25, and 35°C), and measured C and water fluxes using a whole-tree chamber design. High transpiration rates at higher temperatures led to a rapid decline in soil moisture. During the progressive drought, soil moisture-driven changes in photosynthesis had a greater impact on the whole-plant C balance than respiration. The soil moisture content at which wholeplant C balance became negative increased with temperature, mainly as a result of higher respiration rates and an earlier onset of stomatal closure under a warmer condition. Our results suggest that the effect of drought on whole-plant C balance is highly temperature- dependent. High temperature causes a negative C balance even under mild drought and may increase the risk of C starvation.

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 Dates: 2013-06-062013-07-042013
 Publication Status: Issued
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 Identifiers: Other: BGC1864
DOI: 10.1111/nph.12400
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Title: New Phytologist
  Other : New Phytol.
Source Genre: Journal
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Publ. Info: London : Academic Press.
Pages: - Volume / Issue: 200 (2) Sequence Number: - Start / End Page: 330 - 339 Identifier: ISSN: 0028-646X
CoNE: https://pure.mpg.de/cone/journals/resource/954925334695