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Tytuł:
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Effects of moisture dynamics on bryophyte carbon fluxes in a tropical cloud forest.
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Autorzy:
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Metcalfe DB; Department of Physical Geography and Ecosystem Science, Lund University, SE-223 62, Lund, Sweden.; Department of Ecology and Environmental Science, Umeå University, SE-901 83, Umeå, Sweden.
Ahlstrand JCM; Department of Physical Geography and Ecosystem Science, Lund University, SE-223 62, Lund, Sweden.; County Administrative Board, Hamngatan 4, SE-551 86, Jönköping, Sweden.
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Źródło:
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The New phytologist [New Phytol] 2019 Jun; Vol. 222 (4), pp. 1766-1777. Date of Electronic Publication: 2019 Mar 04.
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Typ publikacji:
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Journal Article; Research Support, Non-U.S. Gov't
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Język:
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English
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Imprint Name(s):
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Publication: Oxford : Wiley on behalf of New Phytologist Trust
Original Publication: London, New York [etc.] Academic Press.
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MeSH Terms:
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Carbon Cycle*
Forests*
Humidity*
Tropical Climate*
Bryophyta/*physiology
Analysis of Variance ; Bryophyta/radiation effects ; Carbon Dioxide/metabolism ; Cell Respiration/radiation effects ; Desiccation ; Ecosystem ; Light ; Photosynthesis/radiation effects ; Rain
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Contributed Indexing:
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Keywords: ecophysiology; global change ecology; mesocosm experiment; photosynthesis; plant-climate interactions; rainfall frequency; respiration; tropical montane cloud forest
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Substance Nomenclature:
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142M471B3J (Carbon Dioxide)
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Entry Date(s):
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Date Created: 20190205 Date Completed: 20200227 Latest Revision: 20200930
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Update Code:
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20240105
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DOI:
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10.1111/nph.15727
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PMID:
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30716175
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Bryophytes play key roles in the ecological function of a number of major world biomes but remain understudied compared with vascular plants. Little is known about bryophyte responses to different aspects of predicted changes in moisture dynamics with climate change. In this study, CO 2 fluxes and photosynthetic light responses were measured within bryophyte mesocosms, being subjected to different amounts, frequencies, and types (mist or rainfall) of water addition, both before and after different periods of complete desiccation. Bryophyte carbon fluxes and photosynthetic light response were generally affected by the magnitude and type, but not frequency, of watering events. Desiccation suppressed bryophyte carbon uptake even after rehydration, and the degree of uptake suppression progressively increased with desiccation duration. Estimated ecosystem-level bryophyte respiration and net carbon uptake were c. 58% and c. 3%, respectively, of corresponding fluxes from tree foliage at the site. Our results suggest that a simplified representation of precipitation processes may be sufficient to accurately model bryophyte carbon cycling under future climate scenarios. Further, we find that projected increases in drought could have strong negative impacts on bryophyte and ecosystem carbon storage, with major consequences for a wide range of ecosystem processes.
(© 2019 The Authors. New Phytologist © 2019 New Phytologist Trust.)
