Holub, Petr and Klem, Karel and Linder, Sune and Urban, Otmar
(2019).
Distinct seasonal dynamics of responses to elevated CO2 in two understorey grass species differing in shade-tolerance.
Ecology and Evolution. 9
, 13663-13677
[Research article]
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Abstract
Understorey plant communities are crucial to maintain species diversity and ecosystem processes including nutrient cycling and regeneration of overstorey trees. Most studies exploring effects of elevated CO2 concentration ([CO2]) in forests have, however, been done on overstorey trees, while understorey communities received only limited attention. The hypothesis that understorey grass species differ in shade-tolerance and development dynamics, and temporally exploit different niches under elevated [CO2], was tested during the fourth year of [CO2] treatment. We assumed stimulated carbon gain by elevated [CO2] even at low light conditions in strongly shade-tolerant Luzula sylvatica, while its stimulation under elevated [CO2] in less shade-tolerant Calamagrostis arundinacea was expected only in early spring when the tree canopy is not fully developed. We found evidence supporting this hypothesis. While elevated [CO2] stimulated photosynthesis in L. sylvatica mainly in the peak of the growing season (by 55%-57% in July and August), even at low light intensities (50 mu mol m(-2) s(-1)), stimulatory effect of [CO2] in C. arundinacea was found mainly under high light intensities (200 mu mol m(-2) s(-1)) at the beginning of the growing season (increase by 171% in May) and gradually declined during the season. Elevated [CO2] also substantially stimulated leaf mass area and root-to-shoot ratio in L. sylvatica, while only insignificant increases were observed in C. arundinacea. Our physiological and morphological analyses indicate that understorey species, differing in shade-tolerance, under elevated [CO2] exploit distinct niches in light environment given by the dynamics of the tree canopy.
Authors/Creators: | Holub, Petr and Klem, Karel and Linder, Sune and Urban, Otmar | ||||||
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Title: | Distinct seasonal dynamics of responses to elevated CO2 in two understorey grass species differing in shade-tolerance | ||||||
Series Name/Journal: | Ecology and Evolution | ||||||
Year of publishing : | 2019 | ||||||
Volume: | 9 | ||||||
Page range: | 13663-13677 | ||||||
Number of Pages: | 15 | ||||||
Publisher: | Wiley | ||||||
ISSN: | 2045-7758 | ||||||
Language: | English | ||||||
Publication Type: | Research article | ||||||
Refereed: | Yes | ||||||
Article category: | Scientific peer reviewed | ||||||
Version: | Published version | ||||||
Copyright: | Creative Commons: Attribution 4.0 | ||||||
Full Text Status: | Public | ||||||
Subjects: | (A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology | ||||||
Keywords: | Calamagrostis arundinacea, ecological niche, glass domes, light environment, Luzula sylvatica, manipulation experiment, seasonal dynamics | ||||||
URN:NBN: | urn:nbn:se:slu:epsilon-p-103082 | ||||||
Permanent URL: | http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-103082 | ||||||
Additional ID: |
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ID Code: | 16646 | ||||||
Faculty: | S - Faculty of Forest Sciences | ||||||
Department: | (S) > Southern Swedish Forest Research Centre | ||||||
Deposited By: | SLUpub Connector | ||||||
Deposited On: | 05 Mar 2020 11:08 | ||||||
Metadata Last Modified: | 05 Mar 2020 11:08 |
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