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Distinct seasonal dynamics of responses to elevated CO2 in two understorey grass species differing in shade-tolerance

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
[Journal 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
Title:Distinct seasonal dynamics of responses to elevated CO2 in two understorey grass species differing in shade-tolerance
Year of publishing :2019
Volume:9
Page range:13663-13677
Number of Pages:15
Publisher:Wiley
ISSN:2045-7758
Language:English
Publication Type:Journal 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:
Type of IDID
DOI10.1002/ece3.5738
Web of Science (WoS)000499282000001
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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