Species-specific stomatal response of trees to drought - a link to vegetation dynamics?

Zweifel, Roman; Rigling, Andreas; Dobbertin, Matthias (2009). Species-specific stomatal response of trees to drought - a link to vegetation dynamics? Journal of vegetation science, 20(3), pp. 442-454. Malden, Mass.: Wiley-Blackwell 10.1111/j.1654-1103.2009.05701.x

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Question: Is stomatal regulation specific for climate and tree species, and does it reveal species-specific responses to drought? Is there a link to vegetation dynamics? Location: Dry inner alpine valley, Switzerland Methods: Stomatal aperture (θE) of Pinus sylvestris, Quercus pubescens, Juniperus communis and Picea abies were continuously estimated by the ratio of measured branch sap flow rates to potential transpiration rates (adapted Penman-Monteith single leaf approach) at 10-min intervals over four seasons. Results: θE proved to be specific for climate and species and revealed distinctly different drought responses: Pinus stomata close disproportionately more than neighbouring species under dry conditions, but has a higher θE than the other species when weather was relatively wet and cool. Quercus keeps stomata more open under drought stress but has a lower θE under humid conditions. Juniperus was most drought-tolerant, whereas Picea stomata close almost completely during summer. Conclusions: The distinct microclimatic preferences of the four tree species in terms of θE strongly suggest that climate (change) is altering tree physiological performances and thus species-specific competitiveness. Picea and Pinus currently live at the physiological limit of their ability to withstand increasing temperature and drought intensities at the sites investigated, whereas Quercus and Juniperus perform distinctly better. This corresponds, at least partially, with regional vegetation dynamics: Pinus has strongly declined, whereas Quercus has significantly increased in abundance in the past 30 years. We conclude that θE provides an indication of a species' ability to cope with current and predicted climate.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS)
08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS) > Vegetation Ecology (discontinued)

UniBE Contributor:

Zweifel, Roman Franz

Subjects:

500 Science > 580 Plants (Botany)

ISSN:

1100-9233

Publisher:

Wiley-Blackwell

Language:

English

Submitter:

Peter Alfred von Ballmoos-Haas

Date Deposited:

04 Oct 2013 15:21

Last Modified:

10 May 2019 11:35

Publisher DOI:

10.1111/j.1654-1103.2009.05701.x

Web of Science ID:

000266244100007

BORIS DOI:

10.7892/boris.36330

URI:

https://boris.unibe.ch/id/eprint/36330 (FactScience: 204347)

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