Functional traits and their plasticity shift from tolerant to avoidant under extreme drought.

Autor: Kramp RE; Plant Ecology Group, University of Tübingen, Tübingen, Germany., Liancourt P; Plant Ecology Group, University of Tübingen, Tübingen, Germany.; Botany Department, State Museum of Natural History Stuttgart, Stuttgart, Germany.; Institute of Botany, Czech Academy of Science, Prague, Czech Republic., Herberich MM; Institute of Botany, BOKU, Vienna, Austria., Saul L; Plant Ecology Group, University of Tübingen, Tübingen, Germany., Weides S; Department of Environmental Sciences, University of Basel, Basel, Switzerland., Tielbörger K; Plant Ecology Group, University of Tübingen, Tübingen, Germany., Májeková M; Plant Ecology Group, University of Tübingen, Tübingen, Germany.
Jazyk: angličtina
Zdroj: Ecology [Ecology] 2022 Dec; Vol. 103 (12), pp. e3826. Date of Electronic Publication: 2022 Sep 19.
DOI: 10.1002/ecy.3826
Abstrakt: Under climate change, extreme droughts will limit water availability for plants. However, the species-specific responses make it difficult to draw general conclusions. We hypothesized that changes in species' abundance in response to extreme drought can be best explained by a set of water economic traits under ambient conditions in combination with the ability to adjust these traits towards higher drought resistance. We conducted a 4-year field experiment in temperate grasslands using rainout shelters with 30% and 50% rainfall reduction. We quantified the response as the change in species abundance between ambient conditions and the rainfall reduction. Abundance response to extreme drought was best explained by a combination of traits in ambient conditions and their functional adjustment, most likely reflecting plasticity. Smaller leaved species decreased less in abundance under drought. With increasing drought intensity, we observed a shift from drought tolerance, i.e., an increase in leaf dry matter content, to avoidance, i.e., a less negative turgor loss point (TLP) in ambient conditions and a constancy in TLP under drought. We stress the importance of using a multidimensional approach of variation in multiple traits and the importance of considering a range of drought intensities to improve predictions of species' response to climate change.
(© 2022 The Authors. Ecology published by Wiley Periodicals LLC on behalf of The Ecological Society of America.)
Databáze: MEDLINE
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