Branch water uptake and redistribution in two conifers at the alpine treeline

Abstract During winter, conifers at the alpine treeline suffer dramatic losses of hydraulic conductivity, which are successfully recovered during late winter. Previous studies indicated branch water uptake to support hydraulic recovery. We analyzed water absorption and redistribution in Picea abies...

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Autores principales:	Adriano Losso, Andreas Bär, Lucrezia Unterholzner, Michael Bahn, Stefan Mayr
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/9697c39ba8a34d3c9fc737ea4dbf1a55
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spelling	oai:doaj.org-article:9697c39ba8a34d3c9fc737ea4dbf1a552021-11-21T12:21:06ZBranch water uptake and redistribution in two conifers at the alpine treeline10.1038/s41598-021-00436-x2045-2322https://doaj.org/article/9697c39ba8a34d3c9fc737ea4dbf1a552021-11-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-00436-xhttps://doaj.org/toc/2045-2322Abstract During winter, conifers at the alpine treeline suffer dramatic losses of hydraulic conductivity, which are successfully recovered during late winter. Previous studies indicated branch water uptake to support hydraulic recovery. We analyzed water absorption and redistribution in Picea abies and Larix decidua growing at the treeline by in situ exposure of branches to δ2H-labelled water. Both species suffered high winter embolism rates (> 40–60% loss of conductivity) and recovered in late winter (< 20%). Isotopic analysis showed water to be absorbed over branches and redistributed within the crown during late winter. Labelled water was redistributed over 425 ± 5 cm within the axes system and shifted to the trunk, lower and higher branches (tree height 330 ± 40 cm). This demonstrated relevant branch water uptake and re-distribution in treeline conifers. The extent of water absorption and re-distribution was species-specific, with L. decidua showing higher rates. In natura, melting snow might be the prime source for absorbed and redistributed water, enabling embolism repair and restoration of water reservoirs prior to the vegetation period. Pronounced water uptake in the deciduous L. decidua indicated bark to participate in the process of water absorption.Adriano LossoAndreas BärLucrezia UnterholznerMichael BahnStefan MayrNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Adriano Losso Andreas Bär Lucrezia Unterholzner Michael Bahn Stefan Mayr Branch water uptake and redistribution in two conifers at the alpine treeline
description	Abstract During winter, conifers at the alpine treeline suffer dramatic losses of hydraulic conductivity, which are successfully recovered during late winter. Previous studies indicated branch water uptake to support hydraulic recovery. We analyzed water absorption and redistribution in Picea abies and Larix decidua growing at the treeline by in situ exposure of branches to δ2H-labelled water. Both species suffered high winter embolism rates (> 40–60% loss of conductivity) and recovered in late winter (< 20%). Isotopic analysis showed water to be absorbed over branches and redistributed within the crown during late winter. Labelled water was redistributed over 425 ± 5 cm within the axes system and shifted to the trunk, lower and higher branches (tree height 330 ± 40 cm). This demonstrated relevant branch water uptake and re-distribution in treeline conifers. The extent of water absorption and re-distribution was species-specific, with L. decidua showing higher rates. In natura, melting snow might be the prime source for absorbed and redistributed water, enabling embolism repair and restoration of water reservoirs prior to the vegetation period. Pronounced water uptake in the deciduous L. decidua indicated bark to participate in the process of water absorption.
format	article
author	Adriano Losso Andreas Bär Lucrezia Unterholzner Michael Bahn Stefan Mayr
author_facet	Adriano Losso Andreas Bär Lucrezia Unterholzner Michael Bahn Stefan Mayr
author_sort	Adriano Losso
title	Branch water uptake and redistribution in two conifers at the alpine treeline
title_short	Branch water uptake and redistribution in two conifers at the alpine treeline
title_full	Branch water uptake and redistribution in two conifers at the alpine treeline
title_fullStr	Branch water uptake and redistribution in two conifers at the alpine treeline
title_full_unstemmed	Branch water uptake and redistribution in two conifers at the alpine treeline
title_sort	branch water uptake and redistribution in two conifers at the alpine treeline
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/9697c39ba8a34d3c9fc737ea4dbf1a55
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Branch water uptake and redistribution in two conifers at the alpine treeline

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