Boreal forest tree growth and sap flow after a low-severity wildfire

Dukat, Paulina; Kelly, Julia; Doerr, Stefan; Edvardsson, Johannes; Hölttä, Teemu S.; Lehner, Irene; Lindroth, Anders; Nuno, Cristina Santin; Kljun, Natascha

doi:10.1016/j.agrformet.2024.109899

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Boreal forest tree growth and sap flow after a low-severity wildfire

Paulina Dukat

, Julia Kelly

, Stefan Doerr

, Johannes Edvardsson, Teemu S. Hölttä

, Irene Lehner

, Anders Lindroth, Cristina Santin Nuno, Natascha Kljun

Agricultural and Forest Meteorology, Volume: 347, Start page: 109899

Swansea University Authors: Stefan Doerr , Cristina Santin Nuno, Natascha Kljun

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DOI (Published version): 10.1016/j.agrformet.2024.109899

Abstract

Boreal forests are exposed to larger and more frequent fires due to climate change, with significant consequences for their carbon and water balances. Low-severity fires (trees charred but surviving) are the most common fire regime in the Eurasian boreal forest, but we still lack understanding on ho...

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Published in:	Agricultural and Forest Meteorology
ISSN:	0168-1923
Published:	Elsevier BV 2024
Online Access:	Check full text
URI:	https://cronfa.swan.ac.uk/Record/cronfa65775
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first_indexed	2024-03-05T22:39:55Z
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Low-severity fires (trees charred but surviving) are the most common fire regime in the Eurasian boreal forest, but we still lack understanding on how they impact tree functioning. This study focused on the dynamics of tree transpiration and stem growth of Pinus sylvestris in central Sweden after a large wildfire in 2018. We compared a stand impacted by low-severity fire (LM) with an unburnt stand (UM), over three years following the fire (2020–2022). We found that transpiration was on average lower and more variable within the stand at LM compared to UM. LM also had consistently lower stem growth compared to UM, resulting in larger accumulated growth for the unburnt site in the second to fourth year after the fire. Our results highlight the complex effects of low-severity fire on tree water cycling, with both direct (damage to tree xylem and roots) and indirect fire impacts (due to loss of understory vegetation and changes in soil properties). 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Considering the expected increase in frequency of droughts and forest fires at higher northern latitudes, such indirect fire impacts may put additional pressure on the boreal forest.</abstract><type>Journal Article</type><journal>Agricultural and Forest Meteorology</journal><volume>347</volume><journalNumber/><paginationStart>109899</paginationStart><paginationEnd/><publisher>Elsevier BV</publisher><placeOfPublication/><isbnPrint/><isbnElectronic/><issnPrint>0168-1923</issnPrint><issnElectronic/><keywords>2018 Drought; Eurasia; Forest fire; Nordic pine forest; Tree increment growth; Tree transpiration</keywords><publishedDay>15</publishedDay><publishedMonth>3</publishedMonth><publishedYear>2024</publishedYear><publishedDate>2024-03-15</publishedDate><doi>10.1016/j.agrformet.2024.109899</doi><url/><notes/><college>COLLEGE NANME</college><department>Geography</department><CollegeCode>COLLEGE CODE</CollegeCode><DepartmentCode>SGE</DepartmentCode><institution>Swansea University</institution><apcterm>Another institution paid the OA fee</apcterm><funders>This research was funded by FORMAS grants #2018-02700 and 2019-00836, and the Crafoord foundation grant 20190763. We thank Jukka Kuivaniemi for his support in accessing and establishing the sites. We are also grateful to Ellinor Delin, Margarida Soares, and Jonas Nilsson for their help conducting the vegetation surveys. The work was done in collaboration with the University of Helsinki in the framework of the project 342930 of the Academy of Finland and with Poznan university of Life Sciences in the framework of the project by General Directorate of the State Forests, Warsaw, Poland (project name: LAS IV 31/2021/B; contract no. 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spelling	v2 65775 2024-03-05 Boreal forest tree growth and sap flow after a low-severity wildfire 575eb5094f2328249328b3e43deb5088 0000-0002-8700-9002 Stefan Doerr Stefan Doerr true false 993c82cbaf875c1268156360e83c4dfd Cristina Santin Nuno Cristina Santin Nuno true false c96172d106206ba8c504317bb7887587 0000-0001-9650-2184 Natascha Kljun Natascha Kljun true false 2024-03-05 SGE Boreal forests are exposed to larger and more frequent fires due to climate change, with significant consequences for their carbon and water balances. Low-severity fires (trees charred but surviving) are the most common fire regime in the Eurasian boreal forest, but we still lack understanding on how they impact tree functioning. This study focused on the dynamics of tree transpiration and stem growth of Pinus sylvestris in central Sweden after a large wildfire in 2018. We compared a stand impacted by low-severity fire (LM) with an unburnt stand (UM), over three years following the fire (2020–2022). We found that transpiration was on average lower and more variable within the stand at LM compared to UM. LM also had consistently lower stem growth compared to UM, resulting in larger accumulated growth for the unburnt site in the second to fourth year after the fire. Our results highlight the complex effects of low-severity fire on tree water cycling, with both direct (damage to tree xylem and roots) and indirect fire impacts (due to loss of understory vegetation and changes in soil properties). Trees affected by low-severity fire also exhibited reduced resilience to water shortages. Considering the expected increase in frequency of droughts and forest fires at higher northern latitudes, such indirect fire impacts may put additional pressure on the boreal forest. Journal Article Agricultural and Forest Meteorology 347 109899 Elsevier BV 0168-1923 2018 Drought; Eurasia; Forest fire; Nordic pine forest; Tree increment growth; Tree transpiration 15 3 2024 2024-03-15 10.1016/j.agrformet.2024.109899 COLLEGE NANME Geography COLLEGE CODE SGE Swansea University Another institution paid the OA fee This research was funded by FORMAS grants #2018-02700 and 2019-00836, and the Crafoord foundation grant 20190763. We thank Jukka Kuivaniemi for his support in accessing and establishing the sites. We are also grateful to Ellinor Delin, Margarida Soares, and Jonas Nilsson for their help conducting the vegetation surveys. The work was done in collaboration with the University of Helsinki in the framework of the project 342930 of the Academy of Finland and with Poznan university of Life Sciences in the framework of the project by General Directorate of the State Forests, Warsaw, Poland (project name: LAS IV 31/2021/B; contract no. EZ.271.3.3.2021). 2024-04-25T16:09:01.7035140 2024-03-05T22:37:41.2947898 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Geography Paulina Dukat 0000-0002-5001-2603 1 Julia Kelly 0000-0002-7370-1401 2 Stefan Doerr 0000-0002-8700-9002 3 Johannes Edvardsson 4 Teemu S. Hölttä 0000-0001-7677-7156 5 Irene Lehner 0000-0002-2263-6734 6 Anders Lindroth 7 Cristina Santin Nuno 8 Natascha Kljun 0000-0001-9650-2184 9 65775__29648__dbc0d316b6174d35a82f17092adc3072.pdf 2024_Dukat_sap flow boreal fire_AFM.pdf 2024-03-05T22:39:03.3100209 Output 9126636 application/pdf Version of Record true © 2024 The Author(s). This is an open access article under the CC BY license. true eng https://creativecommons.org/licenses/by/4.0/
title	Boreal forest tree growth and sap flow after a low-severity wildfire
spellingShingle	Boreal forest tree growth and sap flow after a low-severity wildfire Stefan Doerr Cristina Santin Nuno Natascha Kljun
title_short	Boreal forest tree growth and sap flow after a low-severity wildfire
title_full	Boreal forest tree growth and sap flow after a low-severity wildfire
title_fullStr	Boreal forest tree growth and sap flow after a low-severity wildfire
title_full_unstemmed	Boreal forest tree growth and sap flow after a low-severity wildfire
title_sort	Boreal forest tree growth and sap flow after a low-severity wildfire
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author	Stefan Doerr Cristina Santin Nuno Natascha Kljun
author2	Paulina Dukat Julia Kelly Stefan Doerr Johannes Edvardsson Teemu S. Hölttä Irene Lehner Anders Lindroth Cristina Santin Nuno Natascha Kljun
format	Journal article
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publishDate	2024
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doi_str_mv	10.1016/j.agrformet.2024.109899
publisher	Elsevier BV
college_str	Faculty of Science and Engineering
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description	Boreal forests are exposed to larger and more frequent fires due to climate change, with significant consequences for their carbon and water balances. Low-severity fires (trees charred but surviving) are the most common fire regime in the Eurasian boreal forest, but we still lack understanding on how they impact tree functioning. This study focused on the dynamics of tree transpiration and stem growth of Pinus sylvestris in central Sweden after a large wildfire in 2018. We compared a stand impacted by low-severity fire (LM) with an unburnt stand (UM), over three years following the fire (2020–2022). We found that transpiration was on average lower and more variable within the stand at LM compared to UM. LM also had consistently lower stem growth compared to UM, resulting in larger accumulated growth for the unburnt site in the second to fourth year after the fire. Our results highlight the complex effects of low-severity fire on tree water cycling, with both direct (damage to tree xylem and roots) and indirect fire impacts (due to loss of understory vegetation and changes in soil properties). Trees affected by low-severity fire also exhibited reduced resilience to water shortages. Considering the expected increase in frequency of droughts and forest fires at higher northern latitudes, such indirect fire impacts may put additional pressure on the boreal forest.
published_date	2024-03-15T16:09:01Z
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Boreal forest tree growth and sap flow after a low-severity wildfire

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