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How tree species, tree size, and topographical location influenced tree transpiration in northern boreal forests during the historic 2018 drought

Gutierrez Lopez, Jose and Tor-Ngern, Pantana and Oren, Ram and Kozii, Nataliia and Laudon, Hjalmar and Hasselquist, Niles (2021). How tree species, tree size, and topographical location influenced tree transpiration in northern boreal forests during the historic 2018 drought. Global Change Biology. 27 , 3066-3078
[Research article]

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Abstract

Trees in northern latitude ecosystems are projected to experience increasing drought stress as a result of rising air temperatures and changes in precipitation patterns in northern latitude ecosystems. However, most drought-related studies on high-latitude boreal forests (>50 degrees N) have been conducted in North America, with few studies quantifying the response in European and Eurasian boreal forests. Here, we tested how daily whole-tree transpiration (Q, Liters day(-1)) and Q normalized for mean daytime vapor pressure deficit (Q(DZ), Liters day(-1) kPa(-1)) were affected by the historic 2018 drought in Europe. More specifically, we examined how tree species, size, and topographic position affected drought response in high-latitude mature boreal forest trees. We monitored 30 Pinus sylvestris (pine) and 30 Picea abies (spruce) trees distributed across a topographic gradient in northern Sweden. In general, pine showed a greater Q(DZ) control compared to spruce during periods of severe drought (standardized precipitation-evapotranspiration index: SPEI < -1.5), suggesting that the latter are more sensitive to drought. Overall, Q(DZ) reductions (using non-drought Q(DZ) as reference) were less pronounced in larger trees during severe drought, but there was a species-specific pattern: Q(DZ) reductions were greater in pine trees at high elevations and greater in spruce trees at lower elevations. Despite lower Q(DZ) during severe drought, drought spells were interspersed with small precipitation events and overcast conditions, and Q(DZ) returned to pre-drought conditions relatively quickly. This study highlights unique species-specific responses to drought, which are additionally driven by a codependent interaction among tree size, relative topographic position, and unique regional climate conditions.

Authors/Creators:Gutierrez Lopez, Jose and Tor-Ngern, Pantana and Oren, Ram and Kozii, Nataliia and Laudon, Hjalmar and Hasselquist, Niles
Title:How tree species, tree size, and topographical location influenced tree transpiration in northern boreal forests during the historic 2018 drought
Series Name/Journal:Global Change Biology
Year of publishing :2021
Volume:27
Page range:3066-3078
Number of Pages:13
Publisher:WILEY
ISSN:1354-1013
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution-Noncommercial 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:drought, Norway spruce, sap flow, Scotts pine, topographic position, tree size, tree transpiration
URN:NBN:urn:nbn:se:slu:epsilon-p-112023
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-112023
Additional ID:
Type of IDID
DOI10.1111/gcb.15601
Web of Science (WoS)000647124300001
ID Code:24778
Faculty:S - Faculty of Forest Sciences
Department:(S) > Dept. of Forest Ecology and Management
Deposited By: SLUpub Connector
Deposited On:01 Jul 2021 10:25
Metadata Last Modified:01 Jul 2021 10:31

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