The influence of soil temperature and water content on belowground hydraulic conductance and leaf gas exchange in mature trees of three boreal species

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Lintunen , A , Paljakka , T V S , Salmon , Y , Dewar , R , Riikonen , A & Hölttä , T 2020 , ' The influence of soil temperature and water content on belowground hydraulic conductance and leaf gas exchange in mature trees of three boreal species ' , Plant, Cell and Environment , vol. 43 , no. 3 , pp. 532-547 . https://doi.org/10.1111/pce.13709

Title: The influence of soil temperature and water content on belowground hydraulic conductance and leaf gas exchange in mature trees of three boreal species
Author: Lintunen, Anna; Paljakka, Teemu Ville Santeri; Salmon, Yann; Dewar, Roderick; Riikonen, Anu; Hölttä, Teemu
Contributor organization: INAR Physics
Ecosystem processes (INAR Forest Sciences)
Forest Ecology and Management
Institute for Atmospheric and Earth System Research (INAR)
Department of Forest Sciences
Micrometeorology and biogeochemical cycles
Viikki Plant Science Centre (ViPS)
Date: 2020-03
Language: eng
Number of pages: 16
Belongs to series: Plant, Cell and Environment
ISSN: 0140-7791
DOI: https://doi.org/10.1111/pce.13709
URI: http://hdl.handle.net/10138/323638
Abstract: Understanding stomatal regulation is fundamental to predicting the impact of changing environmental conditions on vegetation. However, the influence of soil temperature (ST) and soil water content (SWC) on canopy conductance (g(s)) through changes in belowground hydraulic conductance (k(bg)) remains poorly understood, because k(bg) has seldom been measured in field conditions. Our aim was to (a) examine the dependence of k(bg) on ST and SWC, (b) examine the dependence of g(s) on k(bg) and (c) test a recent stomatal optimization model according to which g(s) and soil-to-leaf hydraulic conductance are strongly coupled. We estimated k(bg) from continuous sap flow and xylem diameter measurements in three boreal species. k(bg) increased strongly with increasing ST when ST was below +8 degrees C, and typically increased with increasing SWC when ST was not limiting. g(s) was correlated with k(bg) in all three species, and modelled and measured g(s) were well correlated in Pinus sylvestris (a model comparison was only possible for this species). These results imply an important role for k(bg) in mediating linkages between the soil environment and leaf gas exchange. In particular, our finding that ST strongly influences k(bg) in mature trees may help us to better understand tree behaviour in cold environments.
Subject: 4112 Forestry
11831 Plant biology
belowground hydraulic conductance
cold
point dendrometer
sap flow
stomatal control
water relations
ASPEN POPULUS-TREMULOIDES
STEM DIAMETER VARIATIONS
LOW ROOT TEMPERATURE
SCOTS PINE
SAP FLOW
STOMATAL CONDUCTANCE
MECHANICAL ANALYSIS
ENGELMANN SPRUCE
TRUNK SHRINKAGE
PLANT WATER
Peer reviewed: Yes
Usage restriction: openAccess
Self-archived version: acceptedVersion


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