Weaker Light Response, Lower Stomatal Conductance and Structural Changes in Old Boreal Conifers Implied by a Bayesian Hierarchical Model

Show full item record



Permalink

http://hdl.handle.net/10138/321280

Citation

Liu , C , Hölttä , T , Tian , X , Berninger , F & Mäkelä , A 2020 , ' Weaker Light Response, Lower Stomatal Conductance and Structural Changes in Old Boreal Conifers Implied by a Bayesian Hierarchical Model ' , Frontiers in plant science , vol. 11 , 579319 . https://doi.org/10.3389/fpls.2020.579319

Title: Weaker Light Response, Lower Stomatal Conductance and Structural Changes in Old Boreal Conifers Implied by a Bayesian Hierarchical Model
Author: Liu, Che; Hölttä, Teemu; Tian, Xianglin; Berninger, Frank; Mäkelä, Annikki
Contributor organization: Ecosystem processes (INAR Forest Sciences)
Department of Forest Sciences
Institute for Atmospheric and Earth System Research (INAR)
Viikki Plant Science Centre (ViPS)
Forest Ecology and Management
Forest Modelling Group
Date: 2020-11-06
Language: eng
Number of pages: 15
Belongs to series: Frontiers in plant science
ISSN: 1664-462X
DOI: https://doi.org/10.3389/fpls.2020.579319
URI: http://hdl.handle.net/10138/321280
Abstract: Age-related effects on whole-tree hydraulics are one of the key challenges to better predicting the production and growth of old-growth forests. Previous models have described the optimal state of stomatal behaviour, and field studies have implied on age/size-induced trends in tree ecophysiology related to hydraulics. On these bases, we built a Bayesian hierarchical model to link sap flow density and drivers of transpiration directly. The model included parameters with physiological meanings and accounted for variations in leaf-sapwood area ratio and the time lag between sap flow and transpiration. The model well-simulated the daily pattern of sap flow density and the variation between tree age groups. The results of parameterization show that (1) the usually higher stomatal conductance in young than old trees during mid-summer was mainly because the sap flow of young trees were more activated at low to medium light intensity, and (2) leaf-sapwood area ratio linearly decreased while time lag linearly increased with increasing tree height. Uncertainty partitioning and cross-validation, respectively, indicated a reliable and fairly robust parameter estimation. The model performance may be further improved by higher data quality and more process-based expressions of the internal dynamics of trees.
Subject: 4112 Forestry
age-related effect
bayesian hierarchical modelling
whole-tree hydraulics
sap flow
stomatal conductance
leaf-sapwood area ratio
STEM DIAMETER VARIATIONS
SCOTS PINE
SAP FLOW
TREE HEIGHT
SAPWOOD AREA
HYDRAULIC CONDUCTANCE
LEAF-AREA
PHOTOSYNTHETIC RATES
THERMAL DISSIPATION
USE EFFICIENCY
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion


Files in this item

Total number of downloads: Loading...

Files Size Format View
fpls_11_579319.pdf 2.522Mb PDF View/Open

This item appears in the following Collection(s)

Show full item record