Separating water-potential induced swelling and shrinking from measured radial stem variations reveals a cambial growth and osmotic concentration signal

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http://hdl.handle.net/10138/208489

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Chan , T , Hölttä , T , Berninger , F , Mäkinen , H , Nöjd , P , Mencuccini , M & Nikinmaa , E 2016 , ' Separating water-potential induced swelling and shrinking from measured radial stem variations reveals a cambial growth and osmotic concentration signal ' , Plant, Cell and Environment , vol. 39 , no. 2 , pp. 233-244 . https://doi.org/10.1111/pce.12541

Title: Separating water-potential induced swelling and shrinking from measured radial stem variations reveals a cambial growth and osmotic concentration signal
Author: Chan, Tommy; Hölttä, Teemu; Berninger, Frank; Mäkinen, Harri; Nöjd, Pekka; Mencuccini, Maurizio; Nikinmaa, Eero
Contributor: University of Helsinki, Department of Forest Sciences
University of Helsinki, Department of Forest Sciences
University of Helsinki, Department of Forest Sciences
University of Helsinki, Department of Forest Sciences
Date: 2016-02
Language: eng
Number of pages: 12
Belongs to series: Plant, Cell and Environment
ISSN: 0140-7791
URI: http://hdl.handle.net/10138/208489
Abstract: The quantification of cambial growth over short time periods has been hampered by problems to discern between growth and the swelling and shrinking of a tree stem. This paper presents a model, which separates cambial growth and reversible water-potential induced diurnal changes from simultaneously measured whole stem and xylem radial variations, from field-measured Scots pine trees in Finland. The modelled growth, which includes osmotic concentration changes, was compared with (direct) dendrometer measurements and microcore samples. In addition, the relationship of modelled growth and dendrometer measurements to environmental factors was analysed. The results showed that the water-potential induced changes of tree radius were successfully separated from stem growth. Daily growth predicted by the model exhibited a high correlation with the modelled daily changes of osmotic concentration in phloem, and a temperature dependency in early summer. Late-summer growth saw higher dependency on water availability and temperature. Evaluation of the model against dendrometer measurements showed that the latter masked a true environmental signal in stem growth due to water-potential induced changes. The model provides better understanding of radial growth physiology and offers potential to examine growth dynamics and changes due to osmotic concentration, and how the environment affects growth.
Subject: dendrometer
elasticity
hydraulic conductance
phloem
xylem
INTRAANNUAL TRACHEID PRODUCTION
SCOTS PINE STEMS
DIAMETER VARIATIONS
WOOD FORMATION
ENVIRONMENTAL-FACTORS
NORWAY SPRUCE
PICEA-ABIES
SAP FLOW
TRANSPORT MODEL
SUGAR-TRANSPORT
4112 Forestry
1183 Plant biology, microbiology, virology
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