Plant, cell and environment, 2016-02, Vol.39 (2), p.233-244
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.
This paper introduces a model that separates water‐potential induced changes from field‐sampled dendrometer measurements, revealing a cambial growth and osmotic concentration signal. Using this signal, we investigate how environmental factors influence stem growth and tree physiology, which would otherwise be masked by water‐related changes. This is important for understanding how factors affect physiological processes of the tree and developing a robust method to quantifying osmotic‐related stem radial changes and stem growth.
hydraulic conductance ; xylem ; phloem ; dendrometer ; elasticity ; Temperature ; Xylem - physiology ; Osmosis ; Photons ; Pressure ; Plant Stems - physiology ; Cambium - growth & development ; Regression Analysis ; Rain ; Environment ; Seasons ; Photosynthesis ; Water - physiology ; Plant Stems - growth & development ; Water ; Physiological aspects ; Erythromycin ; Growth ; Analysis
Alma/SFX Local Collection
Permalink to record