Balancing the risks of hydraulic failure and carbon starvation : a twig scale analysis in declining Scots pine

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http://hdl.handle.net/10138/209572

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Salmon , Y , Torres-Ruiz , J M , Poyatos , R , Martinez-Vilalta , J , Meir , P , Cochard , H & Mencuccini , M 2015 , ' Balancing the risks of hydraulic failure and carbon starvation : a twig scale analysis in declining Scots pine ' Plant, Cell and Environment , vol. 38 , no. 12 , pp. 2575-2588 . DOI: 10.1111/pce.12572

Title: Balancing the risks of hydraulic failure and carbon starvation : a twig scale analysis in declining Scots pine
Author: Salmon, Yann; Torres-Ruiz, Jose M.; Poyatos, Rafael; Martinez-Vilalta, Jordi; Meir, Patrick; Cochard, Herve; Mencuccini, Maurizio
Contributor: University of Helsinki, Ecosystem processes/ Jaana Bäck
Date: 2015-12
Language: eng
Number of pages: 14
Belongs to series: Plant, Cell and Environment
ISSN: 0140-7791
URI: http://hdl.handle.net/10138/209572
Abstract: Understanding physiological processes involved in drought-induced mortality is important for predicting the future of forests and for modelling the carbon and water cycles. Recent research has highlighted the variable risks of carbon starvation and hydraulic failure in drought-exposed trees. However, little is known about the specific responses of leaves and supporting twigs, despite their critical role in balancing carbon acquisition and water loss. Comparing healthy (non-defoliated) and unhealthy (defoliated) Scots pine at the same site, we measured the physiological variables involved in regulating carbon and water resources. Defoliated trees showed different responses to summer drought compared with non-defoliated trees. Defoliated trees maintained gas exchange while non-defoliated trees reduced photosynthesis and transpiration during the drought period. At the branch scale, very few differences were observed in non-structural carbohydrate concentrations between health classes. However, defoliated trees tended to have lower water potentials and smaller hydraulic safety margins. While non-defoliated trees showed a typical response to drought for an isohydric species, the physiology appears to be driven in defoliated trees by the need to maintain carbon resources in twigs. These responses put defoliated trees at higher risk of branch hydraulic failure and help explain the interaction between carbon starvation and hydraulic failure in dying trees.
Subject: drought
ecophysiology
leaf gas exchange
mortality
NSC
photosynthesis
transpiration
tree
DROUGHT-INDUCED MORTALITY
INDUCED TREE MORTALITY
NE IBERIAN PENINSULA
LEAF GAS-EXCHANGE
SYLVESTRIS L.
SPATIAL INTERPOLATION
CARBOHYDRATE DYNAMICS
VEGETATION MORTALITY
XYLEM CAVITATION
PUBESCENT OAK
4112 Forestry
114 Physical sciences
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