Tree water relations can trigger monoterpene emissions from Scots pine stems during spring recovery

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Vanhatalo , A , Chan , T , Aalto , J , Korhonen , J F , Kolari , P , Holtta , T , Nikinmaa , E & Back , J 2015 , ' Tree water relations can trigger monoterpene emissions from Scots pine stems during spring recovery ' , Biogeosciences , vol. 12 , no. 18 , pp. 5353-5363 . https://doi.org/10.5194/bg-12-5353-2015

Title: Tree water relations can trigger monoterpene emissions from Scots pine stems during spring recovery
Author: Vanhatalo, A.; Chan, T.; Aalto, J.; Korhonen, J. F.; Kolari, P.; Holtta, T.; Nikinmaa, E.; Back, J.
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
University of Helsinki, Department of Physics
University of Helsinki, Department of Forest Sciences
University of Helsinki, Department of Forest Sciences
University of Helsinki, Department of Forest Sciences
Date: 2015
Language: eng
Number of pages: 11
Belongs to series: Biogeosciences
ISSN: 1726-4170
URI: http://hdl.handle.net/10138/161792
Abstract: Tree canopies are known to emit large amounts of VOCs( volatile organic compounds) such as monoterpenes into the surrounding air. High VOC emission rates from bo-real forests have been observed during the transition from winter to summer activity. The most important sources of these are considered to be the green foliage, understory vegetation and soil organisms, but emissions from the living stand woody compartments have so far not been quantified. We analyzed whether the non-foliar components could partially explain the springtime high emission rates. We measured the monoterpene emissions from Scots pine( Pinus sylvestris L.) stem and shoots during the dehardening phase of trees in field conditions in two consecutive springs. We observed a large, transient monoterpene burst from the stem, while the shoot monoterpene emissions remained low. The burst lasted about 12 h. Simultaneously, an unusual nighttime sap flow and a non-systematic diurnal pattern of tree diameter were detected. Hence, we suggest that the monoterpene burst was a consequence of the recovery of the stem from wintertime, and likely related to the refilling of embolized tracheids and/or phenological changes in the living cells of the stem. This indicates that the dominant processes and environmental drivers triggering the monoterpene emissions are different between the stem and the foliage.
Subject: HYDRAULIC CONDUCTIVITY RECOVERY
ORGANIC-COMPOUND EMISSIONS
REACTION MASS-SPECTROMETRY
DIAMETER VARIATION
WINTER EMBOLISM
PLANT VOLATILES
XYLEM RECOVERY
VOC EMISSIONS
4112 Forestry
114 Physical sciences
1172 Environmental sciences
1171 Geosciences
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