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| Titel |
Impacts of soil moisture on de novo monoterpene emissions from European beech, Holm oak, Scots pine, and Norway spruce |
| VerfasserIn |
C. Wu, I. Pullinen, S. Andres, G. Carriero, S. Fares, H. Goldbach, L. Hacker, T. Kasal, A. Kiendler-Scharr, E. Kleist, E. Paoletti, A. Wahner, J. Wildt, Th. F. Mentel |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 12, no. 1 ; Nr. 12, no. 1 (2015-01-09), S.177-191 |
| Datensatznummer |
250117765
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| Publikation (Nr.) |
 copernicus.org/bg-12-177-2015.pdf |
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| Zusammenfassung |
Impacts of soil moisture on de novo monoterpene (MT) emissions from Holm oak,
European beech, Scots pine, and Norway spruce were studied in laboratory
experiments. The volumetric water content of the soil, Θ, was used
as the reference quantity to parameterize the dependency of MT emissions on soil
moisture and to characterize the severity of the drought.
When Θ dropped from 0.4 m3 × m−3 to
~0.2 m3 × m−3 slight increases of de novo MT
emissions were observed but with further progressing drought the emissions
decreased to almost zero. In most cases the increases of MT emissions
observed under conditions of mild drought were explainable by increases of
leaf temperature due to lowered transpirational cooling. When Θ fell
below certain thresholds, MT emissions decreased simultaneously with Θ and the relationship between Θ and MT emissions was approximately
linear. The thresholds of Θ
(0.044–0.19 m3 × m−3) were determined, as well as other
parameters required to describe the soil moisture dependence of de novo MT
emissions for application in the Model of Emissions of Gases and Aerosols
from Nature, MEGAN.
A factorial approach was found appropriate to describe the impacts of Θ, temperature, and light. Temperature and Θ influenced the emissions
largely independently from each other, and, in a similar manner, light
intensity and Θ acted independently on de novo MT emissions. The use
of Θ as the reference quantity in a factorial approach was tenable in
predicting constitutive de novo MT emissions when Θ changed on a time
scale of days. Empirical parameterization with Θ as a reference was only unsuccessful when soil moisture changed rapidly |
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