Interannual and Seasonal Dynamics of Volatile Organic Compound Fluxes From the Boreal Forest Floor

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http://hdl.handle.net/10138/299996

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Mäki , M , Aalto , J , Hellen , H , Pihlatie , M & Bäck , J 2019 , ' Interannual and Seasonal Dynamics of Volatile Organic Compound Fluxes From the Boreal Forest Floor ' , Frontiers in plant science , vol. 10 , 191 . https://doi.org/10.3389/fpls.2019.00191

Title: Interannual and Seasonal Dynamics of Volatile Organic Compound Fluxes From the Boreal Forest Floor
Author: Mäki, Mari; Aalto, Juho; Hellen, Heidi; Pihlatie, Mari; Bäck, Jaana
Contributor: University of Helsinki, Ecosystem processes (INAR Forest Sciences)
University of Helsinki, Ecosystem processes (INAR Forest Sciences)
University of Helsinki, Department of Agricultural Sciences
University of Helsinki, Department of Forest Sciences
Date: 2019-02-22
Language: eng
Number of pages: 14
Belongs to series: Frontiers in plant science
ISSN: 1664-462X
URI: http://hdl.handle.net/10138/299996
Abstract: In the northern hemisphere, boreal forests are a major source of biogenic volatile organic compounds (BVOCs), which drive atmospheric processes and lead to cloud formation and changes in the Earth's radiation budget. Although forest vegetation is known to be a significant source of BVOCs, the role of soil and the forest floor, and especially interannual variations in fluxes, remains largely unknown due to a lack of long-term measurements. Our aim was to determine the interannual, seasonal and diurnal dynamics of boreal forest floor volatile organic compound (VOC) fluxes and to estimate how much they contribute to ecosystem VOC fluxes. We present here an 8-year data set of forest floor VOC fluxes, measured with three automated chambers connected to the quadrupole proton transfer reaction mass spectrometer (quadrupole PTR-MS). The exceptionally long data set shows that forest floor fluxes were dominated by monoterpenes and methanol, with relatively comparable emission rates between the years. Weekly mean monoterpene fluxes from the forest floor were highest in spring and in autumn (maximum 59 and 86 mu g m(-2) h(-1), respectively), whereas the oxygenated VOC fluxes such as methanol had highest weekly mean fluxes in spring and summer (maximum 24 and 79 mu g m(-2) h(-1), respectively). Although the chamber locations differed from each other in emission rates, the inter-annual dynamics were very similar and systematic. Accounting for this chamber location dependent variability, temperature and relative humidity, a mixed effects linear model was able to explain 79-88% of monoterpene, methanol, acetone, and acetaldehyde fluxes from the boreal forest floor. The boreal forest floor was a significant contributor in the forest stand fluxes, but its importance varies between seasons, being most important in autumn. The forest floor emitted 2-93% of monoterpene fluxes in spring and autumn and 1-72% of methanol fluxes in spring and early summer. The forest floor covered only a few percent of the forest stand fluxes in summer.
Subject: biogenic volatile organic compound
flux
forest floor
temperature
seasonality
vegetation
decomposition
SCOTS PINE
MONOTERPENE EMISSIONS
ATMOSPHERIC OH
CLIMATE-CHANGE
VOC EMISSIONS
PTR-TOF
SOIL
EXCHANGE
MODEL
METHANOL
1172 Environmental sciences
4112 Forestry
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