Continuous VOC flux measurements on boreal forest floor

Aaltonen, Hermanni; Aalto, Juho; Kolari, Pasi; Pihlatie, Mari; Pumpanen, Jukka; Kulmala, Markku; Nikinmaa, Eero; Vesala, Timo; Bäck, Jaana

doi:10.1007/s11104-012-1553-4

Cited by 64 publications

(104 citation statements)

References 51 publications

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“…If the p value of a correlation was larger than 0.0027, the result was disregarded as statistically insignificant, and those values are not shown in the table. , photosynthetic spring recovery and increased activity of soil and forest floor (Aaltonen et al, 2011(Aaltonen et al, , 2013. Considerable differences in emission potentials between early and late summer have been reported also earlier (Tarvainen et al, 2005;Hakola et al, 2006).…”

Section: Monoterpenes Their Emission Potentials and Differences To Bmentioning

confidence: 83%

“…Monoterpenes are emitted by Scots pine , Birch (Hakola et al, 2001) and forest floor (Hellén et al, 2006;Aaltonen et al, 2011Aaltonen et al, , 2013 at the site. According to Taipale et al, 2011, Scots pine is the most important monoterpene source in summer but its fraction of the total emission in spring and autumn have remained unstudied.…”

Section: Monoterpenes Their Emission Potentials and Differences To Bmentioning

confidence: 99%

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Annual cycle of volatile organic compound exchange between a boreal pine forest and the atmosphere

et al. 2015

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Abstract. Long-term flux measurements of volatile organic compounds (VOC) over boreal forests are rare, although the forests are known to emit considerable amounts of VOCs into the atmosphere. Thus, we measured fluxes of several VOCs and oxygenated VOCs over a Scots-pine-dominated boreal forest semi-continuously between May 2010 and December 2013. The VOC profiles were obtained with a proton transfer reaction mass spectrometry, and the fluxes were calculated using vertical concentration profiles and the surface layer profile method connected to the Monin-Obukhov similarity theory. In total fluxes that differed significantly from zero on a monthly basis were observed for 13 out of 27 measured masses. Monoterpenes had the highest net emission in all seasons and statistically significant positive fluxes were detected from March until October. Other important compounds emitted were methanol, ethanol+formic acid, acetone and isoprene+methylbutenol. Oxygenated VOCs showed also deposition fluxes that were statistically different from zero. Isoprene+methylbutenol and monoterpene fluxes followed well the traditional isoprene algorithm and the hybrid algorithm, respectively. Emission potentials of monoterpenes were largest in late spring and autumn which was possibly driven by growth processes and decaying of soil litter, respectively. Conversely, largest emission potentials of isoprene+methylbutenol were found in July. Thus, we concluded that most of the emissions of m/z 69 at the site consisted of isoprene that originated from broadleaved trees.Methanol had deposition fluxes especially before sunrise. This can be connected to water films on surfaces. Based on this assumption, we were able to build an empirical algorithm for bi-directional methanol exchange that described both emission term and deposition term. Methanol emissions were highest in May and June and deposition level increased towards autumn, probably as a result of increasing relative humidity levels leading to predominance of deposition.

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Section: Monoterpenes Their Emission Potentials and Differences To Bmentioning

confidence: 83%

Section: Monoterpenes Their Emission Potentials and Differences To Bmentioning

confidence: 99%

Annual cycle of volatile organic compound exchange between a boreal pine forest and the atmosphere

et al. 2015

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“…Compared to the ecosystem-scale fluxes, the fluxes of BVOCs (e.g. methanol, acetaldehyde, acetone, and monoterpenes) from the forest floor were about 1 to 2 orders of magnitude lower (Aaltonen et al, 2013).…”

Section: Introductionmentioning

confidence: 86%

Boreal forest BVOC exchange: emissions versus in-canopy sinks

et al. 2017

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Abstract. A multilayer gas dry deposition model has been developed and implemented into a one-dimensional chemical transport model SOSAA (model to Simulate the concentrations of Organic vapours, Sulphuric Acid and Aerosols) to calculate the dry deposition velocities for all the gas species included in the chemistry scheme. The new model was used to analyse in-canopy sources and sinks, including gas emissions, chemical production and loss, dry deposition, and turbulent transport of 12 featured biogenic volatile organic compounds (BVOCs) or groups of BVOCs (e.g. monoterpenes, isoprene+2-methyl-3-buten-2-ol (MBO), sesquiterpenes, and oxidation products of mono-and sesquiterpenes) in July 2010 at the boreal forest site SMEAR II (Station for Measuring Ecosystem-Atmosphere Relations). According to the significance of modelled monthly-averaged individual source and sink terms inside the canopy, the selected BVOCs were classified into five categories:

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“…According to earlier studies, the boreal forest floor emits monoterpenes (Aaltonen et al, 2011, 5 µg m −2 h −1 , and Hellén et al, 2006, 0-373 µg m −2 h −1 ), isoprenes (Aaltonen et al, 2011, 0.050 µg m −2 h −1 , and Hellén et al, 2006, 0-1.9), and sesquiterpenes (Aaltonen et al, 2011, 0.045 µg m −2 h −1 and Hellén et al, 2006, 0-0.8 µg m −2 h −1 : β-caryophyllene). Soil and understorey monoterpene emissions in pine forest are rather variable in time, but at their maximum they can make up to 10-15 % of the ecosystem scale emissions (Aaltonen et al, 2013). Isoprenoids are a lipophilic group of volatile organic compounds (VOCs) emitted in trace amounts.…”

Section: Introductionmentioning

confidence: 99%

“…Forest floor was discovered to be a significant monoterpene source during spring and fall, when photosynthesis is low (Hellén et al, 2006;Aaltonen et al, 2011Aaltonen et al, , 2013. On the forest floor, understorey vegetation emits monoterpenes (Aaltonen et al, 2011;Faubert et al, 2012) and photosynthesized energy regulates isoprene syntheses (Ghirardo et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Contribution of understorey vegetation and soil processes to boreal forest isoprenoid exchange

et al. 2017

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Abstract. Boreal forest floor emits biogenic volatile organic compounds (BVOCs) from the understorey vegetation and the heterogeneous soil matrix, where the interactions of soil organisms and soil chemistry are complex. Earlier studies have focused on determining the net exchange of VOCs from the forest floor. This study goes one step further, with the aim of separately determining whether the photosynthesized carbon allocation to soil affects the isoprenoid production by different soil organisms, i.e., decomposers, mycorrhizal fungi, and roots. In each treatment, photosynthesized carbon allocation through roots for decomposers and mycorrhizal fungi was controlled by either preventing root ingrowth (50 µm mesh size) or the ingrowth of roots and fungi (1 µm mesh) into the soil volume, which is called the trenching approach. Isoprenoid fluxes were measured using dynamic (steady-state flow-through) chambers from the different treatments. This study aimed to analyze how important the understorey vegetation is as a VOC sink. Finally, a statistical model was constructed based on prevailing temperature, seasonality, trenching treatments, understory vegetation cover, above canopy photosynthetically active radiation (PAR), soil water content, and soil temperature to estimate isoprenoid fluxes. The final model included parameters with a statistically significant effect on the isoprenoid fluxes. The results show that the boreal forest floor emits monoterpenes, sesquiterpenes, and isoprene. Monoterpenes were the most common group of emitted isoprenoids, and the average flux from the non-trenched forest floor was 23 µg m −2 h −1 . The results also show that different biological factors, including litterfall, carbon availability, biological activity in the soil, and physico-chemical processes, such as volatilization and absorption to the surfaces, are important at various times of the year. This study also discovered that understorey vegetation is a strong sink of monoterpenes. The statistical model, based on prevailing temperature, seasonality, vegetation effect, and the interaction of these parameters, explained 43 % of the monoterpene fluxes, and 34-46 % of individual α-pinene, camphene, β-pinene, and 3 -carene fluxes.

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Continuous VOC flux measurements on boreal forest floor

Cited by 64 publications

References 51 publications

Annual cycle of volatile organic compound exchange between a boreal pine forest and the atmosphere

Annual cycle of volatile organic compound exchange between a boreal pine forest and the atmosphere

Boreal forest BVOC exchange: emissions versus in-canopy sinks

Contribution of understorey vegetation and soil processes to boreal forest isoprenoid exchange

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