SOA Formation Potential of Emissions from Soil and Leaf Litter

Faiola, Celia; Vanderschelden, G. S.; Wen, Miao; Elloy, Farah C.; Cobos, D. R.; Watts, Richard J.; Jobson, T.; VanReken, T. M.

doi:10.1021/es4040045

Cited by 41 publications

(36 citation statements)

References 64 publications

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“…Monoterpenes, as lipophilic and volatile compounds, can be absorbed on the lipophilic cuticle layer (Joensuu et al, 2016). Microbes living on plant surfaces can also modify VOC emissions by metabolizing plant-emitted VOCs (Farré-Armengol et al, 2016). The lowest isoprenoid fluxes were previously measured from soil with dense understorey vegetation cover (Aaltonen et al, 2013), which supports our conclusion.…”

Section: Effect Of Understorey Vegetation On Voc Fluxessupporting

confidence: 85%

“…Earlier studies have also suggested that litter and decomposers are important isoprenoid sources (Hayward et al, 2001;Asensio et al, 2007Asensio et al, , 2008Isidorov et al, 2010;Insam and Seewald, 2010;Aaltonen et al, 2013;Greenberg et al, 2012;Faiola et al, 2014). Monoterpenes can be produced simultaneously by MEP pathways in plastids and by MVK pathways in cytoplasm, and at least some fungi and bacteria are capable of activating the MEP pathway (Rohmer et al, 1993(Rohmer et al, , 1996Eisenreich et al, 1998;Walter et al, 2000;Banerjee and Sharkey, 2014).…”

Section: Seasonality and Carbon Source Impacts On Emission Rates And mentioning

confidence: 99%

“…Photosynthesized carbon allocated belowground was shown to contribute 54 % of soil respiration (Högberg et al, 2001), but 47 % of the carbon allocated to roots and mycorrhizal fungi can also be released to the soil microbial metabolism after root death (Fogel and Hunt, 1983). The main monoterpene sources are suggested to be degraded litter (Aaltonen et al, 2011;Faiola et al, 2014), while emitted VOCs strongly depend on litter type (Ramirez et al, 2010) and tree roots (Lin et al, 2007;Aaltonen et al, 2011Aaltonen et al, , 2013, especially damaged ones (Hayward et al, 2001). Forest management can affect the soil isoprenoid fluxes.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Effect Of Understorey Vegetation On Voc Fluxessupporting

confidence: 85%

Section: Seasonality and Carbon Source Impacts On Emission Rates And mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2017

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“…The potential impacts of soil BVOC emissions on atmospheric chemistry are even less well understood than emission magnitudes. Faiola et al () found that litter‐derived emissions can facilitate the formation of organic aerosols in spring and autumn in a temperate pine forest. Furthermore, the potential role of soil (including litter) BVOC emissions in decreasing reactive hydroxyl radical (OH) has been hypothesized based on atmospheric chemistry models and OH reactivity measurements.…”

Section: Introductionmentioning

confidence: 99%

Process Understanding of Soil BVOC Fluxes in Natural Ecosystems: A Review

Tang

Schurgers

Rinnan

2019

Reviews of Geophysics

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Biogenic volatile organic compounds (BVOCs) can be released from soils to the atmosphere through microbial decomposition of plant residues or soil organic carbon, root emission, evaporation of litter‐stored BVOCs, and other physical processes. Soils can also act as a sink of BVOCs through biotic and abiotic uptake. Currently, the source and sink capabilities of soils have not been explicitly accounted for in global BVOC estimates from the terrestrial biosphere. In this review, we summarize the current knowledge of soil BVOC processes and aim to propose a generic framework for modelling soil BVOCs based on current understanding and data availability. To achieve this target, we start by reviewing measured sources and sinks of soil BVOCs and summarize commonly reported compounds. Next, we strive to disentangle the drivers for the underlying biotic and abiotic processes. We have ranked the list of compounds, known to be emitted from soils, based on our current understanding of how each process controls emission and uptake. We then present a modelling framework to describe soil BVOC emissions. The proposed framework is an important step toward initializing modelling exercises related to soil BVOC fluxes. Finally, we also provide suggestions for measurements needed to separate individual processes, as well as explore long‐term and large‐scale patterns in soil BVOC fluxes.

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“…The clear vertical gradient indicates emission sources of α-pinene near the forest floor. In fact, emission of monoterpene from the soil surface including fallen needles/branches and roots has been suggested as an important source of α-pinene (e.g., Hayward et al, 2001;Lin et al, 2007;Aaltonen et al, 2011) and its oxidation products in aerosols (Faiola et al, 2014). The vertical gradient of α-pinene found in the present study suggests that α-pinene is emitted not only from L. kaempferi leaves but also from the forest floor, such as from litter and/or roots.…”

Section: α-Pinenementioning

confidence: 49%

Emissions of biogenic volatile organic compounds and subsequent formation of secondary organic aerosols in a <I>Larix kaempferi</I> forest

et al. 2015

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Abstract. We conducted simultaneous measurements of concentrations and above-canopy fluxes of isoprene and α-pinene, along with their oxidation products in aerosols in a Larix kaempferi (Japanese larch) forest in summer 2012. Vertical profiles of isoprene showed the maximum concentration near the forest floor with a peak around noon, whereas oxidation products of isoprene, i.e., methacrolein (MACR) and methyl vinyl ketone (MVK), showed higher concentrations near the canopy level of the forest. The vertical profile suggests large emissions of isoprene near the forest floor, likely due to Dryopteris crassirhizoma (a fern species), and the subsequent reaction within the canopy. The concentrations of α-pinene also showed highest values near the forest floor, with maximums in the early morning and late afternoon. The vertical profiles of α-pinene suggest its large emissions from soil and litter in addition to emissions from L. kaempferi leaves at the forest site. Isoprene and its oxidation products in aerosols exhibited similar diurnal variations within the forest canopy, providing evidence of secondary organic aerosol (SOA) formation via oxidation of isoprene most likely emitted from the forest floor. Although high abundance of α-pinene was observed in the morning, its oxidation products in aerosols showed peaks in daytime, due to a time lag between the emission and atmospheric reactions of α-pinene to form SOA. Positive matrix factorization (PMF) analysis indicated that anthropogenic influence is the most important factor contributing to the elevated concentrations of molecular oxidation products of isoprene-( > 64 %) and α-pinenederived SOA (> 57 %). The combination of the measured fluxes and vertical profiles of biogenic volatile organic compounds (BVOCs) suggests that the inflow of anthropogenic precursors/aerosols likely enhanced the formation of both isoprene SOA and α-pinene SOA within the forest canopy even when the BVOC flux was relatively low. This study highlights the importance of intra-canopy processes that promote biogenic SOA formation in the presence of significant inflow of oxidants together with anthropogenic aerosols and their precursors.

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SOA Formation Potential of Emissions from Soil and Leaf Litter

Cited by 41 publications

References 64 publications

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

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

Process Understanding of Soil BVOC Fluxes in Natural Ecosystems: A Review

Emissions of biogenic volatile organic compounds and subsequent formation of secondary organic aerosols in a <I>Larix kaempferi</I> forest

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SOA Formation Potential of Emissions from Soil and Leaf Litter

Cited by 41 publications

References 64 publications

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

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

Process Understanding of Soil BVOC Fluxes in Natural Ecosystems: A Review

Emissions of biogenic volatile organic compounds and subsequent formation of secondary organic aerosols in a &lt;I&gt;Larix kaempferi&lt;/I&gt; forest

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Emissions of biogenic volatile organic compounds and subsequent formation of secondary organic aerosols in a <I>Larix kaempferi</I> forest