Off-season biogenic volatile organic compound emissions from heath mesocosms: responses to vegetation cutting

Rinnan, Riikka; Gierth, Diana; Bilde, Merete; Rosenørn, Thomas; Michelsen, Anders

doi:10.3389/fmicb.2013.00224

Cited by 31 publications

(28 citation statements)

References 55 publications

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“…The soil concentrations were mostly decoupled from forest floor VOC fluxes, which indicates that belowground sources are different from those that release VOCs from the soil surface. Most of the measured fluxes at the forest floor level probably originated from understorey vegetation and the decomposing O-horizon, humus (Hewitt and Street 1992;Aaltonen et al 2011;Faubert et al 2012;Rinnan et al 2014). Total monoterpene flux rates (21-62 μg m −2 h −1 ) from the boreal forest floor were the same order of magnitude than from the same forest site in 2015 (23 μg m −2 h −1 , Mäki et al 2017).…”

Section: Voc Concentrations Reflect the Biological And Physico-chemicmentioning

confidence: 91%

Boreal forest soil is a significant and diverse source of volatile organic compounds

et al. 2019

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Aims Vegetation emissions of volatile organic compounds (VOCs) are intensively studied worldwide , because oxidation products of VOCs contribute to atmospheric processes. The overall aim of this study was to identify and quantify the VOCs that originate from boreal podzolized forest soil at different depths, in addition to studying the association of VOC concentrations with VOC and CO 2 fluxes from the boreal forest floor. Methods This is the first published study that measures belowground VOC concentrations at different depths in a podzol soil combined with simultaneous flux measurements from the boreal forest floor. The VOC concentrations were determined by sampling VOCs from air inside soil layers using the gas collectors and adsorbent tubes. Forest floor VOC fluxes were determined using a dynamic enclosure technique. All the VOC samples were analysed using a thermal desorption-gas chromatograph-mass spectrometer. Results More than 50 VOCs, dominated by monoterpenes and sesquiterpenes, were detected in the air space in the soil during two measurement campaigns. The Ohorizon was a significant monoterpene source, because it contained fresh isoprenoid-rich litter. Belowground monoterpene concentrations were largely decoupled from forest floor monoterpene fluxes; thus, it seems that production processes and storages of VOCs partly differ from those VOCs that are simultaneously released from the forest floor. Both fluxes and concentrations of the monoterpenes and sesquiterpenes correlated with the CO 2 fluxes in autumn, indicating that VOC release was driven by microbial activity. Conclusions This is the first study where below-ground VOC concentrations were quantified in situ, and for this reason, this study provides valuable insights to the VOC sources present in soils.

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Section: Voc Concentrations Reflect the Biological And Physico-chemicmentioning

confidence: 91%

Boreal forest soil is a significant and diverse source of volatile organic compounds

et al. 2019

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“…5 Seasonal patterns in mean monoterpenoid fluxes (μg m −2 h −1 ) during 2017-2018 from a the boreal Scots pine and the Norway spruce stands at the SMEAR II station and b from the hemiboreal mixed and the Norway spruce stands at the SMEAR Estonia station. Error bars show standard deviation (n = 5 or 6) deciduous dwarf shrubs (Rinnan et al 2013: 4 μg m −2 h −1 ), high arctic Cassiope-heath (Lindwall et al 2015: 0.15 μg m −2 h −1 ), low arctic Betula-heath (Lindwall et al 2015: 7 μg m −2 h −1 ), and in low arctic Salix-heath (Lindwall et al 2015: 1 μg m −2 h −1 ). These studies show that sesquiterpene flux rates vary strongly depending on the prevailing vegetation type, which was also clear in our study.…”

Section: Climate and Stand Type Affects Forest Floor Voc Fluxesmentioning

confidence: 99%

Stand type affects fluxes of volatile organic compounds from the forest floor in hemiboreal and boreal climates

et al. 2019

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Aims The forest floor is a significant contributor to the stand-scale fluxes of biogenic volatile organic compounds. In this study, the effect of tree species (Scots pine vs. Norway spruce) on forest floor fluxes of volatile organic compounds (VOC) was compared in boreal and hemiboreal climates. Methods Monoterpenoid and sesquiterpene flux rates were determined during 2017-2018 using dynamic (steady-state flow-through) chambers placed on permanent soil collars on boreal and hemiboreal forest floors, where the canopy was formed by Scots pine (Pinus sylvestris), Norway spruce (Picea abies) or dominated by Scots pine with small coverage of Norway spruce and birches (Betula pendula and Betula pubescens). Results The total monoterpenoid fluxes were higher from the Scots pine forest floor (boreal 23 μg m −2 h −1 ) and from the mixed forest floor (hemiboreal 32 μg m −2 h −1 ) compared to the Norway spruce forest floor in both boreal (12 μg m −2 h −1 ) and hemiboreal (9 μg m −2 h −1 ) climates. Due to higher litterfall production, the forest floor seems to be a greater source of monoterpenoids and sesquiterpenes in the hemiboreal mixed stand dominated by Scots pine compared to the boreal Scots pine stand, although the difference was not statistically significant. Forest floor VOC fluxes followed a similar seasonal dynamic in different forest stands, with the highest flux rates in spring and summer. Significant VOC sources in the boreal forest floor were synthesis and release from vegetation and living roots together with litter decomposition of fungi and other microbes, where VOCs are released from needle storage pools. Ground vegetation in the hemiboreal forest is scanty under the dense tree canopy, meaning soil processes, such as litter decomposition, microbial metabolism and root release, were likely the dominating VOC sources. VOC fluxes from the hemiboreal forest floor were reduced by increases in soil moisture.Conclusions This study indicates that if the warming climate changes tree species' abundance and stand biomass, by increasing tree growth and coverage of broadleaf species, it may affect VOC fluxes from the forest floor and impact the total VOC emissions from northern soils.

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“…Temperate grassland species have been observed to emit isoprenoids (He et al, 2005), along with Mediterranean plant species (Owen et al, 2001), crop species, and tree species (Karl et al, 2009;Laothawornkitkul et al, 2009) such as Betula nana, Salix sp., Cassiope tetragona, and Populus tremula (Hakola et al, 1998;Rinnan et al, 2011). Hewitt and Street (1992) and Rinnan et al (2013) discovered that Deschampsia sp. does not emit isoprene or monoterpenes.…”

Section: Effect Of Understorey Vegetation On Voc Fluxesmentioning

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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Off-season biogenic volatile organic compound emissions from heath mesocosms: responses to vegetation cutting

Cited by 31 publications

References 55 publications

Boreal forest soil is a significant and diverse source of volatile organic compounds

Boreal forest soil is a significant and diverse source of volatile organic compounds

Stand type affects fluxes of volatile organic compounds from the forest floor in hemiboreal and boreal climates

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

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