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

Tang, Jing; Schurgers, Guy; Rinnan, Riikka

doi:10.1029/2018rg000634

Cited by 54 publications

(52 citation statements)

References 155 publications

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“…In our study, the total amount of VOCs released from the soil surface varied between 1 and 10 ng s −1 m −2 , with terpenes contributing more than half (monoterpenes, 52%; sesquiterpenes, 6%). An increasing body of literature is available on VOC fluxes from forest soils and, to a lesser extent, from agricultural soils (for an overview, see e.g., [52][53][54]). Monoterpene soil emissions were regularly recorded in ecosystems with terpene storing litter covering the ground.…”

Section: Belowground Emissionsmentioning

confidence: 99%

Insights into the Intraspecific Variability of the above and Belowground Emissions of Volatile Organic Compounds in Tomato

et al. 2021

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The in-vivo monitoring of volatile organic compound (VOC) emissions is a potential non-invasive tool in plant protection, especially in greenhouse cultivation. We studied VOC production from above and belowground organs of the eight parents of the Multi-Parent Advanced Generation Intercross population (MAGIC) tomato population, which exhibits a high genetic variability, in order to obtain more insight into the variability of constitutive VOC emissions from tomato plants under stress-free conditions. Foliage emissions were composed of terpenes, the majority of which were also stored in the leaves. Foliage emissions were very low, partly light-dependent, and differed significantly among genotypes, both in quantity and quality. Soil with roots emitted VOCs at similar, though more variable, rates than foliage. Soil emissions were characterized by terpenes, oxygenated alkanes, and alkenes and phenolic compounds, only a few of which were found in root extracts at low concentrations. Correlation analyses revealed that several VOCs emitted from foliage or soil are jointly regulated and that above and belowground sources are partially interconnected. With respect to VOC monitoring in tomato crops, our results underline that genetic variability, light-dependent de-novo synthesis, and belowground sources are factors to be considered for successful use in crop monitoring.

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Section: Belowground Emissionsmentioning

confidence: 99%

Insights into the Intraspecific Variability of the above and Belowground Emissions of Volatile Organic Compounds in Tomato

et al. 2021

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“…The higher the atmospheric concentration and the smaller the stagnant boundary layer above the soil, the more VOCs will be transported from the atmosphere to the soil. Sink processes are numerous, but may overall be divided into adsorption, dissolution, and degradation (see also Tang et al, 2019). VOCs may adsorb to the soil organic matter, as is generally the case for noncharged, organic molecules.…”

Section: Battle Of Processes In a Complex Environmentmentioning

confidence: 99%

Soil Uptake of Volatile Organic Compounds: Ubiquitous and Underestimated?

Rinnan

Albers

2020

JGR Biogeosciences

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Volatile organic compound (VOC) emissions from ecosystems to the atmosphere have been widely studied, and the importance of soil contributions to VOC fluxes has received increasing attention. We suggest that while soil VOC emissions may be important in some situations, soil uptake of VOCs by microbial degradation is likely an omnipresent process, as also recently suggested by Trowbridge et al. (2020, https://doi.org/10.1029/2019JG005479). To be able to model net VOC fluxes, we need to be able to estimate both soil release and uptake processes and their drivers.

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“…VOC deposition on ecosystems, plants and even uptake to the cuticles has been observed in the past (Niinemets et al, 2014;Karl et al, 2010;Park et al, 2013;Langford et al, 2010;Cappellin et al, 2017). Soils can act as an additional VOC sink (Tang et al, 2019;Pegoraro et al, 2005;Cleveland and Yavitt, 1997). Deposition might also partly explain the weaker vertical gradients in the wet season, when the overcast conditions led to weaker irradiation and therewith lower OH levels, while deposition continued or was even increased due to precipitation.…”

Section: Total Oh Reactivity Profiles and Diel Cyclesmentioning

confidence: 99%

Total OH reactivity over the Amazon rainforest: variability with temperature, wind, rain, altitude, time of day, season, and an overall budget closure

Pfannerstill¹,

Reijrink²,

Edtbauer³

et al. 2020

Preprint

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Abstract. The tropical forests are Earth’s largest source of biogenic volatile organic compounds (BVOCs) and thus also the largest atmospheric sink region for the hydroxyl radical (OH). However, the OH sink above tropical forests is poorly understood, as past studies revealed large unattributed fractions of total OH reactivity. We present the first total OH reactivity and VOC measurements made at the Amazon Tall Tower Observatory (ATTO) at 80, 150, and 320 m above ground level, covering two dry seasons, one wet and one transition season in 2018–2019. By considering a wide range of previously unaccounted for VOCs, which we identified by PTR-ToF-MS, the unattributed fraction was with an overall average of 19 % within the measurement uncertainty of ~ 35 %. In terms of seasonal average OH reactivity, isoprene accounted for 23–43 % of the total, oxygenated VOCs (OVOCs) for 22–40 %, while monoterpenes, sesquiterpenes, and green leaf volatiles combined were responsible for 9–14 %. These findings show that OVOCs were until now an underestimated contributor to the OH sink above the Amazon forest. By day, total OH reactivity decreased towards higher altitudes with strongest vertical gradients observed around noon during the dry season (−0.026 s−1 m−1), while the gradient was inverted at night. Seasonal differences in total OH reactivity were observed, with the lowest daytime average and standard deviation of 19.9 ± 6.2 s−1 during a wet–dry transition season with frequent precipitation, 23.7 ± 6.5 s−1 during the wet season, and the highest average OH reactivities during two dry season observation periods with 28.1 ± 7.9 s−1 and 29.1 ± 10.8 s−1, respectively. The effects of different environmental parameters on the OH sink were investigated, and quantified, where possible. Precipitation caused short-term spikes in total OH reactivity, which were followed by below-normal OH reactivity for several hours. Biomass burning increased total OH reactivity by 2.7 s−1 to 9.5 s−1. We present a temperature-dependent parameterization of OH reactivity that could be applied in future models of the OH sink to further reduce our knowledge gaps in tropical forest OH chemistry.

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

Cited by 54 publications

References 155 publications

Insights into the Intraspecific Variability of the above and Belowground Emissions of Volatile Organic Compounds in Tomato

Insights into the Intraspecific Variability of the above and Belowground Emissions of Volatile Organic Compounds in Tomato

Soil Uptake of Volatile Organic Compounds: Ubiquitous and Underestimated?

Total OH reactivity over the Amazon rainforest: variability with temperature, wind, rain, altitude, time of day, season, and an overall budget closure

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