Exchange of carbonyl sulfide (COS) between the atmosphere and various soils in China

Liu, J.; Geng, Chao; Mu, Yujing; Zhang, Y.; Xu, Zeling; Wu, Hai Yan

doi:10.5194/bg-7-753-2010

Cited by 34 publications

(26 citation statements)

References 56 publications

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“…Even at 100 ppt, only five of the soils had positive net COS fluxes indicating that the COS compensation point was lower than 100 ppt for the majority of the soils. This is consistent with previous studies on oxic soils (Kesselmeier et al, 1999;Liu et al, 2010) but contradictory to the results of Lehman and Conrad (1996) who found much higher compensation points. This apparent contradiction might be explained by the fact that Lehman 25 and Conrad explored a much higher and wider range of COS concentrations (60-410 ppb) where different COS consumption processes might take place (e.g.…”

Section: Relative Importance Of Gross Cos Production To the Net Soil contrasting

confidence: 55%

“…Although this is the first study to demonstrate a significant relationship between soil N concentration and gross COS 5 production rates, previous studies have observed shifts in the magnitude of net COS and CS2 fluxes upon fertilisation with nitrate in both deciduous and evergreen coniferous forests (Melillo & Steudler, 1989). In addition a number of studies on agricultural soils in the US and China have observed large temperature-sensitive emissions of COS Liu et al, 2010;Maseyk et al, 2014;Whelan & Rhew, 2015). Currently, the mechanisms for the observed link between sulphur and nitrogen cycling in soils is still not understood.…”

Section: Drivers and Mechanisms Of Cos Production Across European Soimentioning

confidence: 98%

“…5 Dramatic COS production rates have been observed across US and Chinese arable soils Liu et al, 2010;Maseyk et al, 2014;Whelan and Rhew, 2015). However, the exact mechanisms underlying COS production are still under debate .…”

Section: Drivers and Mechanisms Of Cos Production Across European Soimentioning

confidence: 99%

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Disentangling the rates of carbonyl sulphide (COS) production and consumption and their dependency with soil properties across biomes and land use types

Kaisermann¹,

Ogée²,

Sauze³

et al. 2018

Preprint

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Abstract. Soils both emit and consume the trace gas carbonyl sulphide (COS) leading to a soil-air COS exchange rate that is the net result of two opposing fluxes. Partitioning these two gross fluxes and understanding their drivers are necessary to 10 estimate the contribution of soils to the current and future atmospheric budget of COS.Previous efforts to disentangle the gross COS fluxes from soils have used flux measurements on air-dried soils as a proxy for the COS emission rates of moist soils. However, this method implicitly assumes that COS uptake becomes negligible and COS emission remains steady while soils are drying. We tested this assumption by estimating simultaneously the soil COS sources and sinks and their temperature sensitivity (Q10) from soil-air COS flux measurements on fresh soils at different COS 15 concentrations and two soil temperatures. Measurements were performed on 27 European soils from different biomes and land use types in order to obtain a large range of physical-chemical properties and identify the drivers of COS consumption and production rates.We found that COS production rates from moist and air-dried soils were not significantly different for a given soil and that the COS production rates had Q10 values (3.96 ± 3.94) that were larger and more variable than the Q10 for COS consumption 20(1.17 ± 0.27). COS production generally contributed less to the net flux that was dominated by gross COS consumption but this contribution of COS production increased rapidly at higher temperature, lower soil moisture and lower COS concentrations. Consequently, measurements at higher COS concentrations (viz. 1000 ppt) always increased the robustness of COS consumption estimates. Across the range of biomes and land use types, COS production rates co-varied with total soil nitrogen (r = 0.68, P < 0.05) and the first-order COS uptake rate co-varied most with microbial N content (r = 0.64, P < 0.05) 25providing new insights on how to upscale the contribution of soils to the global COS atmospheric budget.Atmos. Chem. Phys. Discuss., https://doi

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Section: Relative Importance Of Gross Cos Production To the Net Soil contrasting

confidence: 55%

Section: Drivers and Mechanisms Of Cos Production Across European Soimentioning

confidence: 98%

See 1 more Smart Citation

Disentangling the rates of carbonyl sulphide (COS) production and consumption and their dependency with soil properties across biomes and land use types

Kaisermann¹,

Ogée²,

Sauze³

et al. 2018

Preprint

View full text Add to dashboard Cite

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“…Several field studies provide support for this by showing that soils generally act as an OCS sink when measured at ambient concentrations (Castro and Galloway, 1991;Kuhn et al, 1999;J. Liu et al, 2010;Steinbacher et al, 2004;White et al, 2010;Yi et al, 2007) and that the uptake rate is reduced when the soil is autoclaved (Bremner and Banwart, 1976).…”

Section: J Ogée Et Al: a New Mechanistic Framework To Predict Ocs Fmentioning

confidence: 97%

“…In some extreme cases where P 25 fully dominates over f CA , our model could even predict OCS fluxes close to zero at temperatures below ∼ 10 • C that would increase exponentially at warmer temperatures, as it has been observed in some agricultural soils (J. Liu et al, 2010;Maseyk et al, 2014;Whelan and Rhew, 2015).…”

Section: Sensitivity To Soil Ca Activity and Ocs Emission Ratesmentioning

confidence: 99%

A new mechanistic framework to predict OCS fluxes from soils

Ogée¹,

et al. 2016

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Abstract.Estimates of photosynthetic and respiratory fluxes at large scales are needed to improve our predictions of the current and future global CO 2 cycle. Carbonyl sulfide (OCS) is the most abundant sulfur gas in the atmosphere and has been proposed as a new tracer of photosynthetic gross primary productivity (GPP), as the uptake of OCS from the atmosphere is dominated by the activity of carbonic anhydrase (CA), an enzyme abundant in leaves that also catalyses CO 2 hydration during photosynthesis. However soils also exchange OCS with the atmosphere, which complicates the retrieval of GPP from atmospheric budgets. Indeed soils can take up large amounts of OCS from the atmosphere as soil microorganisms also contain CA, and OCS emissions from soils have been reported in agricultural fields or anoxic soils. To date no mechanistic framework exists to describe this exchange of OCS between soils and the atmosphere, but empirical results, once upscaled to the global scale, indicate that OCS consumption by soils dominates OCS emission and its contribution to the atmospheric budget is large, at about one third of the OCS uptake by vegetation, also with a large uncertainty. Here, we propose a new mechanistic model of the exchange of OCS between soils and the atmosphere that builds on our knowledge of soil CA activity from CO 2 oxygen isotopes. In this model the OCS soil budget is described by a first-order reaction-diffusion-production equation, assuming that the hydrolysis of OCS by CA is total and irreversible. Using this model we are able to explain the observed presence of an optimum temperature for soil OCS uptake and show how this optimum can shift to cooler temperatures in the presence of soil OCS emission. Our model can also explain the observed optimum with soil moisture content previously described in the literature as a result of diffusional constraints on OCS hydrolysis. These diffusional constraints are also responsible for the response of OCS uptake to soil weight and depth observed previously. In order to simulate the exact OCS uptake rates and patterns observed on several soils collected from a range of biomes, different CA activities had to be invoked in each soil type, coherent with expected physiological levels of CA in soil microbes and with CA activities derived from CO 2 isotope exchange measurements, given the differences in affinity of CA for both trace gases. Our model can be used to help upscale laboratory measurements to the plot or the region. Several suggestions are given for future experiments in order to test the model further and allow a better constraint on the large-scale OCS fluxes from both oxic and anoxic soils.

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Constraining surface carbon fluxes using in situ measurements of carbonyl sulfide and carbon dioxide

Berkelhammer

Asaf

Still

et al. 2014

Global Biogeochemical Cycles

104

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Understanding the processes that control the terrestrial exchange of carbon is critical for assessing atmospheric CO2 budgets. Carbonyl sulfide (COS) is taken up by vegetation during photosynthesis following a pathway that mirrors CO2 but has a small or nonexistent emission component, providing a possible tracer for gross primary production. Field measurements of COS and CO2 mixing ratios were made in forest, senescent grassland, and riparian ecosystems using a laser absorption spectrometer installed in a mobile trailer. Measurements of leaf fluxes with a branch‐bag gas‐exchange system were made across species from 10 genera of trees, and soil fluxes were measured with a flow‐through chamber. These data show (1) the existence of a narrow normalized daytime uptake ratio of COS to CO2 across vascular plant species of 1.7, providing critical information for the application of COS to estimate photosynthetic CO2 fluxes and (2) a temperature‐dependent normalized uptake ratio of COS to CO2 from soils. Significant nighttime uptake of COS was observed in broad‐leafed species and revealed active stomatal opening prior to sunrise. Continuous high‐resolution joint measurements of COS and CO2 concentrations in the boundary layer are used here alongside the flux measurements to partition the influence that leaf and soil fluxes and entrainment of air from above have on the surface carbon budget. The results provide a number of critical constraints on the processes that control surface COS exchange, which can be used to diagnose the robustness of global models that are beginning to use COS to constrain terrestrial carbon exchange.

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Exchange of carbonyl sulfide (COS) between the atmosphere and various soils in China

Cited by 34 publications

References 56 publications

Disentangling the rates of carbonyl sulphide (COS) production and consumption and their dependency with soil properties across biomes and land use types

Disentangling the rates of carbonyl sulphide (COS) production and consumption and their dependency with soil properties across biomes and land use types

A new mechanistic framework to predict OCS fluxes from soils

Constraining surface carbon fluxes using in situ measurements of carbonyl sulfide and carbon dioxide

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