Methods to Assess High-Resolution Subsurface Gas Concentrations and Gas Fluxes in Wetland Ecosystems

Elberling, Bo; Kühl, Michael; Glud, Ronnie N.; Jørgensen, Christian Juncher; Askaer, Louise; Rickelt, Lars Fledelius; Joensen, Hanna; Larsen, Morten; Liengaard, Lars

doi:10.2136/sssabookser10.c49

Cited by 5 publications

(5 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To date only one optode study on the earthworm Lumbricus terrestris has been presented [213]. Here it was shown that earthworm mucus deposits along the burrow walls created large (cm 2 size) anoxic microniches that persisted for several days in the otherwise oxygenated soil (Fig.…”

Section: Macrofaunamentioning

confidence: 93%

“…Systematic errors caused by temperature changes can be corrected for by applying temperature compensation, either using independent temperature measurements [212,213] or by using an internal, luminescent temperature-sensitive reference [214]. For applications where large temperature inhomogeneities across the planar optode exist, temperature has to be mapped to perform temperature compensation.…”

Section: Interferencesmentioning

confidence: 99%

“…(j) Corresponding planar optode O 2 image showing highly localised O 2 depletion at the burrow wall, most likely caused by increased microbial activity and reduced solute transport in the mucus lining. Reprinted from Elberling et al [213] by Permission, ASA, CSSA, SSSA. (For better readability of the colours in this figure the reader is referred to the web version of this article.…”

Section: Fields Of Applicationmentioning

confidence: 99%

See 2 more Smart Citations

Two decades of chemical imaging of solutes in sediments and soils – a review

Santner

Larsen

Kreuzeder

et al. 2015

Analytica Chimica Acta

Self Cite

165

130

View full text Add to dashboard Cite

The increasing appreciation of the small-scale (sub-mm) heterogeneity of biogeochemical processes in sediments, wetlands and soils has led to the development of several methods for high-resolution two-dimensional imaging of solute distribution in porewaters. Over the past decades, localised sampling of solutes (diffusive equilibration in thin films, diffusive gradients in thin films) followed by planar luminescent sensors (planar optodes) have been used as analytical tools for studies on solute distribution and dynamics. These approaches have provided new conceptual and quantitative understanding of biogeochemical processes regulating the distribution of key elements and solutes including O2, CO2, pH, redox conditions as well as nutrient and contaminant ion species in structurally complex soils and sediments. Recently these methods have been applied in parallel or integrated as so-called sandwich sensors for multianalyte measurements. Here we review the capabilities and limitations of the chemical imaging methods that are currently at hand, using a number of case studies, and provide an outlook on potential future developments for two-dimensional solute imaging in soils and sediments.

show abstract

Section: Macrofaunamentioning

confidence: 93%

Section: Interferencesmentioning

confidence: 99%

Section: Fields Of Applicationmentioning

confidence: 99%

See 1 more Smart Citation

Two decades of chemical imaging of solutes in sediments and soils – a review

Santner

Larsen

Kreuzeder

et al. 2015

Analytica Chimica Acta

Self Cite

165

130

View full text Add to dashboard Cite

show abstract

“…C uptake increases under a longer growing season (Natali et al, 2012), warming, drying (e.g., Malhotra et al, 2020) and changing plant community structure (e.g., Norby et al, 2019). C release via microbial respiration can be impacted by soil moisture (Blanc-Betes et al, 2016;Natali et al, 2015;Elberling et al, 2013), temperature (Hicks-Pries et al, 2013) and active layer depth (O'Donnell et al, 2011), as well as shifts in the quantity and quality of available organic matter (Treat et al, 2014;Hough et al, in press). Primary producers initially fix C and supply that C to the subsurface where it can be reworked by subsurface microorganisms.…”

Section: Introductionmentioning

confidence: 99%

Plant organic matter inputs exert a strong control on soil organic matter decomposition in a thawing permafrost peatland

Wilson

Hough

Verbeke

et al. 2022

Science of The Total Environment

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Plant organic matter inputs exert a strong control on soil organic matter decomposition in a thawing permafrost peatland

Wilson

Hough

Verbeke

et al. 2021

Preprint

View full text Add to dashboard Cite

Peatlands are a climate critical carbon (C) reservoir that will likely become a C source under continued warming. A strong relationship between plant tissue chemistry and the soil organic matter (SOM) that fuels C gas emissions is inferred, but rarely examined at the molecular level. Here we compared Fourier transform infrared (FT-IR) spectroscopy measurements of solid phase functionalities in plants and SOM to ultra-high-resolution mass spectrometric analyses of plant and SOM water extracts across a palsa-bog-fen thaw and moisture gradient in an Arctic peatland. From these analyses we calculated the C oxidation state (NOSC), a measure which can be used to assess organic matter quality. Palsa plant extracts had the highest NOSC, indicating high quality, while extracts of Sphagnum, which dominated the bog, had the lowest NOSC. The percentage of plant compounds that are less bioavailable and accumulate in the peat, increases from palsa (25%) to fen (41%) to bog (47 %), reflecting the pattern of percent Sphagnum cover. The pattern of NOSC in the plant extracts was consistent with the high number of consumed compounds in the palsa and low number of consumed compounds in the bog. However, in the FT-IR analysis of the solid phase bog peat, carbohydrate content was high implying higher quality SOM. We explain this discrepancy as the result of low solubilization of bog SOM facilitated by the low pH in the bog which makes the solid phase carbohydrates less available to microbial decomposition. Plant-associated lignins and tannins declined in the unsaturated palsa peat indicating decomposition, but accumulated in the bog and fen peat where decomposition was presumably inhibited by the anaerobic conditions. A molecular-level comparison of the aboveground C sources and peat SOM demonstrates that climate-associated vegetation shifts in peatlands are important controls on the mechanisms underlying changing C gas emissions.

show abstract

Methods to Assess High-Resolution Subsurface Gas Concentrations and Gas Fluxes in Wetland Ecosystems

Cited by 5 publications

References 44 publications

Two decades of chemical imaging of solutes in sediments and soils – a review

Two decades of chemical imaging of solutes in sediments and soils – a review

Plant organic matter inputs exert a strong control on soil organic matter decomposition in a thawing permafrost peatland

Plant organic matter inputs exert a strong control on soil organic matter decomposition in a thawing permafrost peatland

Contact Info

Product

Resources

About