Publications by authors named "Henrik Reyier"

2 Publications

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Influence of Multiple Environmental Factors on Organic Matter Chlorination in Podsol Soil.

Environ Sci Technol 2017 Dec 12;51(24):14114-14123. Epub 2017 Dec 12.

Department of Thematic Studies, Environmental Change, Linköping University , SE-581 83 Linköping, Sweden.

Natural chlorination of organic matter is common in soils. The abundance of chlorinated organic compounds frequently exceeds chloride in surface soils, and the ability to chlorinate soil organic matter (SOM) appears widespread among microorganisms. Yet, the environmental control of chlorination is unclear. Laboratory incubations with Cl as a Cl tracer were performed to test how combinations of environmental factors, including levels of soil moisture, nitrate, chloride, and labile organic carbon, influenced chlorination of SOM from a boreal forest. Total chlorination was hampered by addition of nitrate or by nitrate in combination with water but enhanced by addition of chloride or most additions including labile organic matter (glucose and maltose). The greatest chlorination was observed after 15 days when nitrate and water were added together with labile organic matter. The effect that labile organic matter strongly stimulated the chlorination rates was confirmed by a second independent experiment showing higher stimulation at increased availability of labile organic matter. Our results highlight cause-effect links between chlorination and the studied environmental variables in podsol soil-with consistent stimulation by labile organic matter that did overrule the negative effects of nitrate.
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http://dx.doi.org/10.1021/acs.est.7b03196DOI Listing
December 2017

Automated flux chamber for investigating gas flux at water-air interfaces.

Environ Sci Technol 2013 Jan 26;47(2):968-75. Epub 2012 Dec 26.

Department of Geological Sciences, Stockholm University, 106 91 Stockholm, Sweden.

Aquatic ecosystems are major sources of greenhouse gases (GHG). Representative measurements of GHG fluxes from aquatic ecosystems to the atmosphere are vital for quantitative understanding of relationships between biogeochemistry and climate. Fluxes occur at high temporal variability at diel or longer scales, which are not captured by traditional short-term deployments (often in the order of 30 min) of floating flux chambers. High temporal frequency measurements are necessary but also extremely labor intensive if manual flux chamber based methods are used. Therefore, we designed an inexpensive and easily mobile automated flux chamber (AFC) for extended deployments. The AFC was designed to measure in situ accumulation of gas in the chamber and also to collect gas samples in an array of sample bottles for subsequent analysis in the laboratory, providing two independent ways of CH(4) concentration measurements. We here present the AFC design and function together with data from initial laboratory tests and from a field deployment.
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http://dx.doi.org/10.1021/es303848xDOI Listing
January 2013