17 research outputs found
Boreal forest floor greenhouse gas emissions across a Pleurozium schreberi-dominated, wildfire-disturbed chronosequence
The boreal forest is a globally critical biome for carbon cycling. Its forests are shaped by wildfire events that affect ecosystem properties and climate feedbacks including greenhouse gas (GHG) emissions. Improved understanding of boreal forest floor processes is needed to predict the impacts of anticipated increases in fire frequency, severity, and extent. In this study, we examined relationships between time since last wildfire (TSF), forest floor soil properties, and GHG emissions (CO2, CH4, N2O) along a Pleurozium schreberi-dominated chronosequence in mid- to late succession located in northern Sweden. Over three growing seasons in 2012–2014, GHG flux measurements were made in situ and samples were collected for laboratory analyses. We predicted that P. schreberi-covered forest floor GHG fluxes would be related to distinct trends in the soil properties and microbial community along the wildfire chronosequence. Although we found no overall effect of TSF on GHG emissions, there was evidence that soil C/N, one of the few properties to show a trend with time, was inversely linked to ecosystem respiration. We also found that local microclimatic conditions and site-dependent properties were better predictors of GHG fluxes than TSF. This shows that site-dependent co-variables (that is, forest floor climate and plant-soil properties) need to be considered as well as TSF to predict GHG emissions as wildfires become more frequent, extensive and severe
Regiospecific characterisation of the triacylglycerols in animal fats using high performance liquid chromatography-atmospheric pressure chemical ionisation mass spectrometry
Stable isotope pulse-chasing and compound-specific stable carbon isotope analysis of phospholipid fatty acids to assess methane oxidising bacterial populations in landfill cover soils
The use of <sup>13</sup>C labelling of bacterial lipids in the characterisation of ambient methane-oxidising bacteria in soils
A new method for identifying the origins of simple and complex hopanoids in sedimentary materials using stable isotope labelling with <sup>13</sup>CH<sub>4</sub> and compound specific stable isotope analyses
Investigation of the effect of ammonium sulfate on populations of ambient methane oxidising bacteria by <sup>13</sup>C-labellling and GC/C/IRMS analysis of phospholipid fatty acids
<sup>13</sup>C-Labelling of lipids to investigate microbial communities in the environment
Rare branched fatty acids characterize the lipid composition of the intra-aerobic methane oxidizer “candidatus methylomirabilis oxyfera”
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