title: CO₂ and O₂ respiration kinetics in hydrocarbon contaminated soils amended with organic carbon sources used to determine catabolic diversity.
abstract: Multiple substrate induced respiration (MSIR) assays which assess the response of soils to carbon source amendment are effective approaches to determine catabolic diversity of soils. Many assays are based on a single short term (<6 h) time point measurement and usually limited to CO2 production only. However, repeated measurements of both CO2 and O2 simultaneously can provide additional valuable information. In this study, a MSIR assay involving eight carbon sources was applied to three hydrocarbon contaminated soils using continuous CO2 and O2 respiration measurements. Based on cumulative CO2 and O2 measurements at 4, 24 and 120 h, the soils were found to be distinct in terms of their catabolic diversity. Most noteworthy, however, was the response to the addition of maleic acid which provided strong evidence of abiotic CO2 efflux to be the overriding process, raising questions about the interpretation of CO2 only responses from organic acid addition in MSIR assays.
authors: The Food and Environment Research Agency, Sand Hutton, York YO41 1LZ, UK.
authors: Stéphane
authors: S
authors: Pietravalle
authors: Thomas J
authors: TJ
authors: Aspray
mesh_terms: D044822:Biodiversity; D002244:Carbon / Q000032:analysis; D057486:Carbon Cycle; D002245:Carbon Dioxide / Q000032:analysis* / Q000378:metabolism; D052918:Environmental Restoration and Remediation; D006838:Hydrocarbons / Q000032:analysis*; D007700:Kinetics; D008298:Maleates / Q000737:chemistry; D008660:Metabolism; D059013:Microbial Consortia; D010100:Oxygen / Q000032:analysis* / Q000378:metabolism; D012987:Soil / Q000737:chemistry; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000032:analysis* / Q000378:metabolism
chemical_list: D006838:Hydrocarbons; D008298:Maleates; D012987:Soil; D012989:Soil Pollutants; D002245:Carbon Dioxide; D002244:Carbon; C030272:maleic acid; D010100:Oxygen