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The variation of soil microbial respiration with depth in relation to soil carbon composition

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Abstract

The vertical variation in soil microbial respiratory activity and its relationship to organic carbon pools is critical for modeling soil C stock and predicting impacts of climate change, but is not well understood. Mineral soil samples, taken from four Scottish soils at different depths (0–8, 8–16, 16–24, 24–32 cm), were analyzed and incubated in the laboratory under constant temperature and environmental conditions. The vegetation type/plant species showed significant effects on the absolute concentration of C components and microbial activity, but the relative distribution of C and respiration rate with soil depth are similar across sites. Soil C pools and microbial respiratory activity declined rapidly with soil depth, with about 30% of total organic carbon (TOC) and dissolved organic carbon (DOC), and about half microbial carbon (C mic ) and respired CO2 observed in the top 8 cm. The ratio of CO2:TOC generally decreased with soil depth, but CO2:DOC was significantly higher in the top 8 cm of soil than in the subsoil (8–32 cm). No general pattern between qCO2 (CO2:C mic ) and soil depth was found. The vertical distributions of soil C pools and microbial respiratory activity were best fitted with a single exponential equation. Compared with TOC and DOC, C mic appears to be an adequate predictor for the variation in microbial respiration rate with soil depth, with 95% of variation in normalized respiration rate accounted for by a linear relationship.

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Authors and Affiliations

  1. School of Biological Sciences, University of Aberdeen, Aberdeen, AB24 3NB, UK

    Changming Fang

  2. Ecology and Resource Management, School of GeoSciences, University of Edinburgh, Edinburgh, EH9 3JU, UK

    John B. Moncrieff

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  1. Changming Fang
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  2. John B. Moncrieff
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Fang, C., Moncrieff, J.B. The variation of soil microbial respiration with depth in relation to soil carbon composition. Plant Soil 268, 243–253 (2005). https://doi.org/10.1007/s11104-004-0278-4

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  • DOI: https://doi.org/10.1007/s11104-004-0278-4

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