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Limitations of soil microbial biomass carbon as an indicator of soil pollution in the field

Broos, K. and Macdonald, L.M. and Warne, M.S.J. and Heemsbergen, D.A. and Barnes, M.B. and Bell, M. and McLaughlin, M.J. (2007) Limitations of soil microbial biomass carbon as an indicator of soil pollution in the field. Soil Biology and Biochemistry, 39 (10). pp. 2693-2695.

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Article Link(s): http://dx.doi.org/10.1016/j.soilbio.2007.05.014

Publisher URL: http://www.sciencedirect.com/

Abstract

The size of the soil microbial biomass carbon (SMBC) has been proposed as a sensitive indicator for measuring the adverse effects of contaminants on the soil microbial community. In this study of Australian agricultural systems, we demonstrated that field variability of SMBC measured using the fumigation-extraction procedure limited its use as a robust ecotoxicological endpoint. The SMBC varied up to 4-fold across control samples collected from a single field site, due to small-scale spatial heterogeneity in the soil physicochemical environment. Power analysis revealed that large numbers of replicates (3-93) were required to identify 20% or 50% decreases in the size of the SMBC of contaminated soil samples relative to their uncontaminated control samples at the 0.05% level of statistical significance. We question the value of the routine measurement of SMBC as an ecotoxicological endpoint at the field scale, and suggest more robust and predictive microbiological indicators.

Item Type:Article
Corporate Creators:Department of Employment, Economic Development and Innovation (DEEDI), Agri-Science, Crop and Food Science, Plant Science
Business groups:Agri-Science, Crop and Food Science
Additional Information:© Crown copyright; © Published by Elsevier Ltd.
Keywords:Ecotoxicological endpoint; field variability; metal toxicity; robustness; soil microbial biomass carbon.
Subjects:Agriculture > Agriculture (General) > Soils. Soil science
Deposited On:03 Feb 2009 03:42
Last Modified:27 Oct 2011 01:53

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