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Loss of low molecular weight dissolved organic carbon (DOC) and nitrogen (DON) in H2O and 0.5 M K2SO4 soil extracts

Author:
  • Johannes Rousk
  • Davey L. Jones
Publishing year: 2010
Language: English
Pages: 2331-2335
Publication/Series: Soil Biology & Biochemistry
Volume: 42
Issue: 12
Document type: Journal article
Publisher: Elsevier

Abstract english

Soil extracts are routinely used to quantify dissolved organic nutrient concentrations in soil. Here we studied the loss and transformation of low molecular weight (LMW) components of DOC (C-14-glucose, 1 and 100 mu M) and DON (C-14-amino acid mixture, 1 and 100 mu M) during extraction of soil (0-6 h) with either distilled water or 0.5 M K2SO4. The extractions were performed at 20 degrees C, at 4 degrees C, or in the presence of an inhibitor of microbial activity (HgCl2 and Na-azide). We showed that both glucose and amino acids became progressively lost from solution with increasing shaking time. The greatest loss was observed in H2O extracts at 1 mu M for both substances (>90% loss after 15 min). Lower temperature (4 degrees C) and presence of K2SO4 both resulted in reduced loss rates. The presence of microbial inhibitors effectively eliminated the loss of glucose and amino acids. We conclude that microbial transformation of LMW-DOC and DON during H2O or K2SO4 extraction of soil may affect the estimation of their concentrations in soil. This finding has significant implications for methods that rely on chemical extractions to estimate LMW-C components of DOC and DON. (c) 2010 Elsevier Ltd. All rights reserved.

Keywords

  • Biological Sciences
  • Soil organic matter turnover
  • Mineralization
  • Microbial biomass
  • Method
  • Biodegradation
  • Decomposition
  • Glucose
  • Amino acids

Other

Published
  • Carbon drivers and microbial agents of soil respiration
  • Microbial carbon-use efficiency
  • Microbial Ecology
  • ISSN: 0038-0717
JR photo
E-mail: johannes [dot] rousk [at] biol [dot] lu [dot] se

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