Influence of soil moisture regime on the respiration response of soilssubjected to osmotic stress

Published

Journal Article

The influence of the soil moisture regime on the tolerance of the soil micro-organisms to increased osmotic stress was examined by laboratory tests with a range of New Zealandsoils. Soils from various climatic regions (moist, intermediate and dry) were amended withglucose-NaCl solutions, incubated for 0-5 h, and the respiration rate over the following2 h was used as a measure of the response of the microbial biomass to the changedosmotic potential. Osmotic potentials were varied between -4 and -80 bar by altering theconcentration of NaCl. Air-drying the soils at 25“C decreased the respiration response of the microbial biomass by 3-60% but had little effect on the tolerance of the surviving populations to decreasedosmotic potentials. In general, the soils showed the same patterns: an osmotic potential of-23 bar decreased the respiration response by 28-45% (18-44% after air-drying) and a -80bar potential decreased it by 64-86% (52-84% after air-drying). For the majority of soils, a consistent relationship was obtained between the respiration rate of the moist soils and the osmotic potential applied. A reasonable prediction of therespiration response after air-drying could be obtained from the respiration response ofmoist soils at -25 bar osmotic potential. © 1989, CSIRO. All rights reserved.

Full Text

Duke Authors

Cited Authors

  • Sparling, GP; West, AW; Reynolds, J

Published Date

  • January 1, 1989

Published In

Volume / Issue

  • 27 / 1

Start / End Page

  • 161 - 168

International Standard Serial Number (ISSN)

  • 0004-9573

Digital Object Identifier (DOI)

  • 10.1071/SR9890161

Citation Source

  • Scopus