A critical review of labelling techniques used to quantify rhizosphere carbon-flow

Andrew A. Meharg*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

109 Citations (Scopus)

Abstract

The rhizosphere is a major sink for photo-assimilated carbon and quantifying inputs into this sink is one of the main goals of rhizosphere biology as organic carbon lost from plant roots supports a higher microbial population in the rhizosphere compared to bulk soil. Two fundamentally different14CO2 labelling strategies have been developed to estimate carbon fluxes through the rhizosphere - continuous feeding of shoots with labelled carbon dioxide and pulse-chase experiments. The biological interpretation that can be placed on the results of labelling experiments is greatly biased by the technique used. It is the purpose of this paper to assess the advantages, disadvantages and the biological interpretation of both continuous and pulse labelling and to consider how to partition carbon fluxes within the rhizosphere.

Original languageEnglish
Pages (from-to)55-62
Number of pages8
JournalPlant and Soil
Volume166
Issue number1
DOIs
Publication statusPublished - Mar 1994

Keywords

  • carbon cycling
  • carbon-flow
  • continuous labelling
  • pulse labelling
  • rhizosphere
  • roots
  • soil microbial biomass

ASJC Scopus subject areas

  • Soil Science
  • Plant Science
  • Agronomy and Crop Science
  • Earth and Planetary Sciences(all)
  • Environmental Science(all)

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