A review of rhizosphere carbon flow modelling

M E Toal, C Yeomans, K Killham, A A Meharg

Research output: Contribution to journalArticle

134 Citations (Scopus)

Abstract

Rhizosphere processes play a key role in nutrient cycling in terrestrial ecosystems. Plant rhizodeposits supply low-molecular weight carbon substrates to the soil microbial community, resulting in elevated levels of activity surrounding the root. Mechanistic compartmental models that aim to model carbon flux through the rhizosphere have been reviewed and areas of future research necessary to better calibrate model parameters have been identified. Incorporating the effect of variation in bacterial biomass physiology on carbon flux presents a considerable challenge to experimentalists and modellers alike due to the difficulties associated with differentiating dead from dormant cells. A number of molecular techniques that may help to distinguish between metabolic states of bacterial cells are presented. The calibration of growth, death and maintenance parameters in rhizosphere models is also discussed. A simple model of rhizosphere carbon flow has been constructed and a sensitivity analysis was carried out on the model to highlight which parameters were most influential when simulating carbon flux. It was observed that the parameters that most heavily influenced long-term carbon compartmentalisation in the rhizosphere were exudation rate and biomass yield. It was concluded that future efforts to simulate carbon flow in the rhizosphere should aim to increase ecological realism in model structure.

Original languageEnglish
Pages (from-to)263-281
Number of pages19
JournalCommunications in Soil Science and Plant Analysis
Volume222
Publication statusPublished - 2000

Keywords

  • carbon
  • mechanistic
  • model
  • rhizosphere
  • sensitivity analysis
  • SOIL MICROBIAL BIOMASS
  • FUNGAL GROWTH-RESPONSE
  • ZEA-MAYS-L
  • PSEUDOMONAS-FLUORESCENS
  • MATHEMATICAL-ANALYSIS
  • RESPIRATION CURVES
  • ORGANIC-CARBON
  • NITROGEN MINERALIZATION
  • POPULATION DYNAMICS
  • THEORETICAL-MODEL

Cite this

Toal, M. E., Yeomans, C., Killham, K., & Meharg, A. A. (2000). A review of rhizosphere carbon flow modelling. Communications in Soil Science and Plant Analysis, 222, 263-281.

A review of rhizosphere carbon flow modelling. / Toal, M E ; Yeomans, C ; Killham, K ; Meharg, A A .

In: Communications in Soil Science and Plant Analysis, Vol. 222, 2000, p. 263-281.

Research output: Contribution to journalArticle

Toal, ME, Yeomans, C, Killham, K & Meharg, AA 2000, 'A review of rhizosphere carbon flow modelling', Communications in Soil Science and Plant Analysis, vol. 222, pp. 263-281.
Toal ME, Yeomans C, Killham K, Meharg AA. A review of rhizosphere carbon flow modelling. Communications in Soil Science and Plant Analysis. 2000;222:263-281.
Toal, M E ; Yeomans, C ; Killham, K ; Meharg, A A . / A review of rhizosphere carbon flow modelling. In: Communications in Soil Science and Plant Analysis. 2000 ; Vol. 222. pp. 263-281.
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N2 - Rhizosphere processes play a key role in nutrient cycling in terrestrial ecosystems. Plant rhizodeposits supply low-molecular weight carbon substrates to the soil microbial community, resulting in elevated levels of activity surrounding the root. Mechanistic compartmental models that aim to model carbon flux through the rhizosphere have been reviewed and areas of future research necessary to better calibrate model parameters have been identified. Incorporating the effect of variation in bacterial biomass physiology on carbon flux presents a considerable challenge to experimentalists and modellers alike due to the difficulties associated with differentiating dead from dormant cells. A number of molecular techniques that may help to distinguish between metabolic states of bacterial cells are presented. The calibration of growth, death and maintenance parameters in rhizosphere models is also discussed. A simple model of rhizosphere carbon flow has been constructed and a sensitivity analysis was carried out on the model to highlight which parameters were most influential when simulating carbon flux. It was observed that the parameters that most heavily influenced long-term carbon compartmentalisation in the rhizosphere were exudation rate and biomass yield. It was concluded that future efforts to simulate carbon flow in the rhizosphere should aim to increase ecological realism in model structure.

AB - Rhizosphere processes play a key role in nutrient cycling in terrestrial ecosystems. Plant rhizodeposits supply low-molecular weight carbon substrates to the soil microbial community, resulting in elevated levels of activity surrounding the root. Mechanistic compartmental models that aim to model carbon flux through the rhizosphere have been reviewed and areas of future research necessary to better calibrate model parameters have been identified. Incorporating the effect of variation in bacterial biomass physiology on carbon flux presents a considerable challenge to experimentalists and modellers alike due to the difficulties associated with differentiating dead from dormant cells. A number of molecular techniques that may help to distinguish between metabolic states of bacterial cells are presented. The calibration of growth, death and maintenance parameters in rhizosphere models is also discussed. A simple model of rhizosphere carbon flow has been constructed and a sensitivity analysis was carried out on the model to highlight which parameters were most influential when simulating carbon flux. It was observed that the parameters that most heavily influenced long-term carbon compartmentalisation in the rhizosphere were exudation rate and biomass yield. It was concluded that future efforts to simulate carbon flow in the rhizosphere should aim to increase ecological realism in model structure.

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KW - FUNGAL GROWTH-RESPONSE

KW - ZEA-MAYS-L

KW - PSEUDOMONAS-FLUORESCENS

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KW - RESPIRATION CURVES

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