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Published on: October 22, 2018

Rhizosphere priming: a nutrient perspective.

Feike A Dijkstra1, Yolima Carrillo, Elise Pendall

  • 1Department of Environmental Sciences, Centre for Carbon, Water, and Food, The University of Sydney Camden, NSW, Australia.

Frontiers in Microbiology
|August 3, 2013
PubMed
Summary
This summary is machine-generated.

Rhizosphere priming, driven by root activity, influences soil carbon dynamics. Elevated CO2 may enhance nitrogen release from soil organic matter in nitrogen-limited soils, but not in phosphorus-limited ones.

Keywords:
15N tracerN:P stoichiometrymicrobial miningnutrient competitionpreferential substrate utilizationprogressive nitrogen limitationroot exudates

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Area of Science:

  • Soil Science
  • Plant Ecology
  • Biogeochemistry

Background:

  • Rhizosphere priming describes the alteration of soil organic matter (SOM) decomposition due to plant root activity.
  • This process significantly impacts soil carbon (C) cycling and ecosystem responses to global climate change.
  • Interactions between rhizosphere priming, nutrient availability, and plant nutrient supply are critical for understanding plant responses to rising atmospheric CO2.

Purpose of the Study:

  • To investigate the effects of elevated CO2 on rhizosphere priming and its interactions with soil nutrient availability in semiarid grasslands.
  • To determine how rhizosphere priming influences nitrogen (N) and phosphorus (P) cycling under elevated CO2 conditions.

Main Methods:

  • Conducted two field studies in similar semiarid grassland ecosystems.
  • Applied elevated CO2 concentrations to assess impacts on rhizosphere priming and SOM decomposition.
  • Analyzed changes in nitrogen and phosphorus release associated with root activity and SOM decomposition.

Main Results:

  • Elevated CO2 led to increased rhizosphere priming, enhancing nitrogen release from SOM in one study but not the other.
  • The effect of rhizosphere priming on SOM decomposition varied, suggesting a role for nutrient limitations.
  • Evidence suggests rhizosphere priming may enhance N supply in N-limited systems, but not in P-limited systems.

Conclusions:

  • Rhizosphere priming's role in carbon sequestration under elevated CO2 is likely greater in nitrogen-poor soils compared to phosphorus-poor soils.
  • In P-limited soils, rhizodeposition may prioritize phosphorus mobilization over SOM decomposition.
  • Understanding nutrient limitations is crucial for predicting soil C dynamics and plant responses to climate change.