Plant and Soil

, Volume 368, Issue 1–2, pp 315–328 | Cite as

Elevated CO2 temporally enhances phosphorus immobilization in the rhizosphere of wheat and chickpea

  • Jian Jin
  • Caixian Tang
  • Roger Armstrong
  • Clayton Butterly
  • Peter Sale
Regular Article

Abstract

Aims

The efficient management of phosphorus (P) in cropping systems remains a challenge due to climate change. We tested how plant species access P pools in soils of varying P status (Olsen-P 3.2–17.6 mg kg−1), under elevated atmosphere CO2 (eCO2).

Methods

Chickpea (Cicer arietinum L.) and wheat (Triticum aestivum L.) plants were grown in rhizo-boxes containing Vertosol or Calcarosol soil, with two contrasting P fertilizer histories for each soil, and exposed to ambient (380 ppm) or eCO2 (700 ppm) for 6 weeks.

Results

The NaHCO3-extractable inorganic P (Pi) in the rhizosphere was depleted by both wheat and chickpea in all soils, but was not significantly affected by CO2 treatment. However, NaHCO3-extractable organic P (Po) accumulated, especially under eCO2 in soils with high P status. The NaOH-extractable Po under eCO2 accumulated only in the Vertosol with high P status. Crop species did not exhibit different eCO2-triggered capabilities to access any P pool in either soil, though wheat depleted NaHCO3-Pi and NaOH-Pi in the rhizosphere more than chickpea. Elevated CO2 increased microbial biomass C in the rhizosphere by an average of 21 %. Moreover, the size in Po fractions correlated with microbial C but not with rhizosphere pH or phosphatase activity.

Conclusion

Elevated CO2 increased microbial biomass in the rhizosphere which in turn temporally immobilized P. This P immobilization was greater in soils with high than low P availability.

Keywords

Climate change Elevated CO2 Microbial biomass C P fractions Phosphatase Rhizosphere acidification 

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Copyright information

© Springer Science+Business Media Dordrecht 2012

Authors and Affiliations

  • Jian Jin
    • 1
    • 3
  • Caixian Tang
    • 1
  • Roger Armstrong
    • 2
  • Clayton Butterly
    • 1
  • Peter Sale
    • 1
  1. 1.Department of Agricultural SciencesLa Trobe UniversityBundooraAustralia
  2. 2.Department of Primary IndustriesHorshamAustralia
  3. 3.Key Laboratory of Black Soil Ecology, Northeast Institute of Geography and Agroecology, Chinese Academy of SciencesHarbinChina

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