Jin, J. and Tang, C. and Armstrong, R. and Butterly, C. and Sale, P. (2012) Elevated CO2 temporally enhances phosphorus immobilization in the rhizosphere of wheat and chickpea. Plant and Soil. pp. 1-14.
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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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Climate change . Elevated CO2 . Microbial biomass C . P fractions . Phosphatase . Rhizosphere acidification |
| Author Affiliation: | La Trobe University, Melbourne Campus,Chinese Academy of Sciences, Harbin, 150081, China, Department of Primary Industries, PMB 260, Horsham, VIC, 3401, Australia |
| Subjects: | Soil Science and Microbiology Plant Physiology and Biochemistry > Biochemistry |
| Divisions: | Chickpea |
| Depositing User: | Mr. SanatKumar Behera |
| Date Deposited: | 10 Nov 2012 10:19 |
| Last Modified: | 10 Nov 2012 10:19 |
| Official URL: | http://dx.doi.org/10.1007/s11104-012-1516-9 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/8732 |
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