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Elevated CO temporally enhances phosphorus immobilization in the rhizosphere of wheat and chickpea.
- Source :
- Plant & Soil; Jul2013, Vol. 368 Issue 1/2, p315-328, 14p, 3 Charts, 5 Graphs
- Publication Year :
- 2013
-
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), under elevated atmosphere CO (eCO). 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 eCO (700 ppm) for 6 weeks. Results: The NaHCO-extractable inorganic P (Pi) in the rhizosphere was depleted by both wheat and chickpea in all soils, but was not significantly affected by CO treatment. However, NaHCO-extractable organic P (Po) accumulated, especially under eCO in soils with high P status. The NaOH-extractable Po under eCO accumulated only in the Vertosol with high P status. Crop species did not exhibit different eCO-triggered capabilities to access any P pool in either soil, though wheat depleted NaHCO-Pi and NaOH-Pi in the rhizosphere more than chickpea. Elevated CO 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 CO 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. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 0032079X
- Volume :
- 368
- Issue :
- 1/2
- Database :
- Complementary Index
- Journal :
- Plant & Soil
- Publication Type :
- Academic Journal
- Accession number :
- 88228091
- Full Text :
- https://doi.org/10.1007/s11104-012-1516-9