Elevated CO2 induced rhizosphere effects on the decomposition and N recovery from crop residues

CR Butterly; X Wang; RD Armstrong; D Chen; C Tang

Journal article

Elevated CO2 induced rhizosphere effects on the decomposition and N recovery from crop residues

CR Butterly, X Wang, RD Armstrong, D Chen, C Tang

Plant and Soil | Published : 2016

DOI: 10.1007/s11104-016-2911-4

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Abstract

Background & aims: Elevated atmospheric CO2 (eCO2) can affect soil-plant systems via stimulating plant growth, rhizosphere activity and the decomposition of added (crop residues) or existing (priming) soil organic carbon (C). Increases in C inputs via root exudation, rhizodeposition and root turnover are likely to alter the decomposition of crop residues but will ultimately depend on the N content of the residues and the soil. Methods: Two soil column experiments were conducted under ambient CO2 (aCO2, 390 ppm) and eCO2 (700 ppm) in a glasshouse using dual-labelled (13C/15N) residues of wheat (Triticum aestivum cv. Yitpi) and field pea (Pisum sativum L. cv. PBA Twilight). The effects of eCO2..

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University of Melbourne Researchers

Clayton Butterly Author

Xiaojuan Wang Author

Roger Armstrong Author

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Grants

Awarded by Australian Research Council

Funding Acknowledgements

This research was supported by an Australian Research Council Linkage Project (LP100200757), and was conducted at the CO<INF>2</INF> glasshouse facility of the Department of Economic Development, Jobs, Transport and Resources (DEDJTR), Victoria at Horsham. We thank Dr Shu Kee Lam for his useful comments on the manuscript, Kaien Ra for her excellent technical support, Leanne Lisle for performing the IRMS analyses and Nicholas Sitlington Hansen who worked on this project as part of his Honours project.