Plant and Soil

, Volume 391, Issue 1–2, pp 367–382 | Cite as

Carbon and nitrogen partitioning of wheat and field pea grown with two nitrogen levels under elevated CO2

Regular Article

Abstract

Background and Aims

Crop responses to elevated atmospheric CO2 are likely to be different in semi-arid cropping systems of Australia. This experiment aimed to investigate the interactive effects of atmospheric CO2 and nitrogen (N) fertiliser on carbon (C) and N partitioning in the soil-plant system of Wheat (Triticum aestivum L.) and field pea (Pisum sativum L.).

Methods

Plants were grown with 40 or 100 mg N kg−1 under ambient CO2 (390 ppm) or elevated CO2 (eCO2; 550 ppm) using free-air CO2 enrichment (SoilFACE). Repeated 13CO2 pulse labelling was used to quantify C transfer via plant to the soil. Destructive sampling was performed at grain filling and maturity.

Results

eCO2 increased shoot biomass of field pea (36 %) and wheat (55 %) but only increased root biomass of wheat (13.5 %) in the 25–50 cm soil layer. Total N content of both species was greater under eCO2, and for field pea it indicated enhanced biological N2 fixation. However, eCO2 increased the C:N ratio of wheat even at the high N level. Greater 13C in soil of wheat grown under eCO2 indicated a minor increase in soil C via rhizodeposition.

Conclusions

Increased biomass and C:N ratio of wheat could have implications for residue decomposition. eCO2 and low N tended to increase grain yield but the increase was highly variable and not significant. Additional N content of field pea under eCO2 exceeded the N that would be removed in wheat grain, albeit with lower than expected grain yield due to dry conditions.

Keywords

13C pulse-labelling Carbon and nitrogen cycling CO2 × N interaction High atmospheric CO2 Free-air CO2 enrichment (FACE) 15 N 

Supplementary material

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Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  1. 1.Department of Animal, Plant & Soil Sciences, Centre for AgriBioscienceLa Trobe UniversityMelbourneAustralia
  2. 2.Department of Economic Development, Jobs, Transport & ResourcesHorshamAustralia
  3. 3.Faculty of Veterinary and Agricultural ScienceThe University of MelbourneMelbourneAustralia

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