caa a22 4500 606219145 CHVBK 20210128101116.0 cr unu---uuuuu 210128e20150601xx s 000 0 eng 10.1007/s11104-015-2441-5 doi (NATIONALLICENCE)springer-10.1007/s11104-015-2441-5 Carbon and nitrogen partitioning of wheat and field pea grown with two nitrogen levels under elevated CO2 [Elektronische Daten] [Clayton Butterly, Roger Armstrong, Deli Chen, Caixian Tang] 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 100mgNkg−1 under ambient CO2 (390ppm) or elevated CO2 (eCO2; 550ppm) 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 25-50cm 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. Springer International Publishing Switzerland, 2015 13C pulse-labelling nationallicence Carbon and nitrogen cycling nationallicence CO2 × N interaction nationallicence High atmospheric CO2 nationallicence Free-air CO2 enrichment (FACE) nationallicence 15 N nationallicence Butterly Clayton Department of Animal, Plant & Soil Sciences, Centre for AgriBioscience, La Trobe University, 3086, Melbourne, Vic, Australia aut Armstrong Roger Department of Animal, Plant & Soil Sciences, Centre for AgriBioscience, La Trobe University, 3086, Melbourne, Vic, Australia aut Chen Deli Faculty of Veterinary and Agricultural Science, The University of Melbourne, 3010, Melbourne, Vic, Australia aut Tang Caixian Department of Animal, Plant & Soil Sciences, Centre for AgriBioscience, La Trobe University, 3086, Melbourne, Vic, Australia aut Plant and Soil Springer International Publishing 391/1-2(2015-06-01), 367-382 0032-079X 391:1-2<367 2015 391 11104 https://doi.org/10.1007/s11104-015-2441-5 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s11104-015-2441-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Butterly Clayton Department of Animal, Plant & Soil Sciences, Centre for AgriBioscience, La Trobe University, 3086, Melbourne, Vic, Australia aut NATIONALLICENCE 700 1- Armstrong Roger Department of Animal, Plant & Soil Sciences, Centre for AgriBioscience, La Trobe University, 3086, Melbourne, Vic, Australia aut NATIONALLICENCE 700 1- Chen Deli Faculty of Veterinary and Agricultural Science, The University of Melbourne, 3010, Melbourne, Vic, Australia aut NATIONALLICENCE 700 1- Tang Caixian Department of Animal, Plant & Soil Sciences, Centre for AgriBioscience, La Trobe University, 3086, Melbourne, Vic, Australia aut NATIONALLICENCE 773 0- Plant and Soil Springer International Publishing 391/1-2(2015-06-01), 367-382 0032-079X 391:1-2<367 2015 391 11104