Articles | Volume 17, issue 11
https://doi.org/10.5194/bg-17-2971-2020
https://doi.org/10.5194/bg-17-2971-2020
Research article
 | 
11 Jun 2020
Research article |  | 11 Jun 2020

The soil organic carbon stabilization potential of old and new wheat cultivars: a 13CO2-labeling study

Marijn Van de Broek, Shiva Ghiasi, Charlotte Decock, Andreas Hund, Samuel Abiven, Cordula Friedli, Roland A. Werner, and Johan Six

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Cited articles

Aziz, M. M., Palta, J. A., Siddique, K. H. M., and Sadras, V. O.: Five decades of selection for yield reduced root length density and increased nitrogen uptake per unit root length in Australian wheat varieties, Plant Soil, 413, 181–192, https://doi.org/10.1007/s11104-016-3059-y, 2017. 
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Brancourt-Hulmel, M., Doussinault, G., Lecomte, C., Bérard, P., Le Buanec, B., and Trottet, M.: Genetic improvement of agronomic traits of winter wheat cultivars released in France from 1946 to 1992, Crop Sci., 43, 37–45, 2003. 
Bromand, S., Whalen, J. K., Janzen, H. H., Schjoerring, J. K., and Ellert, B. H.: A pulse-labelling method to generate 13C-enriched plant materials, Plant Soil, 235, 253–257, https://doi.org/10.1023/A:1011922103323, 2001. 
Brooks, P. D., Geilmann, H., Werner, R. A., and Brand, W. A.: Improved precision of coupled δ13C and δ15N measurements from single samples using an elemental analyzer/isotope ratio mass spectrometer combination with a post-column six-port valve and selective CO2 trapping; improved halide robustness of the combustion, Rapid Commun. Mass Sp., 17, 1924–1926, https://doi.org/10.1002/rcm.1134, 2003. 
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Short summary
Four wheat cultivars were labeled with 13CO2 to quantify the effect of rooting depth and root biomass on the belowground transfer of organic carbon. We found no clear relation between the time since cultivar development and the amount of carbon inputs to the soil. Therefore, the hypothesis that wheat cultivars with a larger root biomass and deeper roots promote carbon stabilization was rejected. The amount of root biomass that will be stabilized in the soil on the long term is, however, unknown.
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