What can crop stable isotopes ever do for us? An experimental perspective on using cereal carbon stable isotope values for reconstructing water availability in semi-arid and arid environments

Authors: Flohr, P., Muldner, G., Jenkins, E., Williams, H., Jamjoum, K. and Nuimat, S.

http://eprints.bournemouth.ac.uk/31527/

Journal: Vegetation History and Archaeobotany

Publisher: Springer Nature

ISSN: 0939-6314

This study re-assesses and refines the use of crop carbon stable isotopes (Δ13C) to reconstruct past water availability. Durum wheat, six-row barley, and sorghum were experimentally grown at three crop growing stations in Jordan for up to three years under five different irrigation regimes: 0% (rainfall only), 40%, 80%, 100%, and 120% of the crops’ optimum water requirements. Results show large variation in carbon stable isotopes for crops that received similar amounts of water, either as absolute water input or as percentage of crop requirements. We conclude that C3 crop carbon stable isotope composition can therefore be best interpreted in terms of extremely high values showing an abundance of water versus low values indicating water-stress. Values in between these extremes are problematic and best interpreted in conjunction with other proxies. C4 crop isotopes were not found to be useful for the reconstruction of water availability.

This data was imported from Scopus:

Authors: Flohr, P., Jenkins, E., Williams, H.R.S., Jamjoum, K., Nuimat, S. and Müldner, G.

http://eprints.bournemouth.ac.uk/31527/

Journal: Vegetation History and Archaeobotany

Volume: 28

Issue: 5

Pages: 497-512

ISSN: 0939-6314

DOI: 10.1007/s00334-018-0708-5

© 2019, The Author(s). This study re-assesses and refines the use of crop carbon stable isotope values (Δ13C) to reconstruct past water availability. Triticum turgidum ssp. durum (durum wheat), Hordeum vulgare (six-row barley) and Sorghum bicolor (sorghum) were experimentally grown at three crop research stations in Jordan for up to three years under five different irrigation regimes: 0% (rainfall only), 40%, 80%, 100% and 120% of the crops’ optimum water requirements. The results show a large variation in carbon stable isotope values of crops that received similar amounts of water, either as absolute water input or as percentage of crop requirements. We conclude that C3 crop carbon stable isotope composition should be assessed using a climate zone specific framework. In addition, we argue that interpretation should be done in terms of extremely high values showing an abundance of water versus low values indicating water stress, with values in between these extremes best interpreted in conjunction with other proxy evidence. Carbon stable isotope values of the C4 crop Sorghum were not found to be useful for the reconstruction of water availability.

This data was imported from Web of Science (Lite):

Authors: Flohr, P., Jenkins, E., Williams, H.R.S., Jamjoum, K., Nuimat, S. and Muldner, G.

http://eprints.bournemouth.ac.uk/31527/

Journal: VEGETATION HISTORY AND ARCHAEOBOTANY

Volume: 28

Issue: 5

Pages: 497-512

eISSN: 1617-6278

ISSN: 0939-6314

DOI: 10.1007/s00334-018-0708-5

The data on this page was last updated at 05:13 on February 22, 2020.