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Crop water status from plant stable carbon isotope values: A test case for monsoonal climates

Citation

Jones, PJ and O'Connell, TC and Jones, MK and Singh, RN and Petrie, CA, Crop water status from plant stable carbon isotope values: A test case for monsoonal climates, The Holocene pp. 1-12. ISSN 0959-6836 (2021) [Refereed Article]


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Copyright Statement

The Author(s) 2021. This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (https://creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access page (https://us.sagepub.com/en-us/nam/open-access-at-sage).

DOI: doi:10.1177/0959683621994649

Abstract

Stable carbon isotope analysis is increasingly used in archaeology as an indicator of crop water status and/or water management regime. While the technique shows promise, robust modern baseline studies are required to inform and validate archaeological interpretations. Here, we test stable carbon isotope values as a crop water status proxy in a monsoonal climatic context for the first time. Specifically, we test the relationship between grain stable carbon isotope values (δ13Cgrain), water availability, irrigation and soil type in barley (Hordeum vulgare L. (Zohary and Hopf.)) in north-west India, with the aim of deriving a locally-appropriate model for isotopic interpretation. We test this relationship across a substantial rainfall gradient (2001000mm/year) and find a negative logarithmic relationship between climatic water availability and δ13C. However, there is significant noise in the relationship, and we report δ13Cgrain variation of over 3 amongst samples drawn from similar climatic contexts. Soil type, irrigation type and irrigation frequency have no clear modifying effects. We conclude that: (1) barley stable carbon isotope values can act as an archaeological water status proxy in monsoonal areas, but will be most sensitive in areas receiving <450mm rainfall per year; and (2) it is not possible to precisely infer water management regimes. On the basis of our results, we propose guidelines for archaeological barley stable carbon isotope interpretation in north-west India and analogous monsoonal climates.

Item Details

Item Type:Refereed Article
Keywords:archaeology, stable isotope analysis, water stress, Indus Civilisation
Research Division:History, Heritage and Archaeology
Research Group:Archaeology
Research Field:Archaeology of Asia, Africa and the Americas
Objective Division:Culture and Society
Objective Group:Understanding past societies
Objective Field:Understanding Asia's past
UTAS Author:Jones, PJ (Dr Penelope Jones)
ID Code:143006
Year Published:2021
Deposited By:Menzies Institute for Medical Research
Deposited On:2021-02-19
Last Modified:2021-05-27
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