NDLI: Trends in 13C/12C ratios and C isotope discrimination of wheat since 1845

Content Provider	Springer Nature Link
Author	Zhao, Fang Jie Spiro, Baruch McGrath, Steve P.
Copyright Year	2001
Abstract	Archived wheat grain and straw samples from the unfertilised plot of the Broadbalk Continuous Wheat Experiment at Rothamsted, England, were used to investigate the trends in stable C isotope ratios since 1845. Grain δ13C was higher than straw δ13C. Both grain and straw δ13C have decreased by approximately 2.5–2.8‰ over the last 153 years, and since the 1960s the decrease has been more rapid than the decrease of the δ13C of atmospheric CO2. The C isotope discrimination (Δ), and hence the ratio of CO2 concentration in leaf intercellular space to that in the ambient air (c i /c a), remained relatively stable or decreased slightly between 1845 and the mid-1960s, then increased considerably. The period with increasing Δ and c i /c a corresponds to the introduction of the modern short-straw cultivars of wheat. When grown on the unfertilised plot in the same seasons, a modern wheat cultivar had slightly higher Δ values than an old cultivar. The c i derived from both grain and straw Δ have increased by 33–37% over the last 153 years, with the increase being more rapid after than before the mid-1960s. However, there was no clear trend in the yields of straw and grain, primarily because of the limitations of N and other nutrients, and also because of large year-to-year variations.
Starting Page	336
Ending Page	342
Page Count	7
File Format	PDF
ISSN	00298549
Journal	Oecologia
Volume Number	128
Issue Number	3
e-ISSN	14321939
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2001-08-01
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Atmospheric CO2 Biomass Carbon isotope ratio Long-term trend Wheat Ecology Plant Sciences Hydrology/Water Resources
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics

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