Details
| Original language | English |
|---|---|
| Pages (from-to) | 614-623 |
| Number of pages | 10 |
| Journal | Geochimica et cosmochimica acta |
| Volume | 126 |
| Publication status | Published - 1 Feb 2014 |
Abstract
The oxygen isotopic composition of cellulose is a valuable proxy in paleoclimate research. However, its application to sedimentary archives is challenging due to extraction and purification of cellulose. Here we present compound-specific δ18O results of hemicellulose-derived sugar biomarkers determined using gas chromatography-pyrolysis-isotope ratio mass spectrometry, which is a method that overcomes the above-mentioned analytical challenges. The biomarkers were extracted from stem material of different plants (Eucalyptus globulus, Vicia faba and Brassica oleracea) grown in climate chamber experiments under different climatic conditions. The δ18O values of arabinose and xylose range from 31.4‰ to 45.9‰ and from 28.7‰ to 40.8‰, respectively, and correlate highly significantly with each other (R=0.91, p<0.001). Furthermore, δ18Ohemicellulose (mean of arabinose and xylose) correlate highly significantly with δ18Oleaf water (R=0.66, p<0.001) and significantly with modeled δ18Ocellulose (R=0.42, p<0.038), as well as with relative air humidity (R=-0.79, p<0.001) and temperature (R=-0.66, p<0.001). These findings confirm that the hemicellulose-derived sugar biomarkers, like cellulose, reflect the oxygen isotopic composition of plant source water altered by climatically controlled evapotranspirative 18O enrichment of leaf water. While relative air humidity controls most rigorously the evapotranspirative 18O enrichment, the direct temperature effect is less important. However, temperature can indirectly exert influence via plant physiological reactions, namely by influencing the transpiration rate which affects δ18Oleaf water due to the Péclet effect. In a companion paper (Tuthorn et al., this issue) we demonstrate the applicability of the hemicellulose-derived sugar biomarker δ18O method to soils and provide evidence from a climate transect study confirming that relative air humidity exerts the dominant control on evapotranspirative 18O enrichment of leaf water.Finally, we present a conceptual model for the interpretation of δ18Ohemicellulose records and propose that a combined δ18Ohemicellulose and δ2Hn-alkane biomarker approach is promising for disentangling δ18Oprecipitation variability from evapotranspirative 18O enrichment variability in future paleoclimate studies.
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Geochemistry and Petrology
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In: Geochimica et cosmochimica acta, Vol. 126, 01.02.2014, p. 614-623.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Oxygen isotope ratios (18O/16O) of hemicellulose-derived sugar biomarkers in plants, soils and sediments as paleoclimate proxy I
T2 - Insight from a climate chamber experiment
AU - Zech, Michael
AU - Mayr, Christoph
AU - Tuthorn, Mario
AU - Leiber-Sauheitl, Katharina
AU - Glaser, Bruno
N1 - Copyright: Copyright 2014 Elsevier B.V., All rights reserved.
PY - 2014/2/1
Y1 - 2014/2/1
N2 - The oxygen isotopic composition of cellulose is a valuable proxy in paleoclimate research. However, its application to sedimentary archives is challenging due to extraction and purification of cellulose. Here we present compound-specific δ18O results of hemicellulose-derived sugar biomarkers determined using gas chromatography-pyrolysis-isotope ratio mass spectrometry, which is a method that overcomes the above-mentioned analytical challenges. The biomarkers were extracted from stem material of different plants (Eucalyptus globulus, Vicia faba and Brassica oleracea) grown in climate chamber experiments under different climatic conditions. The δ18O values of arabinose and xylose range from 31.4‰ to 45.9‰ and from 28.7‰ to 40.8‰, respectively, and correlate highly significantly with each other (R=0.91, p<0.001). Furthermore, δ18Ohemicellulose (mean of arabinose and xylose) correlate highly significantly with δ18Oleaf water (R=0.66, p<0.001) and significantly with modeled δ18Ocellulose (R=0.42, p<0.038), as well as with relative air humidity (R=-0.79, p<0.001) and temperature (R=-0.66, p<0.001). These findings confirm that the hemicellulose-derived sugar biomarkers, like cellulose, reflect the oxygen isotopic composition of plant source water altered by climatically controlled evapotranspirative 18O enrichment of leaf water. While relative air humidity controls most rigorously the evapotranspirative 18O enrichment, the direct temperature effect is less important. However, temperature can indirectly exert influence via plant physiological reactions, namely by influencing the transpiration rate which affects δ18Oleaf water due to the Péclet effect. In a companion paper (Tuthorn et al., this issue) we demonstrate the applicability of the hemicellulose-derived sugar biomarker δ18O method to soils and provide evidence from a climate transect study confirming that relative air humidity exerts the dominant control on evapotranspirative 18O enrichment of leaf water.Finally, we present a conceptual model for the interpretation of δ18Ohemicellulose records and propose that a combined δ18Ohemicellulose and δ2Hn-alkane biomarker approach is promising for disentangling δ18Oprecipitation variability from evapotranspirative 18O enrichment variability in future paleoclimate studies.
AB - The oxygen isotopic composition of cellulose is a valuable proxy in paleoclimate research. However, its application to sedimentary archives is challenging due to extraction and purification of cellulose. Here we present compound-specific δ18O results of hemicellulose-derived sugar biomarkers determined using gas chromatography-pyrolysis-isotope ratio mass spectrometry, which is a method that overcomes the above-mentioned analytical challenges. The biomarkers were extracted from stem material of different plants (Eucalyptus globulus, Vicia faba and Brassica oleracea) grown in climate chamber experiments under different climatic conditions. The δ18O values of arabinose and xylose range from 31.4‰ to 45.9‰ and from 28.7‰ to 40.8‰, respectively, and correlate highly significantly with each other (R=0.91, p<0.001). Furthermore, δ18Ohemicellulose (mean of arabinose and xylose) correlate highly significantly with δ18Oleaf water (R=0.66, p<0.001) and significantly with modeled δ18Ocellulose (R=0.42, p<0.038), as well as with relative air humidity (R=-0.79, p<0.001) and temperature (R=-0.66, p<0.001). These findings confirm that the hemicellulose-derived sugar biomarkers, like cellulose, reflect the oxygen isotopic composition of plant source water altered by climatically controlled evapotranspirative 18O enrichment of leaf water. While relative air humidity controls most rigorously the evapotranspirative 18O enrichment, the direct temperature effect is less important. However, temperature can indirectly exert influence via plant physiological reactions, namely by influencing the transpiration rate which affects δ18Oleaf water due to the Péclet effect. In a companion paper (Tuthorn et al., this issue) we demonstrate the applicability of the hemicellulose-derived sugar biomarker δ18O method to soils and provide evidence from a climate transect study confirming that relative air humidity exerts the dominant control on evapotranspirative 18O enrichment of leaf water.Finally, we present a conceptual model for the interpretation of δ18Ohemicellulose records and propose that a combined δ18Ohemicellulose and δ2Hn-alkane biomarker approach is promising for disentangling δ18Oprecipitation variability from evapotranspirative 18O enrichment variability in future paleoclimate studies.
UR - http://www.scopus.com/inward/record.url?scp=84891906795&partnerID=8YFLogxK
U2 - 10.1016/j.gca.2013.10.048
DO - 10.1016/j.gca.2013.10.048
M3 - Article
AN - SCOPUS:84891906795
VL - 126
SP - 614
EP - 623
JO - Geochimica et cosmochimica acta
JF - Geochimica et cosmochimica acta
SN - 0016-7037
ER -