Oxygen isotope ratios of cellulose-derived phenylglucosazone: An improved paleoclimate indicator of environmental water and relative humidity

Sternberg, Leonel da Silveira Lobo; Pinzon, M. C.; Vendramini, Patricia F.; Anderson, William T.; Jahren, A. Hope; Beuning, Kristina R. M.

doi:10.1016/j.gca.2007.03.004

Cited by 36 publications

(27 citation statements)

References 32 publications

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“…A refinement of isotope fractionation models that incorporate intra-molecular isotope variations could help in distinguishing between source water and leaf water influences, but also better explain dampening effects. Sternberg et al (2007) observed that the d 18 O content of the oxygen attached to the second carbon of the cellulose molecule may most closely reflect the d 18 O of the source water. In this study, a further curvilinear relationship between d 18 O of source water and cellulose was observed, which could result in the relative insensitivity of d 18 O to temperature above a certain threshold value and thus a dampening effect similar to what we observed, although this phenomenon is not fully understood.…”

Section: Discussionmentioning

confidence: 98%

Temperature versus species-specific influences on the stable oxygen isotope ratio of tree rings

Reynolds‐Henne

Saurer

Siegwolf

2009

Trees

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Stable isotopic ratios integrate ecosystem variability while reflecting change in both environmental and biological processes. At sites, where climate does not strongly limit tree growth, co-occurring trees may display large discrepancies in stable oxygen isotopic ratios (d 18 O) due to the interplay between biological processes (competition for light and nutrients, individual tree physiology, etc.) and climate. For a better quantification of the isotope variability within and among trees, the climatic and/or individual tree effects on seasonal d 18 O variations in precipitation, soil water, leaf water and leaf organic material (whole leaf, cellulose and starch) and annual d 18 O variations in tree-ring cellulose for Fagus sylvatica (Fs), Quercus robur (Qr), Carpinus betulus (Cb) and Pinus sylvestris (Ps) were studied in a mature temperate forest in Switzerland, using a mixed linear regression model technique. Furthermore, the influence of environmental factors on d 18 O was assessed by means of three common isotope fractionation models. Our statistical analysis showed that except for Ps, a greater portion of d 18 O variance in leaf compounds can be explained by individual tree effects, compared to temperature. Concerning tree-ring cellulose, only Fs and Ps show a significant temperature signal (maximum 12% of the variance explained), while the individual tree effect significantly explains d 18 O for all species for a period of 38 years. Large species differences resulted in a limited ability of the isotope fractionation models to predict measured values. Overall, we conclude that in a diverse mixed forest stand, individual tree responses reduce the potential extraction of a temperature signal from d 18 O.

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Section: Discussionmentioning

confidence: 98%

Temperature versus species-specific influences on the stable oxygen isotope ratio of tree rings

Reynolds‐Henne

Saurer

Siegwolf

2009

Trees

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“…TOC values were lower than in the rest of the record, whereas TN reached the highest values at this depth. According to Kuhry and Vitt (1996), Hornibrook et al (2000), Sternberg et al (2007) and Schellekens et al (2015a), among others, lower TOC values in the acrotelm refiects the loss of organic compounds during initial decay. In contrast, high values of N in the upper part of the core probably refiect the rapid recycling of this nutrient by plants in the aerobic layer (d. Heijmans et al, 2002;Schellekens et al, 2015b).…”

Section: Cjnmentioning

confidence: 95%

“…In fact, at present, Las Conchas mire is a meadow in which grass is very abundant, thus producing a predominance of C 31 alkane in the upper part of the record. Likewise, the decrease in TOC at the top ofthe record might be attributable to carbon loss linked to the oxidation of OM (Sternberg et al, 2007). However, abundant livestock that grazes on the mire may have also infiuenced this parameter, together with the increase in TN in this part of the record.…”

Section: N-alkanoíc Addsmentioning

confidence: 99%

Biomarkers and inorganic proxies in the paleoenvironmental reconstruction of mires: The importance of landscape in Las Conchas (Asturias, Northern Spain)

Ortíz

Borrego

Gallego

et al. 2016

Organic Geochemistry

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A B S T R A C TWe determined the lipid distributions (n-alkanes, n-alkan-2-ones, n-alkanoic acids), total organic carbon (TOC), total nitrogen (TN), CajMg and ash content in Las Conchas mire, a 3.2 m deep bryophytedominated mire in Northern Spain covering 8000 cal yr BP. Bog conditions developed in the bottom 20 cm of the profile, and good preservation of organic matter (OM) was inferred from n-alkanoic acid distribution, with the exception of the uppermost 20 cm (last ca. 200 yr). Microbial synthesis of long chain saturated fatty acids from primary OM likely produced a dominance of short chain n-alkanoic acids with a bimodal distribution, as well as the lack of correspondence between the n-alkane and n-alkanoic acid profiles in the upper 20 cm. This was accompanied by an increase in ash content, a decrease in TOC and variation in n-alkane ratio s, thereby suggesting significant changes in the mire, namely drainage and transformation to a meadow, in the last ca. 200 yr. The distribution of n-alkan-2-ones indicated an increase in bacterial source from the bottom of the record to 94 cm, whereas their distribution in the upper part could be attributed mainly to plant input andjor the microbial oxidation of n-alkanes. The different n-alkane proxies showed variations, which we interpreted in terms of changes in vegetation (Sphagnum vs. non-Sphagnum dominated phases) during the last 8000 cal yr BP. C 23 was the most abundant homolog throughout most ofthe record, thereby suggesting dominant humid conditions alternating with short drier phases. However, such humid conditions were not linked to paleoclimatic variation but rather to geomorphological characteristics: Las Conchas mire, at the base of the Cuera Range, receives continuous runoff-even during drier periods-which is not necessarily accompanied by additional mineral input to peat, producing the development of Sphagnum moss typical of waterlogged ecotopes and damp habitats. Thus, although geochemical proxies indicated an ombrotrophic regime in the mire, geomorphological characteristics may make a considerable contribution to environmental conditions.

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“…Because trees are long-lived and tree fossils are abundant in the fossil record, workers have long sought to gain physiological (Gessler et al, 2009;Offermann et al, 2011) or environmental information from the oxygen isotope composition of both modern (Brienen et al, 2012;Knorre et al, 2010;Loader et al, 2010Loader et al, , 2007McCarroll and Loader, 2004;Poussart et al, 2004;Rinne et al, 2013;Saurer et al, 2008;Treydte et al, 2006;Young et al, 2015) and ancient wood (Jahren and Sternberg, 2002, 2008Richter et al, 2008a;Wolfe et al, 2012). Cellulose has been the substrate of choice because it is resistant to degradation (e.g., Griffith et al, 2008;Jahren and Sternberg, 2002) and can be extracted from heterogeneous lignin complexes (Green, 1963 (Csank et al, 2013;Richter et al, 2008b;Saurer et al, 1997;Sternberg et al, 2007;Waterhouse et al, 2002;Yakir and DeNiro, 1990). Most of this work has been performed using whole leaf tissues or whole tree-rings due to the large amount of plant tissue required for classical isotope analysis (e.g., Sternberg, 1989).…”

Section: Introductionmentioning

confidence: 99%

Seasonal temperature and precipitation recorded in the intra-annual oxygen isotope pattern of meteoric water and tree-ring cellulose

Schubert

Jahren

2015

Quaternary Science Reviews

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Oxygen isotope ratios of cellulose-derived phenylglucosazone: An improved paleoclimate indicator of environmental water and relative humidity

Cited by 36 publications

References 32 publications

Temperature versus species-specific influences on the stable oxygen isotope ratio of tree rings

Temperature versus species-specific influences on the stable oxygen isotope ratio of tree rings

Biomarkers and inorganic proxies in the paleoenvironmental reconstruction of mires: The importance of landscape in Las Conchas (Asturias, Northern Spain)

Seasonal temperature and precipitation recorded in the intra-annual oxygen isotope pattern of meteoric water and tree-ring cellulose

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