Analysis of non-cellulosic polysaccharides helps to reveal the history of thick organic surface layers on calcareous Alpine soils

Prietzel, Jörg; Dechamps, Nicolas; Spielvogel, Sandra

doi:10.1007/s11104-012-1340-2

Cited by 28 publications

(16 citation statements)

References 39 publications

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“…Zech et al, 2012a), while sugar concentrations are as high as in other vascular plants (e.g. Hepp et al, 2016;Prietzel et al, 2013). For the coniferous soil samples this means that the n-alkanes stem most likely from the understorey whereas the sugars originate from grasses and coniferous needles.…”

Section: δ 2 H Source-water and δ 18 O Source-water Reconstructionsmentioning

confidence: 98%

“…Deciduous trees produce lots of leaf waxes and sugars (e.g. Prietzel et al, 2013;M. Zech et al, 2012a), and all biomarkers reflect and record the evapotranspirative enrichment of the leaf water (e.g.…”

Section: δ 2 H Source-water and δ 18 O Source-water Reconstructionsmentioning

confidence: 99%

“…Lipid biomarkers in particular are increasingly used for paleoclimate and environmental reconstructions (e.g. Brincat et al, 2000;Eglinton and Eglinton, 2008;Rach et al, 2014;Romero-Viana et al, 2012;Schreuder et al, 2016). However strengths and limitations of respective proxies need to be known (Dang et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of bacterial glycerol dialkyl glycerol tetraether and 2H–18O biomarker proxies along a central European topsoil transect

et al. 2020

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Molecular fossils, like bacterial branched glycerol dialkyl glycerol tetraethers (brGDGTs), and the stable isotopic composition of biomarkers, such as δ 2 H of leaf waxderived n-alkanes (δ 2 H n-alkane ) or δ 18 O of hemicellulosederived sugars (δ 18 O sugar ), are increasingly used for the reconstruction of past climate and environmental conditions. Plant-derived δ 2 H n-alkane and δ 18 O sugar values record the isotopic composition of plant source water (δ 2 H source-water and δ 18 O source-water ), which usually reflects mean annual precipitation (δ 2 H precipiation and δ 18 O precipiation ), modulated by evapotranspirative leaf water enrichment and biosynthetic fractionation (ε bio ). Accuracy and precision of respective proxies should be ideally evaluated at a regional scale. For this study, we analysed topsoils below coniferous and deciduous forests as well as grassland soils along a central European transect in order to investigate the variability and robustness of various proxies and to identify effects related to vegetation. Soil pH values derived from brGDGTs correlate reasonably well with measured soil pH values but are systematically overestimated ( pH = 0.6 ± 0.6). The branched vs. isoprenoid tetraether index (BIT) can give some indication whether the pH reconstruction is reliable. Temperatures derived from brGDGTs overestimate mean annual air temperatures slightly ( T MA = 0.5 • C ± 2.4). Apparent isotopic fractionation (ε n-alkane/precipitation and ε sugar/precipitation ) is lower for grassland sites than for forest sites due to signal damping; i.e. grass biomarkers do not record the full evapotranspirative leaf water enrichment. Coupling δ 2 H n-alkane with δ 18 O sugar allows us to reconstruct the stable isotopic composition of the source water more accurately than without the coupled approach ( δ 2 H = ∼ −21 ‰ ± 22 ‰ and δ 18 O = ∼ −2.9 ‰ ± 2.8 ‰). Similarly, relative humidity during daytime and the vegetation period (RH MDV ) can be reconstructed using the coupled isotope approach ( RH MDV =∼ −17 ± 12). Especially for coniferous sites, reconstructed RH MDV values as well as source water isotope composition underestimate the measured values. This can likely be explained by understorey grass vegetation at the coniferous sites contributing significantly to the n-alkane pool but only marginally to the sugar pool in the topsoils. Vegetation-dependent variable signal damping and ε bio (regarding 2 H between n-alkanes and leaf water) along our European transect are difficult to quantify but likely contribute to the observed underestimation in the source water isotope composition and RH reconstructions. Microclimate variability could cause the rather large uncertainties. Vegetation-related effects do, by contrast, not affect the brGDGT-derived reconstructions. Overall, GDGTs and the coupled δ 2 H n-alkane -δ 18 O sugar approach have great potential for more quantitative paleoclimate reconstructions.

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Section: δ 2 H Source-water and δ 18 O Source-water Reconstructionsmentioning

confidence: 98%

Section: δ 2 H Source-water and δ 18 O Source-water Reconstructionsmentioning

confidence: 99%

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Evaluation of bacterial glycerol dialkyl glycerol tetraether and 2H–18O biomarker proxies along a central European topsoil transect

et al. 2020

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“…Dolomite samples were retrieved from the Hauptdolomit formation from Guggenauer Köpfl (Biermayer & Rehfuess, ). The O‐horizon from the same location was assumed to be free of inorganic carbon and was used as the OC samples (Prietzel et al ., ). The recovered dolomite pieces were washed to remove external contamination and then crushed, sieved and ground to a particle size of ˂0.2 mm.…”

Section: Methodsmentioning

confidence: 97%

Measurement of organic and inorganic carbon in dolomite‐containing samples

Vuong

Prietzel

Heitkamp

2015

Soil Use and Management

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It is still open to question which method is the best for quantifying organic carbon (OC) and inorganic carbon (IC) in soils containing dolomite. The aims of this study were (1) to compare the accuracy of a novel thermal gradient (ThG), the classical calcimeter (CALC) and the loss-on-ignition (LOI) methods on a reference sample set with known proportions of OC present as soil organic matter (SOM) and IC present as dolomite and (2) to compare the results of the different methods on a set of soil samples with different dolomite and SOM contents. The CALC and LOI methods rely on separate quantification or removal of IC by acid or heat, whereas IC and OC can be quantified in a single run by the ThG analysis. The ThG method was the most accurate method for the reference sample set, especially when dolomite contents were high. On the soil sample set, the ThG and CALC methods performed equally well, but only when two outliers were eliminated. The LOI method was not satisfactory for either sample set. Overall, ThG was the most reliable method for measuring IC and OC in dolomite-containing samples over a wide range of concentrations, but the more widely used CALC method was also acceptable.

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“…Deciduous trees produce lots of leaf waxes and sugars (e.g. Prietzel et al, 2013;Zech et al, 2012a), and all biomarkers reflect and record the evapotranspirative enrichment of the leaf water (e.g. Cernusak et al, 2016;Tuthorn et al, 2014).…”

Section: δ 2 H/δ 18 Osource-water Reconstructionsmentioning

confidence: 99%

Evaluation of bacterial glycerol dialkyl glycerol tetraether and 2H-18O biomarker proxies along a Central European topsoil transect

Hepp¹,

Schäfer²,

Lanny³

et al. 2019

Preprint

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Abstract. Molecular fossils, like bacterial branched glycerol dialkyl glycerol tetraethers (brGDGTs), and the stable isotopic composition of biomarkers, such as &#948;2H of leaf wax-derived n-alkanes (&#948;2Hn-alkane) or &#948;18O of hemicellulose-derived sugars (&#948;18Osugar) are increasingly used for the reconstruction of past climate and environmental conditions. Plant-derived &#948;2Hn-alkane and &#948;18Osugar values record the isotopic composition of plant source water (&#948;2H/&#948;18Osource-water), which usually reflects mean annual precipitation (&#948;2H/&#948;18Oprecipiation), modulated by evapotranspirative leaf water enrichment and biosynthetic fractionation. Accuracy and precision of respective proxies should be ideally evaluated at a regional scale. For this study, we analysed topsoils below coniferous and deciduous forests, as well as grassland soils along a Central European transect in order to investigate the variability and robustness of various proxies, and to identify effects related to vegetation. Soil pH-values derived from brGDGTs correlate reasonably well with measured soil pH-values, but systematically overestimate them (&#916;pH&#8201;=&#8201;0.6&#8201;&#177;&#8201;0.6). The branched vs. isoprenoid tetraether index (BIT) can give some indication whether the pH reconstruction is reliable. Temperatures derived from brGDGTs overestimate mean annual air temperatures slightly (&#8710;TMA&#8201;=&#8201;0.5&#8201;&#176;C&#8201;&#177;&#8201;2.4). Apparent isotopic fractionation (&#949;n-alkane/precipitation and &#949;sugar/precipitation) is lower for grassland sites than for forest sites due to &quot;signal damping&quot;, i.e. grass biomarkers do not record the full evapotranspirative leaf water enrichment. Coupling &#948;2Hn-alkane with &#948;18Osugar allows to reconstruct the stable isotopic composition of the source water more accurately than without the coupled approach (&#916;&#948;2H&#8201;=&#8201;~-21&#8201;&#8240;&#8201;&#177;&#8201;22 and &#916;&#948;18O&#8201;=&#8201;~-2.9&#8201;&#8240;&#8201;&#177;&#8201;2.8). Similarly, relative humidity during daytime and vegetation period (RHMDV) can be reconstructed using the coupled isotope approach (&#916;RHMDV&#8201;=&#8201;~-17&#8201;&#177;&#8201;12). Especially for coniferous sites, reconstructed RHMDV values as well as source water isotope composition underestimate the measured values. This can be likely explained by understory grass vegetation at the coniferous sites contributing significantly to the n-alkane pool but only marginally to the sugar pool in the topsoil. The large uncertainty likely reflect the fact that biosynthetic fractionation is not constant, as well as microclimate variability. Overall, GDGTs and the coupled &#948;2Hn-alkane-&#948;18Osugar approach have great potential for more quantitative paleoclimate reconstructions.

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Analysis of non-cellulosic polysaccharides helps to reveal the history of thick organic surface layers on calcareous Alpine soils

Cited by 28 publications

References 39 publications

Evaluation of bacterial glycerol dialkyl glycerol tetraether and <sup>2</sup>H–<sup>18</sup>O biomarker proxies along a central European topsoil transect

Evaluation of bacterial glycerol dialkyl glycerol tetraether and <sup>2</sup>H–<sup>18</sup>O biomarker proxies along a central European topsoil transect

Measurement of organic and inorganic carbon in dolomite‐containing samples

Evaluation of bacterial glycerol dialkyl glycerol tetraether and <sup>2</sup>H-<sup>18</sup>O biomarker proxies along a Central European topsoil transect

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Analysis of non-cellulosic polysaccharides helps to reveal the history of thick organic surface layers on calcareous Alpine soils

Cited by 28 publications

References 39 publications

Evaluation of bacterial glycerol dialkyl glycerol tetraether and &lt;sup&gt;2&lt;/sup&gt;H–&lt;sup&gt;18&lt;/sup&gt;O biomarker proxies along a central European topsoil transect

Evaluation of bacterial glycerol dialkyl glycerol tetraether and &lt;sup&gt;2&lt;/sup&gt;H–&lt;sup&gt;18&lt;/sup&gt;O biomarker proxies along a central European topsoil transect

Measurement of organic and inorganic carbon in dolomite‐containing samples

Evaluation of bacterial glycerol dialkyl glycerol tetraether and &lt;sup&gt;2&lt;/sup&gt;H-&lt;sup&gt;18&lt;/sup&gt;O biomarker proxies along a Central European topsoil transect

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Evaluation of bacterial glycerol dialkyl glycerol tetraether and <sup>2</sup>H–<sup>18</sup>O biomarker proxies along a central European topsoil transect

Evaluation of bacterial glycerol dialkyl glycerol tetraether and <sup>2</sup>H–<sup>18</sup>O biomarker proxies along a central European topsoil transect

Evaluation of bacterial glycerol dialkyl glycerol tetraether and <sup>2</sup>H-<sup>18</sup>O biomarker proxies along a Central European topsoil transect