14C characteristics of dissolved lignin along a forest soil profile

Jia, Juan; Feng, Xiaojuan; Pannatier, Elisabeth Graf; Wacker, Lukas; McIntyre, Cameron; Voort, Tessa Sophia van der; Montluçon, Daniel B.; Eglinton, Timothy I.

doi:10.1016/j.soilbio.2019.06.005

Cited by 10 publications

(6 citation statements)

References 29 publications

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“…Plant-derived DOM has been previously characterized as more unsaturated and aromatic than microorganism-derived DOM components (Einsiedl et al, 2007;Fellman et al, 2008). The high proportions of polyphenols in H31, H32, and H51 likely identify contributions from the decay of the plant biopolymer lignin (Benk et al, 2018;Jia et al, 2019). In contrast to the contributions of plant-derived DOM to wells H31, H32, and H51, we found high proportions of unsaturated aliphatic and peptide-like DOM components in well H53, indicating microorganism-derived DOM (Kallenbach et al, 2016).…”

Section: Spatial Patterns In Dom Compositionmentioning

confidence: 50%

Fueling Diversity in the Subsurface: Composition and Age of Dissolved Organic Matter in the Critical Zone

et al. 2019

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Surface ecosystems are rapidly changing on a global scale and it is important to understand how this influences aquifers in the subsurface, as groundwater quality is a major concern for future generations. Dissolved organic matter (DOM) contains molecular and isotopic signals from surface-derived inputs as well as from the biotic and abiotic subsurface environment and is therefore ideal to study the connectivity between both environments. We evaluated a 3-year time series of DOM composition using ultrahigh resolution mass spectrometry and age using 14 C accelerator mass spectrometry along a hillslope well transect in the fractured bedrock of the Hainich Critical Zone Exploratory, Germany. We found a wide range of DOM 14 C depletion, from 14 C = −47.9 to 14 C = −782.4, within different zones of the shallow groundwater. The 14 C content of DOM mirrored the connectivity of the aquifers to the surface. The composition of DOM was highly interrelated with its 14 C age. The proportions of surface-derived DOM components decreased with DOM age, whereas microorganismderived DOM components increased. The intensity of surface-sourced DOM signals differed between the wells and likely reflected the hydrological complexity of fracturedrock environments. During recharge, DOM was more enriched in 14 C, contained more surface-derived molecular components and was more diverse. As a potential response to the varying DOM substrate, bacterial 16S rRNA gene analysis revealed community evolution and increased bacterial diversity during recharge. The influx of diverse, surface-derived DOM potentially fueled evolution within the autochthonous bacterial communities, as in contrast to DOM, the bacterial community did not retreat to the initial diversity and community composition during the recession period. Our results demonstrate on the one hand that combined analyses of the composition and age of groundwater DOM strongly contribute to the understanding of interconnections, community evolution and the functioning of subsurface ecosystems and on the other hand that changes in surface ecosystems have an imprint on subsurface ecosystems.

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Section: Spatial Patterns In Dom Compositionmentioning

confidence: 50%

Fueling Diversity in the Subsurface: Composition and Age of Dissolved Organic Matter in the Critical Zone

et al. 2019

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“…Regarding our calculated contribution from GOC to OC in the sediments, the assumed range of biogenic 14 C ages from 1,000-4,000 yrs. BP is within the typical range for ages of dissolved OC leaching from soils (Artinger et al, 1996, Jia et al, 2019. Despite this, the range from 1,000-4,000 yrs.…”

Section: Geogenic Organic Carbon In the Sedimentsmentioning

confidence: 58%

Geogenic organic carbon in terrestrial sediments and its contribution to total soil carbon

Kalks¹,

Noren²,

Mueller³

et al. 2020

Preprint

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Abstract. Geogenic organic carbon (GOC) from sedimentary rocks is an overlooked fraction in soils that has not been quantified yet, influencing the composition, age and stability of total organic carbon (OC) in soils. In this context GOC is referred to as the OC in bedrocks deposited during sedimentation. However, the contribution of GOC to total soil OC varies with the type of bedrock. So far studies investigating the contribution of GOC derived from different terrestrial sedimentary rocks to soil OC contents are missing. In order to fill this gap, we analysed 10 m long sediment cores at three sites recovered from Pleistocene Loess, Miocene Sand and Triassic Red Sandstone and calculated the amount of GOC based on 14C measurements. 14C ages of bulk sedimentary OC revealed that OC represents a mixture of biogenic and geogenic components. Biogenic refers to OC that entered the sediments recently from plant sources. All sediments contain considerable amounts of GOC (median amounts of 0.10 g kg−1 at the Miocene Sand, 0.27 g kg−1 at the Pleistocene Loess and 0.17 at Red Sandstone) in comparison to subsoil OC contents (between 0.53–15.21 g kg−1). Long-term incubation experiments revealed that this GOC seemed to be comparatively stable against biodegradation. Its possible contribution to subsoil OC stocks (0.3–1.5 m depth) is ~ 2.5 % in soil developed in the Miocene Sand, ~ 8 % in the Loess soil and ~ 12 % at the Red Sandstone site. Thus GOC having no detectable 14C contents influences 14C ages of subsoil OC and thus may partly explain the strong 14C ages increase observed in many subsoils. This is particularly important in soils on terrestrial sediments with comparatively low amounts of OC, where GOC can considerably contribute to total OC stocks.

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“…The OCL OC value displayed a contrary tendency to the N/C ratio (Figure B) for the soil at different depths, indicating that SOM in the topsoil (above 40 cm) accumulated more aromatic carbon than the subsoil. In general, plant-derived OM is dominated by lignins and tannin-like substances, which are more resistant to degradation due to their stable aromatic structure, especially in the early stages of decomposition, , or the inhibitory effects of these compounds on enzyme activity, while microbial-derived OM mainly contains polysaccharides, lipids, and protein-like substances, which are composed of a majority of aliphatic carbons. − Previous studies have reported that plant-derived polyphenol compounds and tannins can be selectively adsorbed to reactive iron/aluminum minerals and become less abundant in deeper soils. ,− This may lead to a low accumulation of aromatic carbons in the underlying soil, and the OCL OC values successfully reflected such change of SOM in the forest soil profile. In addition, we can roughly estimate the aromatic C% in SOM according to the obtained linear equation (aromatic C% = 6.03 × OCL OC + 9.71, R 2 = 0.89, p < 0.001).…”

Section: Resultsmentioning

confidence: 99%

A Novel Strategy to Evaluate the Aromaticity Degree of Natural Organic Matter Based on Oxidization-Induced Chemiluminescence

Han

Luo

et al. 2020

Environ. Sci. Technol.

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Due to its complex composition and structure, many of the properties of natural organic matter (NOM) are poorly understood. In this study, the oxidizationinduced chemiluminescence (OCL) of NOM was investigated, and a flow-injection OCL method was developed using alkaline persulfate-H 2 O 2 as the oxidizing agent. The method is suitable for the direct analysis of NOM in both homogeneous and heterogeneous samples without isolation or concentration. A strong linear relationship (p < 0.001) was found between the normalized organic carbon OCL (OCL OC ) and the percentage of aromatic carbon in standard NOM and soil samples, suggesting that OCL OC can be used as an empirical indicator to assess the aromaticity degree of NOM in both homogeneous and heterogeneous samples. By using this method, the percentages of aromatic carbon in a forest soil profile with low organic carbon content were estimated, and a decrease in the degree of aromaticity in deeper soil was observed. Considering the high sensitivity (lower than 0.1 mg C L −1 ) and throughput (13 s per detection) and low sample consumption (less than 1 mg) of the method, the proposed OCL OC indicator shows great promise for the high-throughput evaluation of the aromaticity degree of NOM for a wide variety of environmental and geochemical samples.

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14C characteristics of dissolved lignin along a forest soil profile

Cited by 10 publications

References 29 publications

Fueling Diversity in the Subsurface: Composition and Age of Dissolved Organic Matter in the Critical Zone

Fueling Diversity in the Subsurface: Composition and Age of Dissolved Organic Matter in the Critical Zone

Geogenic organic carbon in terrestrial sediments and its contribution to total soil carbon

A Novel Strategy to Evaluate the Aromaticity Degree of Natural Organic Matter Based on Oxidization-Induced Chemiluminescence

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