Spatial variability of soil lipids reflects vegetation cover in a French peatland

Zocatelli, Renata; Jacob, Jérémy; Gogo, Sébastien; Milbeau, Claude Le; Rousseau, J; Laggoun‐Défarge, Fatima

doi:10.1016/j.orggeochem.2014.07.016

Cited by 16 publications

(14 citation statements)

References 53 publications

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“…Among the myriad of organic constituents preserved in soils, solvent-extractable compounds, including carbohydrates, alkanoic acids, alkanols, alkanes, steroids, and terpenoids, may yield information on the relative contribution of plants versus microbes as well as on the relative abundance of compounds with varied degradabilities (Feng & Simpson, 2007;Kaiser et al, 2002). Over the past few decades, solvent-extractable compounds have been applied to examine SOM dynamics in response to changing environmental conditions, such as climate (Feng et al, 2008;Naafs et al, 2004;Rushdi et al, 2016), vegetation shifts (Jandl et al, 2006;Wiesenberg et al, 2010;Zocatelli et al, 2014), and land use changes (Pisani et al, 2016;Zhao et al, 2014). It is found that solvent-extractable aliphatic lipids that are relatively resistant to decomposition tend to accumulate with higher temperatures (Feng et al, 2008;Pisani et al, 2014) and at low soil pHs (Bull et al, 2000;Nierop et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Large‐Scale Distribution of Molecular Components in Chinese Grassland Soils: The Influence of Input and Decomposition Processes

Dai

Zhu

et al. 2018

JGR Biogeosciences

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Chinese grasslands hold a third of the national soil organic carbon (OC) stocks but remain poorly investigated in terms of soil molecular components and their distribution patterns. Such information is important for understanding mechanisms governing grassland soil OC dynamics and its response to global changes. Here employing solvent‐extractable compounds as a group of widely used biomarkers, we present a large‐scale study on the distribution of different soil OC components (including plant‐ and microbial‐derived carbohydrates and aliphatic and cyclic lipids) in the surface soils of Chinese grasslands, spanning from temperate grasslands in the arid/semiarid regions to alpine grasslands on the Qinghai‐Tibetan Plateau. We show that alpine grassland soils are more enriched with carbohydrates and plant‐derived compounds relative to the temperate counterparts due to temperature‐inhibited decomposition. While plant belowground biomass plays a key role in explaining the spatial variation of compounds in the alpine grasslands, climatic variables do in the temperate region. In particular, aliphatic lipids accumulate with increasing mean annual temperature in the temperate grasslands due to a preferential decay of labile soil OC, whereas they decrease in the alpine grasslands owing to dilution by an enhanced plant input of nonlipid components. Collectively, these results demonstrate different mechanisms governing the distribution of solvent‐extractable compounds in grassland soils, with climate‐mediated decomposition processes dominating in the temperate grasslands and plant inputs being more important in the alpine region. In the context of climate change, alterations to soil OC input and decomposition processes may have varied impacts on soil carbon cycling in these two regions.

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Section: Introductionmentioning

confidence: 99%

Large‐Scale Distribution of Molecular Components in Chinese Grassland Soils: The Influence of Input and Decomposition Processes

Dai

Zhu

et al. 2018

JGR Biogeosciences

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“…One of the reasons may be that a widely spread procedure for extract pretreatment prior to gas chromatography/ mass spectroscopy analysis involves acetylation [25], which would mask the naturally occurring acetyl-derivatives. Among the few records of triterpenyl acetates in sediments, it can be mentioned those recorded in a peatland topsoil with an acetate group at C-3 and with oleanane, ursane, friedelane, and isobauerane skeleton [26], and their MeO counterparts that have been recorded in Gramineae [27] and in turf and related lake sediments [28,29]. Bauerenyl and hopenyl with an acetate group at C-3 have also been recorded in Asteraceae plants [30,31] and hopenyl and lupenyl acetates have been detected in large amounts in propolis extracted from beehives [32,33].…”

Section: Introductionmentioning

confidence: 99%

Significance of the High Abundance of Pentacyclic Triterpenyl and Hopenyl Acetates in Sphagnum Peat Bogs from Northern Spain

et al. 2019

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Global warming is expected to increase the rate of CH4 emission from acidic peatlands leading to an increased interest on its mechanisms of formation. The main routes are through the reduction of CO2 by molecular hydrogen and through the cleavage of acetate. A predominance of the former, a reaction which also competes with homoacetogenesis to form acetate, may enrich the media in acetate, which could potentially be incorporated in the peat molecular markers. Acetates of triterpenoid biomarkers have been identified in peats and lake sediments and related to the input of higher plants. Nevertheless, the acetyl derivatives are found in very low amounts in fresh plants and in much lower amount than other derivatives with alcohol or ketone functional groups. The dichloromethane/methanol extracts of Asturian peat bog profiles (North Spain) were analyzed using gas chromatography/mass spectrometry (GC/MS) and compound-specific-isotope-analysis (CSIA). They show abundance of acetates of compounds with oleanane, ursane, and lupane skeletons derived from higher plants and with hopane skeleton, which can be considered a characteristic of these peats. Two families of 3-oxyhopenyl acetates with -17(21)- and -22(29)- configurations were detected in the upper part of the peat profiles, having a δ13C isotopic composition enriched by 4‰ compared with that of higher plant triterpenoids, and similar to that of microorganism-derived regular hopanoids. Both the acetate and ketone derivatives with the oxygenated functionality at C-3 were generally present in a given extract and tended to accumulate at certain depth in the profiles and in specific levels. The widespread occurrence of acetyl-derivatives, their higher concentration in the deeper layers of the peat, the fact that the acetates correspond to different compound families of diverse source and the very low amount of acetates identified in Ericaceae-contributing to the peat compared to the alcohols suggest that they were formed in the peat under particularly favorable environmental conditions. We postulate that these conditions could have been the existence of a medium enriched in acetic acid produced by the dominance of hydrogenotrophic methanogenesis and/or homoacetogenesis over acetoclastic methanogenesis. This phenomenon that has been preferentially described in Sphagnum bogs at high latitudes, and in the deeper layers of peat, appears to be also present in the temperate peats of the Asturian coast.

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“…Biomarkers have frequently been used to assess organic matter sources and transport and environmental changes in aquatic environments (e.g., Tulipani et al, ; Zhang et al, ; Zhou et al, ; Zocatelli et al, ). The concept has been successfully applied in a variety of ecosystems in the Florida Everglades, including freshwater marshes (Mead et al, ; Saunders et al, ), mangrove forests (He et al, ), and coastal marine environments (Xu et al, , ) leading to the development of source‐specific molecular markers applicable as proxies for organic matter source, transport, and fate.…”

Section: Introductionmentioning

confidence: 99%

“…Lipid biomarkers are abundant in plant waxes (Bush & McInerney, ) and have proved particularly useful to distinguish organic matter sources of different biomass, including terrestrial plants, algae, and bacteria (e.g., Schellekens & Buurman, ; Seki et al, ; Tulipani et al, ). Ratios of n‐alkanes like the average chain length and the aquatic proxy (Paq) have been widely used to trace historical changes in vegetation (Ficken et al, ; Tareq et al, ; Zocatelli et al, ). Of these proxies, the Paq is specifically useful to discriminate between organic matter inputs from emergent and submerged aquatic plants (Ficken et al, ).…”

Section: Introductionmentioning

confidence: 99%

Sheet Flow Effects on Sediment Transport in a Degraded Ridge‐and‐Slough Wetland: Insights Using Molecular Markers

et al. 2018

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Wetland ecosystems are often characterized by self-organized landscape patterning, driven by abiotic and biotic factors. In the Florida Everglades, natural sheet flow is hypothesized to have distributed sediments to form the pattern of linear emergent ridges and submerged sloughs. Drainage and barriers to flow have degraded these microtopographic features. As part of the Comprehensive Everglades Restoration Plan, the Decompartmentalization Physical Model is a landscape-scale experiment to evaluate ecosystem responses to restored sheet flow by increasing freshwater inputs and removing barriers to flow. To test the proposed mechanism that flow rebuilds ridge-slough microtopography by remobilizing slough sediments into ridges, four molecular markers capable of distinguishing ridge, slough, and microbial sources were evaluated in flocculent benthic sediments (floc) and advected sediments (collected in traps) during preflow, high-flow, and postflow conditions over 4 years. The combined use of the four biomarkers, namely, the aquatic proxy (Paq), C 20 highly branched isoprenoids, kaurenes, and botryococcenes, showed compositional patterns that clearly distinguished ridge and slough organic matter. Of these molecular parameters, the Paq was the most reliable in distinguishing among organic matter sources. Long-term patterns in floc Paq at ridge and slough sites indicate a general increase, indicative of preferential mobilization of slough material. The Paq values for advected sediments are also strongly associated with slough environments, supporting temporal trends in floc samples. Our results tentatively confirm the hypothesis that increased flow in degraded ridge-and-slough wetlands, and associated sediment transport, is a potentially viable mechanism to restore historic patterns of microtopography.Plain Language Summary We examined how experimental flows within the Decompartmentalization Physical Model (DPM) altered the movement of benthic sediment (floc) in ridge and slough habitats, an important mechanism for restoring pattern and topography of the historic Everglades ridge-and-slough landscape. The approach is novel in utilizing molecular organic biomarkers that identify sources of organic matter from ridges and sloughs to infer the movement of floc. Results so far are promising in suggesting that sediment redistribution does occur and may over longer time periods help rebuild topography, an important objective of large-scale flow restoration projects such as those proposed in the Comprehensive Everglades Restoration Plan (CERP).

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Spatial variability of soil lipids reflects vegetation cover in a French peatland

Cited by 16 publications

References 53 publications

Large‐Scale Distribution of Molecular Components in Chinese Grassland Soils: The Influence of Input and Decomposition Processes

Large‐Scale Distribution of Molecular Components in Chinese Grassland Soils: The Influence of Input and Decomposition Processes

Significance of the High Abundance of Pentacyclic Triterpenyl and Hopenyl Acetates in Sphagnum Peat Bogs from Northern Spain

Sheet Flow Effects on Sediment Transport in a Degraded Ridge‐and‐Slough Wetland: Insights Using Molecular Markers

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