The use of amino acid analyses in (palaeo-) limnological investigations: A comparative study of four Indian lakes in different climate regimes

Menzel, Philip; Anupama, K.; Basavaiah, N.; Das, B. K.; Gaye, Birgit; Herrmann, Nicole; Prasad, Sushma

doi:10.1016/j.gca.2015.03.028

Cited by 23 publications

(15 citation statements)

References 63 publications

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“…In WLD sediments, the most enriched amino acids with diagenesis are Gly, Asp, and alanine while the most depleted amino acids include leucine, Phe, isoleucine, and arginine (Figure a). This finding is consistent with the alteration that occurs in soils, sinking marine particles, and lake sediments (Dauwe et al, ; Menzel et al, ; Philben et al, ), and the DI is positively correlated with AA‐N ( r 2 = 0.42, p < 0.05; Figure b), where the less degraded OM has a high DI and a greater contribution of amino acid nitrogen to the total nitrogen. Therefore, the overall evidence suggests that the change in amino acid composition is due to degradation.…”

Section: Discussionsupporting

confidence: 86%

Factors Controlling Storage, Sources, and Diagenetic State of Organic Carbon in a Prograding Subaerial Delta: Wax Lake Delta, Louisiana

et al. 2019

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Wax Lake Delta, southern Louisiana, is a coastal delta that formed following the dredging of a river channel in 1941 and is a field model for investigating the geomorphology, ecology, carbon dynamics, and carbon storage capacity in young prograding deltas. However, it is unknown how the transition from subaqueous to subaerial sediments affects the sources and quality of the sequestered carbon. We investigated these variations within the sediments of Wax Lake Delta using amino acid, lignin, and stable carbon isotope compositions of the organic matter (OM). A principal component analysis of these proxies highlighted variability in organic carbon (OC) composition with changes in elevation. The transition from subaqueous to subaerial sediments at 0‐cm mean lower low water is an important component of the OM composition. In addition to the changes observed for OM source and quality, the OC loadings (OC/SA; mg C/m2) also increase as the delta aggrades and accumulates sediments with loadings typical of delta topsets and mobile mud banks (OC/SA < 0.4) to riverine sediments (0.5 < OC/SA < 1) and eventually to highly productive regions (OC/SA > 1). Linking this multiproxy approach with environmental variables such as elevation provides a path for incorporating OM dynamics into geomorphic models.

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Section: Discussionsupporting

confidence: 86%

Factors Controlling Storage, Sources, and Diagenetic State of Organic Carbon in a Prograding Subaerial Delta: Wax Lake Delta, Louisiana

et al. 2019

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“…Amino acids were derivatized using a Phenomenez EZ:Faast kit (Phenomenex, USA) and separated by gas chromatography using a Phenomenex ZB-AAA column and quantified with a flame ionization detector. We assessed the extent of SOM diagenesis by calculating a degradation index based on differences in amino acid composition analogous to degradation indices developed by Dauwe et al (1999) and Menzel et al (2015) to interpret the extent of diagenesis of sedimentary organic matter in marine and lacustrine systems. A principle component analysis (PCA) identifying the most significant trends in the full amino acid composition was employed using the mole % composition of each of the 14 amino acids analyzed in the pooled litter samples and in the L, F, H, and B horizons in the soil profiles (see Supplementary Information for details).…”

Section: Soil Carbon Stocks and Organic Matter Chemistrymentioning

confidence: 99%

Climate Warming Can Accelerate Carbon Fluxes without Changing Soil Carbon Stocks

et al. 2017

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“…acid, which was then summed for each sample. The THAA results were also used to determine the degradation index, 25 commonly used for interpreting the extent organic matter diagenesis in aquatic environments (Dauwe et al, 1999;Dauwe and Middelburg, 1998;Menzel et al, 2015). The index was modified for use at the sites used in the current study to permit assessment of the degradation state of the sites' soil organic matter pools (Philben et al 2016).…”

Section: Discussionmentioning

confidence: 99%

Biochemical and structural controls on the decomposition dynamics of boreal upland forest moss tissues

Philben¹,

Butler²,

Billings³

et al. 2018

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Abstract.Mosses contribute an average of 20% of upland boreal forest net primary productivity and are frequently observed to degrade slowly compared to vascular plants. If this is caused primarily by the chemically complexity of their tissues, moss decomposition could exhibit high temperature sensitivity (measured as Q10) due to high activation energy, which would imply soil organic carbon (SOC) stocks derived from moss remains are especially vulnerable to decomposition with warming. Alternatively, the physical structure of the moss cell wall biochemical matrix could 20 inhibit decomposition, resulting in low decay rates and low temperature sensitivity. We tested these hypotheses by incubating mosses collected from two boreal forests in Newfoundland, Canada, for 959 days at 5 and 18°C, while monitoring changes in the moss tissue composition using total hydrolysable amino acid (THAA) analysis and 13 C NMR spectroscopy. Less than 40% of C was respired in all incubations, revealing a large pool of apparently recalcitrant C. The decay rate of the labile fraction increased in the warmer treatment, but the total amount of C loss 25 increased only slightly, resulting in low Q10 values (1.23-1.33) compared to L horizon soils collected from the same forests. NMR spectra were dominated by O-alkyl C throughout the experiment, indicating the persistence of potentially labile C. Accumulation of hydroxyproline (derived primarily from plant cell wall proteins) and aromatic C indicates selective preservation of biochemicals associated with the moss cell wall. This was supported by scanning electron microscope (SEM) images of the moss tissues, which revealed few changes in the physical structure of the 30 cell wall after incubation. This suggests the moss cell wall matrix protected labile C from microbial decomposition, accounting for the low temperature sensitivity of moss decomposition despite low decay rates. Climate drivers of moss biomass and productivity, therefore, represent a potentially important regulator of boreal forest SOC responses to climate change that needs to be assessed to improve our understanding of carbon-climate feedbacks.

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The use of amino acid analyses in (palaeo-) limnological investigations: A comparative study of four Indian lakes in different climate regimes

Cited by 23 publications

References 63 publications

Factors Controlling Storage, Sources, and Diagenetic State of Organic Carbon in a Prograding Subaerial Delta: Wax Lake Delta, Louisiana

Factors Controlling Storage, Sources, and Diagenetic State of Organic Carbon in a Prograding Subaerial Delta: Wax Lake Delta, Louisiana

Climate Warming Can Accelerate Carbon Fluxes without Changing Soil Carbon Stocks

Biochemical and structural controls on the decomposition dynamics of boreal upland forest moss tissues

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