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Título

Signature of pyrolitic alkanes for the assessment of soil carbon sequestation

AutorJiménez-González, Marco A. CSIC ORCID; Almendros Martín, Gonzalo CSIC ORCID ; Álvarez, Ana María; Carral, Pilar; Álvarez, Ana María; González-Pérez, José Antonio CSIC ORCID ; Jiménez Morillo, N. T. CSIC ORCID; González-Vila, Francisco Javier CSIC ORCID
Fecha de publicación9-may-2016
EditorCentre national de la recherche scientifique (France)
Citación21st. International Symposium on Analytical and Applied. Pyrolysis, 9-12 May 2016, Nancy, France
ResumenSurrogate descriptors of the performance of soil C sequestration, which is reflected in the highly variable content of organic matter in the different ecosystems, are not yet well established. Therefore, their identification is relevant in understanding Earth's biogeochemical cycle and global change. This research consists of an exploratory multivariate statistical approach 00 the qualitative and quantitative assessment of biogeochemical factors involved in organic C sequestration in the soil, using an “omic” approach not requiring a detailed knowledge of the structure of the material under study. With this purpose, we have carried out a series of chemometric approaches on a collection of differing soils. The work is focused on the information provided solely by the n-alkane homologues released by analytical pyrolysis from samples of 32 representative Mediterranean soils under a large variety of vegetation, use and geological substrate. The identification and quantification of n-alkanes by pyrolysis-gas chromatography-mass spectrometry (Py-GC/MS) of whole soil samples was carried out using a double shot pyrolyzer PY2020iD (Frontier Labs Ltd., Fukushima, Japan). The m/z 85 ion trace was selected to identify the homologous series, which were integrated and tabulated from nonane (C9H20) to hentriacontane (C31H64) in all soil samples. In order to quantify the complexity of the alkane series the Shannon-Weaber biodiversity index was calculated. Partial least squares (PLS) regression was applied to forecast soil C concentration in terms of the composition of the alkane assemblages. A series of previous multivariate data treatments mainly cluster analysis of variables (alkanes) by multidimensional scaling and principal component analysis to classify observations (soil samples) lead to the suggestion that significant correlation exits between soil C storage and the molecular composition of the pyrolytic alkanes. In particular the biodiversity index calculated exclusively from the n-alkanes was significantly correlated with the soil e content (P < O.05) . Furthennore, the statistical significance of the correlations found increased when the diversity was calculated from the odd-C numbered alkanes (presumably consisting of biogenic compounds rather than pyrolytic fragments). Further logarithmic transformations of the data to reduce the, influence of the outliers lead to highly significant (P < 0.01) correlation models. In fact, automatic classification of the n-alkanes by Le., principal component analysis, revealed three sharp clusters, reflecting the possible different origin depending of the chain' length: a first group of alkanes between 9 and 18 carbons (presumably pyrolytic fragments. or microbial products), a second group from 19 to 24 carbons, and a well-defined group of alkanes with 25 to 31 carbons, presumably including alkanes released by rapid thermoevaporation such could be those derived from epicuticular waxes of vascular plants. In conclusion, our results show that the sole analysis of the pyrolytic signature of n-alkanes from whole soil samples provide information useful to explain the potential C sequestration of the soil. In particular it is hypothesized that the high complexity of the n-alkane assemblages is reflecting overlapped activity of widely differing groups of organisms present in the plant-soil trophic system. This would be connected with a high functional redundancy of the soil, which is considered an index for soil health and resilience, at least in terms of the potential of soil endogenous resources to response to external perturbation.
URIhttp://hdl.handle.net/10261/160320
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