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Titre du document / Document title

Chemical composition and bioavailability of thermally altered Pinus resinosa (Red pine) wood

Auteur(s) / Author(s)

BALDOCK Jeffrey A. (1) ; SMERNIK Ronald J. (2) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) CSIRO Land and Water, PMB 2, Glen Osmond, SA 5064, AUSTRALIE
(2) Department of Soil and Water, University of Adelaide, PMB2, Glen Osmond, SA 5064, AUSTRALIE

Résumé / Abstract

The residues remaining after incomplete combustion of vegetation (char) can contribute significantly to the carbon content of soils. Char C is considered biologically inert relative to other forms of organic C in soils; however, the degree of biological inertness is likely to be a function of the extent that the combustion residues were altered during thermal treatment. The relationship between changes in chemical composition and biological inertness of char C created in the laboratory by heating Pinus resinosa sapwood to temperatures between 70 and 350 °C was quantified. Heating at each temperature was maintained until the mass of the residual char material stabilised (±2%). Chemical composition of the chars was assessed by elemental analysis, solid-state 13C nuclear magnetic resonance (NMR) spectroscopy and diffuse reflectance infrared Fourier transform spectroscopy (DRIFT). The susceptibility of the heated sapwood to biological oxidation was quantified in a 120-day laboratory incubation. Thermal treatment at temperatures ≥200 °C induced significant variations in chemical composition. Changes in elemental contents and molar elemental ratios were consistent with an initial dehydration and the formation of unsaturated structures. The NMR and DRIFT data indicated that the changes in the chemical composition with increasing heating temperature included a conversion of O-alkyl C to aryl and O-aryl furan-like structures, consistent with results from work examining the chemical changes associated with thermal treatment of cellulose, the major component of wood. The chemical changes significantly reduced the ability of a microbial inoculum derived from decomposing Pinus resinosa wood to mineralise carbon contained in the charred samples. The C mineralisation rate constants decreased by an order of magnitude for wood heated to ≥ 200 °C.

Revue / Journal Title

Organic geochemistry    ISSN  0146-6380 

Source / Source

2002, vol. 33, no9, pp. 1093-1109 (2 p.1/4)

Langue / Language

Anglais

Editeur / Publisher

Elsevier, Oxford, ROYAUME-UNI  (1977) (Revue)

Mots-clés anglais / English Keywords

Plantae

;

Spermatophyta

;

gymnosperms

;

Coniferales

;

Pinaceae

;

infrared methods

;

Fourier transformation

;

NMR spectra

;

thermal alteration

;

samples

;

cellulose

;

dehydration

;

oxidation

;

reflectance

;

spectroscopy

;

nuclear magnetic resonance

;

temperature

;

soils

;

carbon

;

proteins

;

combustion

;

wood

;

Pinus

;

chemical composition

;

lipids

;

lignin

;

carbohydrates

;

laboratory studies

;

experimental studies

;

Mots-clés français / French Keywords

Plantae

;

Spermatophyta

;

Gymnospermae

;

Coniferales

;

Pinaceae

;

Méthode IR

;

Transformation Fourier

;

Spectre RMN

;

Altération thermique

;

Echantillon

;

Cellulose

;

Déshydratation

;

Oxydation

;

Pouvoir réflecteur

;

Spectrométrie

;

Résonance magnétique nucléaire

;

Température

;

Sol

;

Carbone

;

Protéine

;

Combustion

;

Bois

;

Pinus

;

Composition chimique

;

Lipide

;

Lignine

;

Carbohydrate

;

Etude laboratoire

;

Etude expérimentale

;

Mots-clés espagnols / Spanish Keywords

Spermatophyta

;

Gymnospermae

;

Coniferales

;

Método IR

;

Espectro de RMN

;

Alteración térmica

;

Celulosa

;

Deshidratación

;

Oxidación

;

Poder reflector

;

Espectrometría

;

Resonancia magnética nuclear

;

Temperatura

;

Suelo

;

Carbono

;

Proteina

;

Combustión

;

Madera

;

Pinus

;

Lípido

;

Localisation / Location

INIST-CNRS, Cote INIST : 17824, 35400010470889.0040

Nº notice refdoc (ud4) : 13886996



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