Loss and gain of carbon during char degradation

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dc.contributor.authorBird, MIen_AU
dc.contributor.authorMcBeath, AVen_AU
dc.contributor.authorAscough, PLen_AU
dc.contributor.authorLevchenko, VAen_AU
dc.contributor.authorWurster, CMen_AU
dc.contributor.authorMunksgaard, NCen_AU
dc.contributor.authorSmernik, RJen_AU
dc.contributor.authorWilliams, AAen_AU
dc.date.accessioned2017-06-23T01:56:55Zen_AU
dc.date.available2017-06-23T01:56:55Zen_AU
dc.date.issued2017-03-01en_AU
dc.date.statistics2017-06-23en_AU
dc.description.abstractWe report results of a study examining controls on the degradation of chars produced at 300, 400 and 500 °C from radiocarbon-free wood, deployed for three years in a humid tropical rainforest soil in north Queensland, Australia. The chars were subjected to four treatments (i) no litter (ii) covered by leaf litter, (iii) covered by limestone chips to alter local pH, and (iv) covered by limestone chips mixed with leaf litter. Radiocarbon, stable isotope and proximate analyses indicate significant ingress of exogenous (environmental) carbon and mineral material, strongly correlated with loss of indigenous (char) carbon from the samples. While indigenous carbon losses over three years were generally <8% for the char produced at 500 °C char under any treatment, chars formed at lower temperatures lost 5–22% of indigenous carbon accompanied by ingress of up to 7.5% modern exogenous carbon. The data provide clear evidence of a direct link between the ingress of exogenous carbon, likely at least partly due to microbial colonization, and the extent of char decomposition. Failure to account for the ingress of exogenous carbon will lead to a significant under-estimate of the rate of char degradation. © 2016, Elsevier Ltd.en_AU
dc.identifier.citationBird, M. I., Mcbeath, A. V., Ascoughm P. L., Levchenko, V. A., Wurstera. C. M., Munksgaarda, N. C., Smernik, R. J., & Williams, A. (2017). Loss and gain of carbon during char degradation. Soil Biology and Biochemistry, 106: 80-89. doi:10.1016/j.soilbio.2016.12.012en_AU
dc.identifier.govdoc8264en_AU
dc.identifier.issn0038-0717en_AU
dc.identifier.journaltitleSoil Biology and Biochemistryen_AU
dc.identifier.pagination80-89en_AU
dc.identifier.urihttps://doi.org/10.1016/j.soilbio.2016.12.012en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/8778en_AU
dc.identifier.volume106en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectCarbon sequestrationen_AU
dc.subjectCharsen_AU
dc.subjectLimestoneen_AU
dc.subjectStable isotopesen_AU
dc.subjectDecompositionen_AU
dc.subjectQueenslanden_AU
dc.titleLoss and gain of carbon during char degradationen_AU
dc.typeJournal Articleen_AU
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