Impact of expected global warming on C mineralization in maritime Antarctic soils: results of laboratory experiments

dc.creatorCarvalho, Juliana Vanir de Souza
dc.creatorMendonça, Eduardo de Sá
dc.creatorBarbosa, Rui Tarcísio
dc.creatorReis, Efrain Lázaro
dc.creatorSeabra, Paulo Negrais
dc.creatorSchaefer, Carlos Ernesto G.R.
dc.date2018-08-22T16:36:25Z
dc.date2018-08-22T16:36:25Z
dc.date2010-07-02
dc.date.accessioned2023-09-27T20:56:06Z
dc.date.available2023-09-27T20:56:06Z
dc.identifier13652079
dc.identifierhttps://doi.org/10.1017/S0954102010000258
dc.identifierhttp://www.locus.ufv.br/handle/123456789/21304
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/8951180
dc.descriptionThis study concerned the fragility of maritime Antarctic soils under increasing temperature, using the C dynamics and structural characteristics of humic substances as indicators. Working with four representative soils from King George Island (Lithic Thiomorphic Cryosol (LTC1 and LTC2), Ornithogenic Cryosol (OG) and Gelic Organosol (ORG)) we evaluated the total organic C and nitrogen contents, the oxidizable C and humic substances. Soil samples were incubated to assess the amount of C potentially mineralizable at temperatures typical of an Antarctic summer (5–148C). Humic acids showed a higher aliphatic character and a smaller number of condensed aromatic groups, which suggests that these molecules from Antarctic soils are generally less resistant to microbial degradation than humic acids molecules from other regions. Based on 13 C NMR spectra of MAS and CP/MAS, samples of soil humic acids of mineral soils (LTC1 and LTC2) have a higher content of aliphatic C, and heteroatom C, with lower levels of carbonyl and aromatic C, when compared with organic matter-rich soils (OG and ORG). Increasing incubation temperature led to a higher rate of mineralizable C in all soils. A sequence of soil fragility was suggested - LTC1 and LTC2 . OG . ORG - which showed a correlation with the Q10 coefficient and the ratio of labile and recalcitrant C fractions of soil organic matter (R 2 5 0.83).
dc.formatpdf
dc.formatapplication/pdf
dc.languageeng
dc.publisherAntarctic Science
dc.relationv. 22, n. 5, p. 485-493, october 2010
dc.rightsAntarctic Science Ltd
dc.subjectHumic substances
dc.subjectOrganic matter
dc.subjectSoil organic matter fragility
dc.subjectSouth Shetland Islands
dc.titleImpact of expected global warming on C mineralization in maritime Antarctic soils: results of laboratory experiments
dc.typeArtigo


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