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Mineralization of soil organic matter from equatorial giant podzols submitted to drier pedoclimate: A drainage topochronosequence study

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Autor(es):
Montes, Celia R. ; Merdy, Patricia ; da Silva, Wilson T. L. ; Ishida, Debora ; Melfi, Adopho J. ; Santin, Roberta C. ; Lucas, Yves
Número total de Autores: 7
Tipo de documento: Artigo Científico
Fonte: CATENA; v. 222, p. 10-pg., 2022-12-08.
Resumo

Podzol soils are an important carbon pool in the Amazon, due to the high organic matter (OM) content in their topsoil horizons and deep Bh. To quantify the evolution of the stock and the lability of this carbon pool in the hypothesis of the onset of drier climates, we studied a soil toposequence at the end of which the incision of a river meander lowered the water table, as would result from a drier climate, allowing oxidation the Bh horizons. The soil OM was quantified and characterized (physical fractionation, humification indexes, 14C average age) and its lability under oxic conditions was estimated by measuring respiration during a 660-days experiment. Podzol genesis time was calculated by constraining the carbon fluxes using both C stock and 14C average age. The results confirmed that the studied podzols store large amounts of carbon (62.8 kgC m- 2 on average). They resulted from a long genesis time, probably greater than 30-50 ky. Topsoil OM is very labile with a residence time of about 100 y; Bh OM is highly humified with a high C/N (62.7 on average) related to low respiration rates. The measured respiration rates were used to estimate the C emission that would result from drier climates at 55 gC m- 2 y-1 on average during the first 100 y, which would correspond, by extrapolation, to 8.5 1012 gC y-1 for all Amazonian podzols. (AU)

Processo FAPESP: 12/51469-6 - Modelling the dynamics of equatorial forest soil deep carbon in changing environments - C-PROFOR
Beneficiário:Adolpho José Melfi
Modalidade de apoio: Auxílio à Pesquisa - Temático
Processo FAPESP: 11/03250-2 - Quantificação e dinâmica do carbono associado a horizontes espódicos profundos de solos da Floresta Amazônica, face a possíveis mudanças climáticas
Beneficiário:Célia Regina Montes
Modalidade de apoio: Auxílio à Pesquisa - Regular
Processo FAPESP: 12/18092-6 - Estimativa do estoque de carbono e sua sensibilidade à mineralização em horizontes espódicos profundos em Espodossolos da alta bacia do Rio Negro
Beneficiário:Roberta Clemente Santin
Modalidade de apoio: Bolsas no Brasil - Doutorado