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• W1978999684 abstract "The transformation of native Cerrado into Pinus caribaea Morelet plantations changes the DOM dynamics including changed rates of mineralisation, denitrification, and C export to the groundwater. To examine the differences in quantity, temporal dynamics, and quality of DOM between Cerrado and Pine plantations we collected rainfall, throughfall, stemflow, litter leachate (under pine only) and soil solution at 15, 80, and 200 cm depth in weekly intervals during the rainy seasons 1997/98 and 1998/99. We determined total dissolved organic carbon (DOC) concentrations and assessed DOM quality by separating hydrophilic and hydrophobic fractions and by NMR analysis of organic layer extracts. The rainfall had a mean DOC concentration of 2.6 mg L−1. The mean concentrations of DOC in the throughfall of the pine plantations (5.0–10.5 mg L−1) were significantly above those of Cerrado (2.6–4.9 mg L−1). During the first part of the rainy seasons (October–December), the concentrations of DOC in the soil solution (15–200 cm depth) under Cerrado and pine did not differ significantly. During the second part of both rainy seasons (January–April), the concentrations of DOC in the soil solution under Cerrado (4.4–5.1 mg L−1) exceeded those under PI (1.4–2.7 mg L−1). Possible explanations of the latter include higher DOM input into the Cerrado soil and a stronger retention and/or faster mineralisation of the pine DOM than of the Cerrado DOM in the mineral soil. As the structural composition of DOM extracted from the organic layer under Cerrado and pine did not differ significantly, faster mineralisation was the most likely explanation for partly lower DOC concentrations in the soil solution under pine than under Cerrado. This assumption was supported by increasing contributions of hydrophobic DOM to total DOM with increasing depth under pine while, under Cerrado, the DOM composition did not change with depth. The reason for DOM mineralisation under pine was probably the higher N availability because total N concentrations were 11–23 times higher under pine than under Cerrado." @default.
• W1978999684 created "2016-06-24" @default.
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• W1978999684 date "2004-02-01" @default.
• W1978999684 modified "2023-10-04" @default.
• W1978999684 title "Dissolved organic matter under native Cerrado and Pinus caribaea plantations in the Brazilian savanna" @default.
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• W1978999684 doi "https://doi.org/10.1023/b:biog.0000015281.74705.f8" @default.
• W1978999684 hasPublicationYear "2004" @default.
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