Use este identificador para citar ou linkar para este item: https://repositorio.inpa.gov.br/handle/1/14070
Título: Nutrients in soil solution in an upland forest submitted to selective logging in central Amazonia
Título(s) alternativo(s): Nutrientes na solução do solo em floresta de terra firme na Amazônia Central submetida à extração seletiva de madeira
Autor: Ferreira, Sávio José Filgueiras
Luizão, Flávio Jesus
Miranda, Sebastião Átila Fonseca
Silva, Maria do Socorro Rocha da
Vital, Ana Rosa Tundis
Data do documento: 2006
Revista: Acta Amazonica
É parte de: Volume 36, Número 1, Pags. 59-68
Abstract: The nutrients NO 3 -, NH 4 +, K +, Ca 2+, Mg 2+ and Na + were determined in a soil solution in a layer 0-30 cm, in an area submitted to selective logging (6-10 trees or 34 m 3 ha -1 of timber), located 80 km north of Manaus. The experiment was made up of three blocks, each containing one control plot and one plot submitted to selective logging. The soil in the area is very clayey Alic Yellow Latosol, with a high clay content. The samples were collected and analysed during 13 months in five treatments: control (pristine forest), centre of the clear-cut, edge of the clear-cut, edge of the remaining forest and remaining forest. Calcium, magnesium, potassium and sodium concentrations showed significant differences among the different treatment. Nitrate and ammonium ions were the less affected concentrations. In the treatments centre of the clear-cut and edge of the clear-cut, the nutrient results were, mostly, the highest values. The greatest difference occurred in the sodium concentration in the soil solution, which reached 5 kg/ha, in the centre of clear-cut of Blocks I and II, being practically twice as much as the values found on their respective control plots. The lowest concentrations of the nutrients in the soil solution on the pristine forest (control plot) and in the remaining forest confirm the efficiency of the forest in nutrient cycling. The higher concentration values of these nutrients in the centre of the clearcut, might be possibly due to the removal of trees, availability of easily decomposable materials like dead roots and accumulated litter.
DOI: 10.1590/S0044-59672006000100008
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