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Seasonal Patterns of Nitrogen and Phosphorus in the Litter and Soil Surface of Transitional Amazon Cerrado Forest, Brazil

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Journal of Environmental Science and Engineering 2011年第1期5卷 5-14页

作者： J. de S. Nogueira L. Sanches O.B. Pinto-Junior E.D. de Almeida Department of Physics Federal University of Mato Grosso Av. Fernando Correa da Costa 2367 Boa Esperanva Cuiaba MT 78060-900 Brazil Department of Sanitary and Environmental Engineering Federal University of Mato Grosso Av. Fernando Correa da Costa 2367 Boa Esperanca Cuiaba MT 78060-900 Brazil Department of Chemistry Federal Institute of Technological Education of Mato Grosso Rua Professora Zulmira Canavarros 95 Cuiabca MT 78005-200 Brazil

Measurements of litter production, and the surface litter pool were made over a 1 year period in a tropical transitional forest near Sinop, Mato Grosso Brazil with the aim of quantifying the seasonal variation of nitrogen and phosphorus in the litter and the annual contribution of nutrients to the soil. Average annual litterfall （＋95% confidence interval （CI）） was 8.20 ***^-1 year^-1 and forest floor litter mass was 58.63 ton＇hal. Nitrogen and phosphorus in the forest floor litter mass was highest during the dry and dry-wet season, being 38% higher than in the wet and wet-dry season. Seasonal variation in the litter and concentration of nutrients was explained by seasonal variations in the climate, for example in the precipition and soil humidity. Average annual nitrogen and phosphorus concentrations in the forest floor mass were 17.24 ***^-1 and 16.46 ***^-1, respectively. The more significant forest floor mass fraction for returning soil nutrients was the leaves. The concentration of nutrients was higher in the soil superficial layer （at depths between 0-5 cm） than at depths between 30-70 cm, approximately 83% and 93% for total nitrogen and available phosphorus, respectively.

关键词： Tropical forest litterpool nutrient cycling litterfall

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