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

作　　者：J. de S. Nogueira L. Sanches O.B. Pinto-Junior E.D. de Almeida 

机构地区：[1]Department of Physics, Federal University of Mato Grosso, Av. Fernando Correa da Costa, 2367, Boa Esperanva, Cuiaba, MT, 78060-900 Brazil [2]Department of Sanitary and Environmental Engineering, Federal University of Mato Grosso, Av. Fernando Correa da Costa, 2367, Boa Esperanca, Cuiaba, MT, 78060-900 Brazil [3]Department of Chemistry, Federal Institute of Technological Education of Mato Grosso, Rua Professora Zulmira Canavarros, 95, Cuiabca, MT, 78005-200 Brazil

出　　处：《Journal of Environmental Science and Engineering》2011年第1期5-14,共10页环境科学与工程（英文版）

摘　　要：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 ton.ha^-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 ton.ha^-1 and 16.46 ton.ha^-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 

分 类 号：S718.5[农业科学—林学] S714.8