Data/hora: 23/09/2024 12:00:12

Biblioteca(s): 	Embrapa Amazônia Oriental.	
Data corrente: 	25/06/2013	
Data da última atualização: 	07/11/2022	
Autoria: 	MARKEWITZ, D.; FIGUEIREDO, R. de O.; CARVALHO, C. J. R. de; DAVIDSON, E. A.	
Afiliação: 	DANIEL MARKEWITZ, Warnell School of Forestry and Natural Resources, The University of Georgia; RICARDO DE OLIVEIRA FIGUEIREDO, CNPMA; CLAUDIO JOSE REIS DE CARVALHO, CPATU; ERIC A. DAVIDSON, The Woods Hole Research Center.	
Título: 	Soil and tree response to P fertilization in a secondary tropical forest supported by an Oxisol.	
Ano de publicação: 	2012	
Fonte/Imprenta: 	Biology and Fertility of Soils, v. 48, n. 6, p. 665-678, Aug. 2012.	
DOI: 	10.1007/s00374-011-0659-9	
Idioma: 	Inglês	
Conteúdo: 	Abstract Mature tropical forests are considered to be P limited and to cycle P efficiently. Whether P limitations are significant in younger secondary tropical forests, how- ever, remains largely unexplored. This study evaluated P limitation by observing the P fertilizer response of a natu- rally regenerated 24-year-old forest and its soil. In February 1999, six 20×20-m plots were established in secondary forest in the Brazilian Amazon. After 1 year of pre- treatment tree measurements, 50 kg Pha-1 was applied in January 2000 and again in January 2001. Soil sorption of P was relatively low (~100 micrograms g-1) in the surface 0?20 cm while sorption increased to ~180 micrograms g-1 at 20?50 cm and approached ~500 micrograms g-1 for the 50- to 200-cm layers. Soil P in 0?10 cm, measured as sequentially extractable fractions (resin, HCO3-Pi, NaOH-Pi, NaOH-Po, and 1 M HCl), in- creased shortly after fertilization and could account for nearly all the 50 kg Pha-1 added at each date. During the following 6 years, soil P in fertilized plots declined in all pools other than resin P, and by June 2006, concentrations returned to pre-fertilization levels. Despite the increase in extractable P with fertilization, increased tree growth was not detected from stand age 25 to 31 years. It appears that during secondary forest succession at this site, the forest P cycle was conservative so as to maintain available P at a sufficient concentration to meet forest P demands.	
Palavras-Chave: 	Fracionamento de fósforo; Limitação de fósforo; Sorção de fósforo.	
Thesagro: 	Fertilidade do solo; Floresta secundária; Floresta tropical; Fósforo.	
Thesaurus Nal: 	Amazonia; phosphorus fertilizers; rain forests; secondary forests; soil fertility.	
Categoria do assunto: 	K Ciência Florestal e Produtos de Origem Vegetal	
Registro original: 	Embrapa Amazônia Oriental (CPATU)	
Exemplares: 	CPATU - (47789-1) - UPC - AP - DD -  -  -  - DIS