Data/hora: 17/06/2024 04:37:01

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