Data/hora: 02/06/2024 05:32:11

Biblioteca(s): | Embrapa Amazônia Ocidental; Embrapa Soja.
Data corrente: | 13/03/2014
Data da última atualização: | 09/11/2015
Autoria: | MOREIRA, A.; MORAES, L. A. C.; ZANINETTI, R. A.; CANIZELLA, B. T.
Afiliação: | ADÔNIS MOREIRA, CNPSO; LARISSA ALEXANDRA CARDOSO MORAES, CNPSO; REAN AUGUSTO ZANINETTI, UFAM; BRUNA TROVO CANIZELLA, UEL.
Título: | Phosphorus dynamics in the conversion of a secondary forest into a rubber tree plantation in the Amazon rainforest.
Ano de publicação: | 2013
Fonte/Imprenta: | Soil Science, v. 178, n. 11, p. 618-625, Nov. 2013.
ISSN: | 0038-072-5X
DOI: | 10.1097/SS.0000000000000025
Idioma: | Inglês
Conteúdo: | During the past several decades, extensive areas of the humid tropical Amazon have been cleared for the introduction of pasture or subsistence farming and later abandoned after a few years of use. An option for recovering these areas is the planting of rubber trees because it is a native tree that could restore conditions similar to those existing before the clearing. In addition, the high economic value of natural rubber is a source of income for small producers. In soil management under the Amazon conditions, low phosphorus (P) has been the most limiting factor. Under natural conditions, P is provided to the plants almost exclusively by organic matter mineralization. The aim of this study was to evaluate a chronosequence of reforestation with rubber trees planted at different times in cleared areas, with primary forest as a reference. The amounts of litter and P content in the plant, in the litter, and in soil, as well as biological indicators (acid and alkaline phosphatase and P microbial biomass) associated with the P cycle in a Xanthic Ferralsol (Oxisol), in the Central Amazon were assessed. Rubber tree growth resulted in changes in total organic carbon, with an increase of 104.6% in the 45-year-old rubber trees compared with the 6-year-old rubber tree plantation. This was also observed for acid and alkaline phosphatase activities, which were close to those of the primary forest. The formation of litter and the P content of the microbial biomass in soil were higher in rubber areas. The P immobilized into microbial biomass was the main reserve to meet the plant's nutritional demand for phosphorus. The content of P available in the soil, regardless of the extractants (Mehlich 1, Mehlich 3, and Bray 1) and the age of vegetation cover were below the levels indicated as appropriate.
Thesagro: | Hevea Brasiliensis; Seringueira.

Categoria do assunto:

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F Plantas e Produtos de Origem Vegetal

Registro original: | Embrapa Soja (CNPSO)

Exemplares:

CNPSO - (35085-1) - UPC - SP - PP - 12134 -  - 12134 - DIS
CPAA - (26894-1) - EMB - SP - PP - S1029 -  - S1029 - DIS