Data/hora: 17/06/2024 08:38:58

Biblioteca(s): | Embrapa Amazônia Oriental.
Data corrente: | 21/06/2001
Data da última atualização: | 06/12/2022
Autoria: | SÁ, T. D. de A.; OLIVEIRA, V. C. de; ARAUJO, A. C. de; BRIENZA JUNIOR, S.
Afiliação: | TATIANA DEANE DE ABREU SA, CPATU; CPATU/CNPQ; ALESSANDRO CARIOCA DE ARAUJO, BOLSISTA CPATU / CNPQ / FCAP; SILVIO BRIENZA JUNIOR, CPATU.
Título: | Spectral irradiance and stomatal conductance of enriched fallows with fast-growing trees in eastern Amazonia, Brazil.
Ano de publicação: | 1999
Fonte/Imprenta: | Agroforestry Systems, v. 47, n. 1, p. 289-303, 1999.
Descrição Física: | il.
DOI: | 10.1023/A:1006240102207
Idioma: | Inglês
Conteúdo: | The biomass production of both indigenous and introduced plant species in tropical fallow systems depends on the degree to which these species can acclimate to the light and water environments. Results for light spectral composition monitoring within the canopy of enriched fallows and for the leaf stomatal conductance of fast-growing leguminous trees and indigenous fallow species are presented. All measurements were made in a smallholder farm in Igarapé-Açu, northeastern Pará State, Brazil. Light spectral composition (330 to 1100 nm) was monitored at two heights (ground level and 1 m) in a six-year-old natural fallow, 1.5-year-old natural fallow, and 1.5-year-old fallows enriched with Acacia angustissima, Acacia mangium, Clitoria racemosa, Inga edulis, Sclerolobium paniculatum, and a mixture of these trees. Light-quality parameters including photosynthetically active radiation, phytochrome active radiation, and blue active radiation changed most drastically in the stands enriched with A. mangium. Stomatal conductance was higher for A. mangium than the other trees and four common indigenous fallow vegetation species (Phenakospermum guyannense, Davilla rugosa, Lacistema pubescens, and Myrcia bracteata). Results suggest that the enrichment of fallows with A. mangium may promote changes in light and water vapor exchange regimes, with potential effects on species diversity in fallows.
Thesagro: | Cultivo Migratório; Disponibilidade de Nutriente; Fixação de Nitrogênio; Pousio; Radiação Solar.
Thesaurus Nal: | fallow; nitrogen fixation; nutrient availability; shifting cultivation; solar radiation.
Categoria do assunto: | --
Registro original: | Embrapa Amazônia Oriental (CPATU)
Exemplares: | CPATU - (29767-1) - UPC - AP - DD -  -  -  - DIS