Consulta: creatorFacets:"Gonçalves,José Francisco de C."
Registros recuperados: 4
Data/hora: 01/06/2024 13:21:03

Eficiência no uso dos nutrientes por espécies pioneiras crescidas em pastagens degradadas na Amazônia central
Provedor de dados: 36
Autores: Silva,Carlos E. M.; Gonçalves,José Francisco de C.; Feldpausch,Ted R.; Luizão,Flávio J.; Morais,Ronaldo R.; Ribeiro,Glaudecy O.
Nas últimas décadas, considerável parcela da floresta amazônica tem sido transformada em pastagens que, em função da baixa fertilidade natural dos solos e do manejo deficiente, decrescem rapidamente em produtividade e são abandonadas, dando lugar a uma sucessão secundária arbórea adaptada à baixa disponibilidade de nutrientes. O objetivo deste estudo foi obter informações sobre a eficiência no uso dos nutrientes por espécies arbóreas freqüentes nesses ambientes degradados, após calagem e aplicação de fosfato. O experimento realizado numa área de sucessão secundária com seis anos de idade, consistiu na aplicação de quatro tratamentos: controle; aplicação de fósforo (P); aplicação de fósforo e calcário (P+Cal); e aplicação de fósforo, calcário e gesso...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Áreas degradadas; Sucessão secundária; Trocas gasosas; Calcário; Fósforo; Gesso.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672006000400011

Effects of light and temperature on isoprene emission at different leaf developmental stages of eschweilera coriacea in central Amazon
Provedor de dados: 36
Autores: Alves,Eliane Gomes; Harley,Peter; Gonçalves,José Francisco de C.; Moura,Carlos Eduardo da Silva; Jardine,Kolby.
Isoprene emission from plants accounts for about one third of annual global volatile organic compound emissions. The largest source of isoprene for the global atmosphere is the Amazon Basin. This study aimed to identify and quantify the isoprene emission and photosynthesis at different levels of light intensity and leaf temperature, in three phenological phases (young mature leaf, old mature leaf and senescent leaf) of Eschweilera coriacea (Matamatá verdadeira), the species with the widest distribution in the central Amazon. In situ photosynthesis and isoprene emission measurements showed that young mature leaf had the highest rates at all light intensities and leaf temperatures. Additionally, it was observed that isoprene emission capacity (Es) changed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Light response curve; Temperature response curve; Leaf phenology; Tropical species.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672014000100002

Nutritional status and specific leaf area of mahogany and tonka bean under two light environments
Provedor de dados: 36
Autores: Gonçalves,José Francisco de C.; Vieira,Gil; Marenco,Ricardo A.; Ferraz,João Baptista S.; Santos Junior,Ulysses Moreira dos; Barros,Francisco Cleber F.
Studies on nutritional status and leaf traits were carried out in two tropical tree species Swietenia macrophylla King (mahogany) and Dipetryx odorata Aubl. Willd. (tonka bean) planted under contrasting light environments in Presidente Figueiredo-AM, Brazil. Leaves of S. macrophylla and D. odorata were collected in three year-old trees grown under full sunlight (about 2000 µmol m-2 s-1) and natural shade under a closed canopy of Balsa-wood plantation (Ochroma pyramidale Cav. Ex. Lam.Urb) about 260 µmol m-2 s-1. The parameters analysed were leaf area (LA), leaf dry mass (LDM), specific leaf area (SLA) and leaf nutrient contents. It was observed that, S. macrophylla leaves grown under full sunlight showed LA 35% lower than those grown under shade. In D....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tropical species; Leaf traits; Nutrients; Forest succession.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672005000100004

Primary metabolism components of seeds from Brazilian Amazon tree species
Provedor de dados: 61
Autores: Gonçalves,José Francisco de C.; Fernandes,Andreia V.; Oliveira,Antonio Fernando M.; Rodrigues,Lílian F.; Marenco,Ricardo A.
The contents of the main components of the primary metabolism (soluble sugars, starch, proteins, oils, fatty acids) and minerals (P, Ca, Mg, K, Fe, Zn, Mn, Cu) were characterized in seeds of five Brazilian Amazon tree species (Andira parviflora, Bertholletia excelsa, Helicostylis tomentosa, Hymenaea parviflora, and Parkia pendula). Soluble sugar contents were high in P. pendula seeds (14 %), whereas starch predominated in A. parviflora seeds (58.7 %). A. parviflora and H. parviflora seeds were rich in proteins (35.1 % and 32.4 %, respectively). The oil contents ranged from 1.4 % in A. parviflora to 70.7 % in B. excelsa. Only B. excelsa and P. pendula seeds may be considered oilseeds, with 70.7 % and 28.4 % oil, respectively. The fatty acid compositions...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fatty acids; Minerals; Oils; Proteins; Soluble sugars; Starch.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202002000200009