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	Provedor de dados Acta Amazonica (1) PAB (1) RChHN (1) Autor ARMBRÜSTER,Nicole (1) Dias-Filho,Moacyr Bernardino (1) JUNK,Wolfgang J. (1) LUSK,CHRISTOPHER H. (1) PAROLIN,Pia (1) Palavra-chave Leaf nitrogen (3) Amazonia (2) Araucaria araucana (1) Floodplain (1) Growth strategy (1) Ipomoea asarifolia (1) Leaf longevity (1) Photosynthesis (1) Podocarpus (1) Resource gradients (1) Specific leaf area (1) Stachytarpheta cayennensis (1) Várzea (1) Waterlogging (1) Mais... Tipo do documento Info:eu-repo/semantics/article (2) Journal article (1) Ano 2002 (1) 2001 (1) 1999 (1) País Brazil (2) Chile (1) Idioma Inglês (3)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 3 Primeira ... 1 ... Última Seasonal changes of leaf Nitrogen content in trees of Amazonian floodplains Acta Amazonica PAROLIN,Pia; ARMBRÜSTER,Nicole; JUNK,Wolfgang J.. In Amazonian floodplains the trees are exposed to extreme flooding of up to 230 days a year. Waterlogging of the roots and stems affects growth and metabolic activity of the trees. An increased leaf fall in the aquatic period and annual increment rings in the wood indicate periodical growth reductions. The present study aims at documenting seasonal changes of metabolism and vitality of adult trees in the annual cycle as expressed by changes of leaf nitrogen content. Leaves of six tree species common in floodplains in Central Amazonia and typical representants of different growth strategies were collected every month between May 1994 and June 1995 in the vicinity of Manaus, Brazil. Mean leaf nitrogen content varied between 1.3% and 3.2% in the non-flooded... Tipo: Info:eu-repo/semantics/article Palavras-chave: Leaf nitrogen; Growth strategy; Waterlogging; Várzea; Floodplain; Amazonia. Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672002000200231 Physiological responses of two tropical weeds to shade: II. Leaf gas exchange and nitrogen content PAB Dias-Filho,Moacyr Bernardino. Ipomoea asarifolia (Desr.) Roem. & Schultz (Convolvulaceae) and Stachytarpheta cayennensis (Rich) Vahl. (Verbenaceae), two weeds found in pastures and crop areas in the Brazilian Amazonia, Brazil, were grown in controlled environment cabinets under high (800-1000 µmol m-² s-¹) and low (200-350 µmol m-² s-¹) light regimes during a 40-day period. The objective was to determine the effect of shade on photosynthetic features and leaf nitrogen content of I. asarifolia and S. cayennensis. High-irradiance grown I. asarifolia leaves had significantly higher dark respiration and light saturated rates of photosynthesis than low-irradiance leaves. No significant differences for these traits, between treatments, were observed in S. cayennensis. Low-irradiance... Tipo: Info:eu-repo/semantics/article Palavras-chave: Photosynthesis; Leaf nitrogen; Amazonia; Ipomoea asarifolia; Stachytarpheta cayennensis. Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X1999000600005 Leaf life spans of some conifers of the temperate forests of South America RChHN LUSK,CHRISTOPHER H.. Interspecific variation in leaf life span has wide-ranging implications for plant species sorting on resource availability gradients, and for ecosystem processes such as nutrient cycling. Very little is known about leaf life spans of evergreen trees in the temperate forests of South America. Leaf life spans were estimated by static demographic methods, and associated leaf traits measured, for four conifers of this region. It was expected that leaf life span variation would correlate negatively with soil fertility of habitats normally occupied by each species. This prediction was upheld by the data. The mean leaf life span determined for Araucaria araucana (24 years) is among the highest figures reported for any plant species. This extreme leaf longevity... Tipo: Journal article Palavras-chave: Araucaria araucana; Leaf longevity; Leaf nitrogen; Podocarpus; Resource gradients; Specific leaf area. Ano: 2001 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000300017 Registros recuperados: 3 Primeira ... 1 ... Última

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