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Effects of light availability and growth rate on leaf lifespan of four temperate rainforest Proteaceae RChHN
LUSK,CHRISTOPHER H; CORCUERA,LUIS J.
Although comparative studies have revealed much about the environmental correlates of leaf lifespan and its integration with other leaf traits, a comprehensive theory of leaf lifespan is still lacking. The influence of growth rate on self-shading may be a key proximate determinant of both inter- and intra-specific variation in leaf lifespans. If this were the case, we would expect leaf lifespans of fast-growing light-demanding species to respond more strongly to light environment than those of shade-tolerant species. We monitored growth and leaf survival of juvenile trees of four temperate rainforest Proteaceae in southern Chile, in order to explore the influences of light environment and self-shading on leaf lifespan. Leaf lifespans tended to decrease...
Tipo: Journal article Palavras-chave: Height growth; LAI-2000; Path analysis; Self-shading; Shade tolerance.
Ano: 2011 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2011000200011
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Improved tree height estimation of secondary forests in the Brazilian Amazon Acta Amazonica
CASSOL,Henrique Luis Godinho; SHIMABUKURO,Yosio Edemir; CARREIRAS,João Manuel de Brito; MORAES,Elisabete Caria.
ABSTRACT This paper presents a novel approach for estimating the height of individual trees in secondary forests at two study sites: Manaus (central Amazon) and Santarém (eastern Amazon) in the Brazilian Amazon region. The approach consists of adjusting tree height-diameter at breast height (H:DBH) models in each study site by ecological species groups: pioneers, early secondary, and late secondary. Overall, the DBH and corresponding height (H) of 1,178 individual trees were measured during two field campaigns: August 2014 in Manaus and September 2015 in Santarém. We tested the five most commonly used log-linear and nonlinear H:DBH models, as determined by the available literature. The hyperbolic model: H = a.DBH/(b+DBH) was found to present the best fit...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Tree height-diameter (H:DBH) model; Nested model; Indicative variable; Height growth; Ecological species groups.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672018000300179
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Effects of experimental lightgaps and topography on enrichment plantings in a central Amazonian secondary forest Acta Amazonica
BENTOS,Tony Vizcarra; NASCIMENTO,Henrique E. M.; VIZCARRA,Marisângela dos Anjos; WILLIAMSON,G. Bruce.
ABSTRACT Enrichment plantings into secondary forest are an important option in restoring species diversity and ecosystem services. However, little attention has been given to environmental requirements for species performance. This study evaluated the effects of lightgaps and topographic position on the growth and survival of four native tree species (Pouteria caimito, Garcinia macrophylla, Dipteryx odorata and Cynometra bauhiniaefolia) planted into a 26-year old secondary forest originating from abandoned pastures in the central Amazon Basin. Artificial lightgaps and control plots under closed canopy were uniformly distributed on plateaus and bottomlands near water bodies. Seedlings were planted randomly into the plots and monitored for 28 months....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Abandoned pastures; Environmental conditions; Height growth; Light availability.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672020000300192
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