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Registros recuperados: 10
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Changes in tree species richness, stand structure and soil properties in a successional chronosequence in northern Chiloé Island, Chile RChHN
ARAVENA,JUAN C.; CARMONA,MARTÍN R.; PÉREZ,CECILIA A.; ARMESTO,JUAN J..
We studied a chronosequence of forest fragments in northern Chiloé Island, southern Chile, with the aim of assessing ecosystem recovery patterns following anthropogenic disturbance. Hypotheses regarding successional trends in tree species richness, the replacement of shade-intolerant by shade-tolerant species, and the impact of disturbance on soil properties were evaluated in nine forest stands. The chronosequence encompassed two early (minimum stand age <15 years), three mid-successional (30-60 years), three late-successional (129-134 years), and one old-growth stand (ca. 200 years). Stand ages were estimated by coring a minimum of 30 canopy trees in each stand. Early and mid-successional stands showed evidence of human disturbance by fire of moderate...
Tipo: Journal article Palavras-chave: Forest succession; Fire disturbance; Biodiversity; Shade tolerance; Forest dynamics.
Ano: 2002 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2002000200007
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Efeito do sombreamento sobre a sobrevivencia, morfologia e quimica da erva-mate. Repositório Alice
COELHO, G.C.; RACHWAL, M.; SCHNORRENBERGER, E.; SCHENKEL, E.P..
2000
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Erva-mate; Ilex paraguariensis; Sombreamento; Desenvolvimento; Shade tolerance; Yerba mate.
Ano: 2000 URL: http://www.alice.cnptia.embrapa.br/handle/doc/301997
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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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Início de florescimento, produção e valor nutritivo de gramíneas forrageiras tropicais sob condição de sombreamento natural. Repositório Alice
CARVALHO, M. M.; FREITAS, V. de P.; XAVIER, D. F..
Um experimento foi conduzido para estudar seis gramíneas forrageiras tropicais quanto ao seu valor nutritivo, florescimento, e produção de matéria seca quando sombreadas por árvores de angico-vermelho (Anadenanthera macrocarpa). Foram estudadas as gramíneas Brachiaria brizantha cv. Marandu, Panicum maximum cvs. Aruana, Makueni, Mombaça e Tanzânia e Cynodon dactylon cv. Tifton 68. O desempenho das gramíneas sob as árvores foi comparado com o obtido em área próxima, sem árvores (controle). O sombreamento retardou o início do florescimento de todas as gramíneas, em maior ou menor grau, dependendo da espécie. A produção de matéria seca das gramíneas foi reduzida pelo sombreamento, exceto no corte 3, no qual o crescimento nas áreas com e sem sombra não diferiu...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Matéria seca; Nitrogênio; Tolerância à sombra; Valor nutritivo; Dry matter; Nitrogen; Shade tolerance; Nutritive value.
Ano: 2002 URL: http://www.alice.cnptia.embrapa.br/handle/doc/107334
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Interactive tree and N supply effect on six C4 forage grasses productivity. Repositório Alice
PONTES, L. da S.; GIOSTRI, A.; BALDISSERA, T. C.; BARRO, R. S.; PORFIRIO-DA-SILVA, V.; VALENGA, J. C. S.; TYMOCZUK, C. B.; COPLA, J. F.; JESUS, R. A.; CARVALHO, P. C. F..
2012
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Integrated crop-livestock; Light interception; Shade tolerance; Understory; Sistema silvipastoril.
Ano: 2012 URL: http://www.alice.cnptia.embrapa.br/handle/doc/945489
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Juvenile dynamics of the endemic and rare Enterolobium glaziovii Benth. (Mimosaceae) around reproductive trees in the Atlantic forest, Brazil Rev. Bras. Bot.
Ramos,Flavio N.; Silvia-Matos,Dalva M.; Santos,Flavio A. Maës dos.
Studies on the regeneration and seedling mortality of rare tree species are important, but scarce. The aim of this study was to investigate the annual variation in recruitment, growth and mortality of juveniles of Enterolobium glaziovii Benth., a rare tree species from the Brazilian Atlantic Rain Forest. All seedlings and juveniles around four reproductive trees were labeled and their fate was followed from 1996 to 1999. There were no annual differences in juveniles' recruitment below and beyond the parental crown, but juveniles' survival and growth were lower below than beyond of the parental tree crowns. Small individuals (< 15 cm tall) showed the greatest mortality and the lowest growth, followed by medium (from 15 to 50 cm tall) and large ones (>...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Conspecific influence; Distance-dependent mortality; Growth; Shade tolerance; Size-dependent mortality.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042005000400011
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Leaf Morphological Plasticity of Tree Species from Two Developmental Stages in Araucaria Forest BABT
Vieira,Willyam de Lima; Boeger,Maria Regina Torres; Cosmo,Nelson Luiz; Coan,Alessandra Ike.
This study compared the morphological and anatomical variations of the leaves of four shade-tolerant tree species Allophylus edulis (St.-Hil.) Radlk (Sapindaceae), Casearia sylvestris Sw. (Salicaceae), Cupania vernalis Cambess. (Sapindaceae) and Luehea divaricata Mart. (Malvaceae) from a fragment of Araucaria forest in two developmental stages. Morphological and anatomical traits, such as leaf and tissue thickness, leaf area, leaf dry mass, specific leaf area, leaf density and stomata density were measured from 30 leaves of each developmental stage. The phenotypic plasticity index was also calculated for each quantitative trait. The results showed that the four species presented higher mean values ​​for specific leaf area and spongy/palisade parenchyma...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Leaf anatomy; Leaf morphology; Ombrophyllous Mist Forest; Shade tolerance.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132014000400476
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Leaf optical properties as affected by shade in saplings of six tropical tree species differing in successional status Braz. J. Plant Physiol.
Souza,Rogéria Pereira; Válio,Ivany F. M..
Tree species differing in successional status may present different responses to shade. Adjustments at leaf level may affect their optical properties, leading to changes in PAR (photosynthetically active radiation) absorbance. The aim of this study was to evaluate leaf optical properties as affected by understory shade in saplings of six tropical tree species differing in successional status and degree of shade tolerance. Chlorophyll content and specific leaf area (SLA) were also evaluated. The effects of shade on leaf optical properties and chlorophyll content differed among the studied species, whereas increased SLA was a common response for all species, reflecting the occurrence of thinner leaves under shade. The three studied shade-tolerant species -...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Chlorophyll; Leaf absorbance; Shade tolerance; Specific leaf area; Successional species.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202003000100007
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Patterns of tree seedling mortality in a temperate-mediterranean transition zone forest in Chile Gayana Botánica
PARADA,TERESA; LUSK,CHRISTOPHER H..
Seedling mortality in forests is the net result of an array of processes that vary spatially and temporally. We quantified emergence and mortality of seedlings at monthly intervals for two years, in a forest situated in the transition zone between the Mediterranean and temperate regions of Chile. We aimed to determine if survival of species responded differentially to seasonal water availability, to the spatial variation in light availability and to seedling density. The commonest species in the seedling bank were the Mediterranean-climate species Cryptocarya alba (61%) and the temperate-climate species Aextoxicon punctatum (29%). 279 of the 504 new seedlings that emerged during the two-year study died during the same period, corresponding to 55,4%...
Tipo: Journal article Palavras-chave: Aextoxicon punctatum; Cryptocarya alba; Density-dependent mortality; Drought tolerance; Shade tolerance.
Ano: 2011 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000200015
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Seedling growth of fifteen Brazilian tropical tree species differing in successional status Rev. Bras. Bot.
Souza,Rogéria P.; Válio,Ivany F.M..
Growth of seedlings of fifteen tropical tree species representative, at the adult stage, of different successional positions, was studied under field conditions. Seedlings were grown in three treatments: full sun (FS), artificial shade imposed by neutral screens (AS) and natural shade imposed by a closed canopy in a Forest Reserve in Southeast Brazil (NS). Most of the studied species survived in both shade treatments, although their growth was severely affected. Decreases in height, internode numbers, dry weight, leaf area, root:shoot ratio (R:S) and increases in leaf mass ratio (LMR), leaf area ratio (LAR) and specific leaf area (SLA) were common responses to shade. Relative growth rates (RGRs) and net assimilation rates (NARs) were consistently lower in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Seedling growth; Shade; Shade tolerance; Successional species; Tropical tree species.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042003000100005
Registros recuperados: 10
Primeira ... 1 ... Última
 

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