Consulta: subjectFacets:"Tropical trees"
Registros recuperados: 6
Data/hora: 12/06/2024 14:29:45

Estimación de volumen, biomasa y carbono aéreo en tres especies arbóreas de Pluma Hidalgo, Oaxaca.
Provedor de dados: 32
Autores: Aquino Ramírez, Martín.
Los reservorios y el potencial de almacenamiento de la cantidad biomasa y carbono se desconocen en la mayoría de los bosques tropicales de México, por lo que es importante realizar estimaciones precisas mediante el desarrollo de ecuaciones alométricas para conocer su variación espacial y temporal presente en los ecosistemas forestales. El presente estudio se realizó en el municipio de Pluma Hidalgo, Oaxaca, México, perteneciente a la región fisiográfica de la Sierra Madre del Sur, con el objetivo de desarrollar ecuaciones para estimar volumen comercial, biomasa y carbono aéreo total en las especies Cupania dentata DC., Alchornea latifolia Sw. e Inga punctata Willd. Se aplicó un muestreo destructivo a 48 árboles de los que se obtuvieron muestras de los...
Palavras-chave: Árboles tropicales; Análisis de regresión; Variable indicadora; Ecuaciones alométricas; Concentración de carbono; Tropical trees; Regression analysis; Indicator variable; Allometric equations; Carbon concentration; Ciencias Forestales; Maestría.
Ano: 2014
URL: http://hdl.handle.net/10521/2333

Age and Growth Rhythm of Tree Species Natural From Pantanal Matogrossense, MS
Provedor de dados: 190
Autores: Mattos, Patricia Póvoa de; Seitz, Rudi Arno; Salis, Suzana Maria de.
The information on the influence of environmental factors upon growth rate of trees is very important for the development of forestry management programs. The aim of this work was to determine the age and  radial increments of the trees. Samples were collected, in July 1996, in Nhumirim Farm, Embrapa Pantanal, located in Nhecolândia sub-region, Pantanal, Corumbá - Mato Grosso do Sul. The disks from 19 trees species were collected in areas with Arboreous Savanna, Forested Savana and Semi-deciduous Dry Forest. The  trees were selected by good canopy formation. Traversal section samples of the stem were collected of each tree at 0.3 m height, to determinate age and  increment of the first five years of the trees, and at  1,30m height, to evaluate the growth...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dendrochronology; Tropical trees; Diameter increment; Growth rings Dendrocronologia; Árvores tropicais; Incremento diamétrico; Anéis de crescimento.
Ano: 2011
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/241

Metabolismo respiratório de raízes de espécies arbóreas tropicais submetidas à inundação
Provedor de dados: 88
Autores: ROGGE,G.D.; PIMENTA,J.A.; BIANCHINI,E.; MEDRI,M.E.; COLLI,S.; ALVES,L.M.T.
Visando elucidar alguns aspectos do metabolismo respiratório de raízes inundadas de espécies arbóreas tropicais tolerantes (L. muehlbergianus, S.commersoniana e S. virgata) e intolerantes (P. dubium e S. terebinthifolius), plantas foram submetidas a 2, 10 e 60 dias de alagamento. Após estes períodos, determinou-se a absorção de O2 e liberação de CO2 pelas raízes. O metabolismo respiratório das raízes de espécies tolerantes apresentou uma queda com o alagamento. Somente S. commersoniana apresentou uma recuperação da respiração após 60 dias de inundação. A espécie intolerante S. terebinthifolius não teve seu metabolismo aeróbico afetado pelo alagamento, enquanto que P. dubium, também intolerante, apresentou queda na absorção de O2 com dois dias de hipoxia e...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Respiration; Flood tolerance; Tropical trees.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84041998000200007

Arbuscular mycorrhizal fungi associated with the rhizosphere of seedlings and mature trees of Swietenia macrophylla (Magnoliophyta: Meliaceae) in Los Tuxtlas, Veracruz, Mexico
Provedor de dados: 97
Autores: Rodríguez-Morelos,Víctor H; Soto-Estrada,Alejandra; Pérez-Moreno,Jesús; Franco-Ramírez,Alicia; Díaz-Rivera,Pablo.
BACKGROUND: Big-leaf mahogany (Swietenia macrophylla King) is the woody species with the highest economic value in Latin America. Currently, it is subject to intensive exploitation, diminishing its natural populations. Due to this decline, the species is a preferred species for reforestation and establishment of commercial tropical plantations. Mycorrhizal symbiosis is a biotic factor scarcely studied in the ecology of this species. Therefore, the objective of this research was to identify the diversity of arbuscular mycorrhizal fungi (AMF) species associated with the rhizosphere of seedlings and mature trees of big-leaf mahogany growing in its natural habitat, a tropical rain forest in Los Tuxtlas, Veracruz, Mexico. Soil samples from a 20-cm depth were...
Tipo: Journal article
Palavras-chave: Arbuscular mycorrhizae; Morphospecies; Seedlings; Spores; Tropical trees.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2014000100009

Seed size influence on germination responses to light and temperature of seven pioneer tree species from the Central Amazon
Provedor de dados: 42
Autores: Aud,Fabiana F.; Ferraz,Isolde D.K.
In Amazon secondary forests are dominated by pioneer species that typically produce large amounts of small and dormant seeds that are able to form a persistent soil seed bank. Seed dormancy in this group of species is overcome by environmental conditions found in open areas, such as high irradiation or alternating temperatures. Nevertheless, a variety of germination responses to environmental factors is known among pioneers; some of them may germinate in diffuse light or in darkness condition at constant temperature. Seed mass can be considered as one of the factors that promotes this variety. Regarding species with very small seeds, it seems that the trigger for germination is light and for larger seeds temperature alternation may be a more important...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Alternating temperatures; Germinability; Mean germination time; Photoblastic germination; Secondary forests; Tropical trees.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000300018

Leaf anatomy changes related to physiological adaptations to flooding in Amazonian tree species
Provedor de dados: 61
Autores: Herrera,Ana; Escala,Marcia; Rengifo,Elizabeth.
In trees of the seasonally flooded forest of the Mapire River in Venezuela, early flooding induces a reversible diminution in leaf conductance and photosynthetic rate. With the aim of finding an anatomical explanation for the observed responses of leaf gas exchange, the characteristics of emerged leaves developed under drainage or after three months of flooding were examined in the tree species Acosmium nitens, Campsiandra laurifolia, Duroia fusifera, Eschweilera tenuifolia, Pouteria orinocoensis and Symmeria paniculata and in leaves developed only under flooding in Inga spuria and Tachigali davidsei. Anatomy was remarkably similar among species and families and consisted of a bi-layered palisade parenchyma, a 5-6-cell-thick spongy parenchyma and large...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Flooding; Palisade; Parenchyma; Sclerenchyma; Spongy; Stomata; Tropical trees.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202009000400006