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| 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 |
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| 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 |
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| 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 |
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| 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 |
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