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| Rolim,Samir Gonçalves; Couto,Hilton Thadeu Z. do; Jesus,Renato Moraes de; França,Jaime Tadeu. |
| Medidas precisas de volume de madeira são ferramentas importantes no planejamento do uso do recurso florestal. Neste estudo, foram investigados modelos volumétricos para a Floresta Nacional do Tapirapé-Aquirí, na Serra dos Carajás (PA), baseados numa cubagem rigorosa de 55 árvores para obter o diâmetro, altura comercial do fuste e volume sólido. Um total de 8 modelos de dupla entrada e 4 de simples entrada foram testados para o diâmetro mínimo de 14 cm. Para seleção do melhor modelo foram usadas as estatísticas do coeficiente de determinação, erro padrão da estimativa e distribuição dos resíduos. Entre os modelos de simples entrada o modelo logarítmico de Husch se ajustou melhor aos dados (R² = 0,9105) e entre os de dupla entrada o logarítmico de... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Equações de volume; Modelos logarítmicos; Manejo florestal; Floresta tropical; Carajás. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672006000100013 |
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| SILVA,MARCIO S. DA; GUIMARÃES,JOSÉ T.F.; SOUZA FILHO,PEDRO W.M.; NASCIMENTO JÚNIOR,WILSON; SAHOO,PRAFULLA K.; COSTA,FRANCISCO R. DA; SILVA JÚNIOR,RENATO O.; RODRIGUES,TARCÍSIO M.; COSTA,MARLENE F. DA. |
| ABSTRACT High-resolution satellite images, digital elevation models, bathymetric and sedimentological surveys coupled with statistical analysis were used to understand the physical environment and discuss their influence on water quality of the five upland lakes of Serra Sul dos Carajás, southeast Amazonia. The lakes have mid-altitude ranges (elevation), very small (catchment) and shallow to very shallow (central basins). Based on the length, area and volume, Violão and TI (Três Irmãs)-3 lakes may present large vertical movements of the water due to wind action and weakly stratified waters. Trophic conditions based on depth and shore development (Ld) parameters must be used with caution, since Amendoim Lake is relatively deep, but it is oligotrophic to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lateritic crust; Lakes; Limnology; Geomorphology; Amazon region; Carajás. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000401309 |
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| Nunes,Jaquelina A.; Schaefer,Carlos E.G.R.; Ferreira Júnior,Walnir G.; Neri,Andreza V.; Correa,Guilherme R.; Enright,Neal J.. |
| Vegetation and soil properties of an iron-rich canga (laterite) island on the largest outcrop of banded-iron formation in Serra de Carajás (eastern Amazonia, Brazil) were studied along a topographic gradient (738-762 m asl), and analyzed to test the hypothesis that soil chemical and physical attributes play a key role in the structure and floristic composition of these plant communities. Soil and vegetation were sampled in eight replicate plots within each of the four vegetation types. Surface (0-10 cm) soil samples from each plot were analyzed for basic cations, N, P and plant species density for all species was recorded. CCA ordination analysis showed a strong separation between forest and non-forest sites on the first axis, and between herbaceous and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Amazon Forest; Canga; Carajás; Ferruginous campo rupestre; Iron formation; Laterite. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000502097 |
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