Importância fitossociológica de um fragmento de floresta ombrófila densa no estado de Roraima, Brasil

Dionísio, Luiz Fernandes Silva; Filho, Osmar Serra Bonfim; Crivelli, Bruno Roberto de Souza; Gomes, Jefferson Peixoto; Oliveira, Marcelo Henrique Silva de; Carvalho, J. O. P. de

doi:10.18227/1982-8470ragro.v10i3.3381

Cited by 13 publications

(12 citation statements)

References 16 publications

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“…No presente estudo, a maioria dos indivíduos encontra-se no estrato médio, representando 71,7% do total. Esse resultado corrobora com Dionisio et al (2016) e Condé e Tonini (2013) que encontraram em cerca de 70% dos indivíduos ocorrendo na classe de altura média ao analisarem áreas florestais no estado de Roraima. Esses mesmos autores ressaltam que poucos indivíduos alcançam o dossel da floresta.…”

Section: Resultsunclassified

Estratificação Vertical Em Área De Coleta De Sementes Da Terra Indígena Parakanã, Estado Do Pará, Brasil

Leão¹,

Pereira²,

Felipe³

et al. 2019

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The study of the vertical stratification of the forest evidences the dominance of certain species in relation to the ecological behavior. Additionally, it can also support in the definition of climbing methods for harvesting fruits and seeds in the tree canopy. The present work aimed to analyze the vertical structure based on the individuals that compose the different botanical families in the Seed Collection Area (SCA) belong Parakanã Indigenous Land (PIL), Pará state. The height of 10,383 individuals present at ACS of T.I. Parakanã was determined by the visual estimation method. Subsequently, five height classes (superior class 1, superior 2, middle 1, middle 2 and inferior) were defined for the individuals' distribution. By the multivariate analysis the families were grouped by similarity equal to 70%. The results showed that the families Anacardiaceae, Fabaceae, Lauraceae, Lecythidaceae and Moraceae belong to the SCA canopy. The different botanical families formed six groups considering similarity equal to 70%. Group 1 and 2, with 29 families, constitute the superior stratum of the forest, however, also have individuals in the inferior classes; groups 3 and 4, with 14 families, constitute the intermediate canopy and sub-forest; group 5, equivalent to 7 families, is located 100% in the intermediate canopy, and, in relation to group 6, formed only by 2 families, the individuals are in the total sub-forest. The different strata observed in the SCA of PIL evidences the need to use different climbing methods to harvest fruits and seeds.

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Section: Resultsunclassified

Estratificação Vertical Em Área De Coleta De Sementes Da Terra Indígena Parakanã, Estado Do Pará, Brasil

Leão¹,

Pereira²,

Felipe³

et al. 2019

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“…In addition to presenting this characteristic in the winter months, TAF has a strong year-to-year variation in precipitation that can vary up to 50% (Garay et al 2003) and this climate type can experience precipitations below 25 mm monthly (Alvares et al 2014). Phytosociological studies where D. excelsa has a high value of importance (VI) present the climate in these regions according to Koppen as "Am," with annual rainfall of 1355 to 2839 mm (da Silva et al 2008;Dionisio et al 2016). In this climate type, the driest months present monthly precipitation above 25 mm (considering Alvares et al 2014).…”

Section: Discussionmentioning

confidence: 99%

Wood anatomy of the rare species Dinizia jueirana-facao (Fabaceae), “Tabuleiros” Atlantic Forest, Brazil

et al. 2019

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We present the first wood anatomy description for the rare species Dinizia jueirana-facao G. P. Lewis & G. S. Siqueira, which grows in a megadiverse tropical forest subjected to rainfall seasonality, in SE Brazil. Growth rings are visible to the naked eye and demarcated by thin marginal parenchyma bands and, sometimes, by thick-walled fibers in the latewood. Axial paratracheal parenchyma is vasicentric to lozenge aliform with short confluences. Rays are 2-6-seriate, homocellular (procumbent cells) and non-storied. Vessels are visible to the naked eye, some irregular clusters, with diffuse distribution, sometimes filled with gums. Crystals are absent. Intercellular canals of traumatic origin are present. In general, wood anatomical characteristics of D. jueirana-facao agree with those previously reported for other Mimosoid species. As other cooccurring Fabaceae, the studied species has visible growth rings, but more conspicuous than reported for its sister species. Growth rings in D. jueirana-facao are likely triggered by the marked rainfall seasonality.

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“…Brazil has approximately one third of the remaining rainforests of the world, but the impact of anthropic actions on the managed environments has affected important ecosystems (Dionisio et al, 2016;Dionisio et al, 2017), mainly due to the increase of deforestation rates in Brazilian Amazon (INPE, 2016). The search for sustainable production systems has been a fundamental element of strategies for the development of the Amazon region (Leão et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Litter flux in a successional forest ecosystem under nutrient manipulation in Eastern Amazon

Almeida

Oliveira

Vasconcelos

et al. 2019

BJD

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The aim of this work was to evaluate the dynamics of Ca and Mg cations, via litter, in a successional forest ecosystem, on the middle plateau of the Apeú river, in Castanhal, northeast of Pará (1º19' S, 47º57' W). The magnitude of this phenomenon can be explained by the functional role of the floristic structure, with dominant species, Myrcia sylvatica (G. mey) DC., Myrcia bracteata (Rich) DC., Miconia ciliata (Rich) DC., Lacistema pubescens Mart., Lacistema aggregatum (Berg.) Rusby, Vismia guianensis (Aubl.) Choisy, Cupania scrobiculata Rich. and Ocotea guianensis Aubl, which consisted in the determinant factors, associated to the natural hydroperiodic effect. The evaluation of analytical results, in litter removal treatment, of the mean mass of Ca ranged from 0.018 to 0.076 g m-2month-1, while Mg varied from 0.006 to 0.028 g m-2month-1, being significantly (P<0.05) different from control in treatment and time. However, the flux distribution was influenced by the Brazilian Journal of Development Braz. J. of Develop., Curitiba, v. 5, n. 12, p. 30623-30641, dec. 2019. ISSN 2525-8761 30624season, being higher in the dry period. The flux values of Ca (0.047 ± 0.015 g m-2month-1) were significantly higher (P<0.05) than those of Mg (0.015 ± 0.004 g m-2month-1), independently of the manipulation via treatment, phenomenon explained by the dynamics of Calcium in the biogeochemical cycle. RESUMOO objetivo deste trabalho foi avaliar a dinâmica de cátions Ca e Mg, via serapilheira, em um ecossistema florestal sucessional, no planalto médio do rio Apeú, em Castanhal, nordeste do Pará (1º19 'S, 47º57' W). A magnitude desse fenômeno pode ser explicada pelo papel funcional da estrutura florística, com espécies dominantes, Myrcia sylvatica (G. mey) DC., Myrcia bracteata (Rich) DC., Miconia ciliata (Rich) DC., Lacistema pubescens Mart ., Lacistema agregatum (Berg.) Rusby, Vismia guianensis (Aubl.) Choisy, Cupania scrobiculata Rich. e Ocotea guianensis Aubl, que consistiu nos fatores determinantes, associados ao efeito hidroperiódico natural. A avaliação dos resultados analíticos, no tratamento de remoção de serapilheira, da massa média de Ca variou de 0,018 a 0,076 g m-2 meses-1, enquanto o Mg variou de 0,006 a 0,028 g m-2 meses-1, sendo significativamente (P <0,05) diferente do controle no tratamento e no tempo. No entanto, a distribuição do fluxo foi influenciada pela estação, sendo maior no período seco. Os valores de fluxo de Ca (0,047 ± 0,015 g m-2 meses-1) foram significativamente maiores (P <0,05) do que os de Mg (0,015 ± 0,004 g m-2 meses-1), independentemente da manipulação por tratamento, fenômeno explicado por a dinâmica do cálcio no ciclo biogeoquímico.Palavras-chave: Amazônia Oriental, biogeoquímica, floresta secundária, remoção de serapilheira, serapilheira.

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Importância fitossociológica de um fragmento de floresta ombrófila densa no estado de Roraima, Brasil

Cited by 13 publications

References 16 publications

Estratificação Vertical Em Área De Coleta De Sementes Da Terra Indígena Parakanã, Estado Do Pará, Brasil

Estratificação Vertical Em Área De Coleta De Sementes Da Terra Indígena Parakanã, Estado Do Pará, Brasil

Wood anatomy of the rare species Dinizia jueirana-facao (Fabaceae), “Tabuleiros” Atlantic Forest, Brazil

Litter flux in a successional forest ecosystem under nutrient manipulation in Eastern Amazon

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