Changes in the floristic composition of a Terra Firme rain forest In Brazilian Amazonia over an eight-year period In response to logging

Carvalho, J. O. P. de

doi:10.1590/1809-43922002322291

Cited by 10 publications

(3 citation statements)

References 13 publications

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“…Esse fato ocorreu, provavelmente, devido à exploração dessas florestas, o que causou sensíveis alterações na composição florística. Carvalho (2002), estudando mudanças na composição florística de uma área na Floresta Nacional do Tapajós, verificou que o número de espécies decresce imediatamente após a exploração. Porém, começa a crescer cinco anos depois e, no final de oito anos, foi maior do que antes da exploração.…”

Section: Resultsunclassified

Comparação entre florestas de várzea e de terra firme do Estado do Pará

Gama

Souza²,

Martins³

et al. 2005

Rev. Árvore

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Foram analisados agrupamentos florísticos entre comunidades arbóreas localizadas em diferentes locais do Estado do Pará, por meio de um banco de dados composto por 24 inventários em florestas de terra firme e 10 em floresta de várzea. Utilizaram-se o índice de Jaccard no cálculo da matriz de similaridade florística, que foi transformada em matriz de distância euclidiana, e o Método de Ward na definição dos grupos. Pelos resultados, foi possível concluir que as composições florísticas das florestas de várzea e terra firme são bem distintas. Poucas espécies ocorrem nos dois ecossistemas; a floresta de terra firme apresenta maior riqueza de espécies arbóreas que a floresta de várzea; houve tendência das florestas de terra firme em se agruparem mais pela situação antrópica e proximidade geográfica do que as florestas de várzea; em geral, as florestas agruparam-se em ordem decrescente de importância dos fatores: saturação hídrica do solo, situação antrópica e proximidade geográfica.

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Section: Resultsunclassified

Comparação entre florestas de várzea e de terra firme do Estado do Pará

Gama

Souza²,

Martins³

et al. 2005

Rev. Árvore

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“…The original vegetation in the study area is dense ombrophilous forest (Carvalho, 2002), which is the predominant forest typology in the Tapajós National Forest, characterized by the presence of large trees (DBH > 60cm) and uniform canopy (Gonçalves & Santos, 2008) 200ha forest management unit located in the north portion of this study, since they did not have enough plots reached by the accidental fire (details about this fire are given ahead) to permit comparisons within treatments (Bonar et al, 2011). Thus, only the history of T2 and T4 treatments are detailed in Table 1.…”

Section: Study Areamentioning

confidence: 99%

Fire Compromises the Recovery of a Managed Forest in Tapajós National Forest, Eastern Amazon, Brazil

Andrade¹,

Ruschel

Schwartz

et al. 2022

BioBrasil

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Logged forests are more prone to fire, shifts in species composition, and losses in biodiversity. In this work changes in the horizontal structure and species composition of a managed forest in the Tapajós National Forest, Eastern Amazon, Brazil, along 31 years (1981-2012) was evaluated. The disturbances included logging (1982), thinning of non-commercial species (1993/1994), and fire (1997). Data were obtained in 36 0.25-ha permanent plots split in 12 plots per each one of three harvesting treatments. In 1997, 16 plots were reached by an accidental superficial fire. The changes in species composition and diversity between the last measurement after logging and before fire (1995) and the last measurement (2012) were compared. PERMANOVA, considering the relationship between the NMDS axes and the treatment variable (logging / control + unburnt / burnt) differed in species composition, among treatments before fire (1995) and 15 years after fire (2012). The post-hoc test for PERMANOVA showed great similarity among logged forests before and after fire. The forest pre-disturbance conditions were important drivers in forest recovery, since logged forests under heavy thinning presented more losses in basal area and alterations in species composition. Therefore, stronger and more frequent disturbances can compromise the forest resilience.

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“…The experimental area represents a typical dense ombrophylous forest of the region, with no history of forest exploitation (Carvalho 2002, characterized by the dominance of large arboreal individuals and by the abundance of woody lianas, palms and epiphytes, with a uniform canopy or with emergent trees (Gonçalves and Santos 2008).…”

Section: Area Of Studymentioning

confidence: 99%

Post-fire recovery of a dense ombrophylous forest in Amazon

Andrade

Gama

Ruschel³

et al. 2019

An. Acad. Bras. Ciênc.

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The fires that occur in the Amazon are as damaging as the deforestation is. There is a need for further long-term studies on dynamics of tree communities in forests affected by fires. In the present study we evaluated the dynamics of tree species, before and after an accidental fire that occurred in 1997 in an experimental area of terra firme forest in the Floresta Nacional do Tapajós, in western Pará State, Brazil. Approximately 3500 trees with diameter measured at 1.30 m above ground (DBH) ≥ 5 cm were botanically identified and measured in 12 permanent plots of 0.25 ha (50 m x 50 m), in 1983, 1987, 1989, 1995, 2008 and 2012. Analyses of survival, mortality and recruitment of trees were performed. The results showed that although the fire has increased the mortality and recruitment rates after 15 years, the highest mortality occurred on trees with smaller diameters (DBH < 30 cm), so the fire did not affect the survival of large trees in the long term, explaining why the reduction in density of living trees has not greatly influenced the decrease in basal area in the burned forest.

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Changes in the floristic composition of a Terra Firme rain forest In Brazilian Amazonia over an eight-year period In response to logging

Cited by 10 publications

References 13 publications

Comparação entre florestas de várzea e de terra firme do Estado do Pará

Comparação entre florestas de várzea e de terra firme do Estado do Pará

Fire Compromises the Recovery of a Managed Forest in Tapajós National Forest, Eastern Amazon, Brazil

Post-fire recovery of a dense ombrophylous forest in Amazon

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