Análise da estrutura e do estoque de fitomassa de uma floresta secundária da região de Manaus AM, dez anos após corte raso seguido de fogo

Lima, Adriano José Nogueira; Teixeira, Liliane Martins; Carneiro, Vilany Matilla Colares; Santos, Joaquim dos; Higuchi, Níro

doi:10.1590/s0044-59672007000100005

Cited by 18 publications

(13 citation statements)

References 9 publications

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“…the fraction of trees killed by wind (Table 2). In heavily damaged areas with the highest estimated mortality rates, structural measures were lower than the early-successional stages found in other nearby and smaller disturbed forest patches [89] and anthropogenic disturbances in the same forest type [41], [90]. At these sites, forest recovery will depend on species responses to the light gradient in gaps, which was supported for our results related to the third and fourth questions.…”

Section: Discussionsupporting

confidence: 84%

“…Our results add new and complementary information about succession and turnover of Western and Central Amazon forests and reinforce that recovery processes for large gaps differ from the trajectory observed in gaps formed by smaller treefall events [2], [6], [15], [31], [86] and secondary forests from anthropic activities, where fire and logging may increase biomass losses [41], [90] and limit species regeneration [40], [100]. Moreover, we revealed a gradient in demographic responses along the entire gradient of disturbance levels.…”

Section: Discussionsupporting

confidence: 61%

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Large-Scale Wind Disturbances Promote Tree Diversity in a Central Amazon Forest

et al. 2014

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Canopy gaps created by wind-throw events, or blowdowns, create a complex mosaic of forest patches varying in disturbance intensity and recovery in the Central Amazon. Using field and remote sensing data, we investigated the short-term (four-year) effects of large (>2000 m2) blowdown gaps created during a single storm event in January 2005 near Manaus, Brazil, to study (i) how forest structure and composition vary with disturbance gradients and (ii) whether tree diversity is promoted by niche differentiation related to wind-throw events at the landscape scale. In the forest area affected by the blowdown, tree mortality ranged from 0 to 70%, and was highest on plateaus and slopes. Less impacted areas in the region affected by the blowdown had overlapping characteristics with a nearby unaffected forest in tree density (583±46 trees ha−1) (mean±99% Confidence Interval) and basal area (26.7±2.4 m2 ha−1). Highly impacted areas had tree density and basal area as low as 120 trees ha−1 and 14.9 m2 ha−1, respectively. In general, these structural measures correlated negatively with an index of tree mortality intensity derived from satellite imagery. Four years after the blowdown event, differences in size-distribution, fraction of resprouters, floristic composition and species diversity still correlated with disturbance measures such as tree mortality and gap size. Our results suggest that the gradients of wind disturbance intensity encompassed in large blowdown gaps (>2000 m2) promote tree diversity. Specialists for particular disturbance intensities existed along the entire gradient. The existence of species or genera taking an intermediate position between undisturbed and gap specialists led to a peak of rarefied richness and diversity at intermediate disturbance levels. A diverse set of species differing widely in requirements and recruitment strategies forms the initial post-disturbance cohort, thus lending a high resilience towards wind disturbances at the community level.

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Section: Discussionsupporting

confidence: 84%

Section: Discussionsupporting

confidence: 61%

Large-Scale Wind Disturbances Promote Tree Diversity in a Central Amazon Forest

et al. 2014

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“…According to their study, the physiognomy of a stretch of forest depends heavily on the dominant species and the five or ten most common species usually represent more than half the number of Amazonian forest community. This observation was also verified by Melo (2004), Lima et al (2007), Lima et al (2012) and Condé and Tonini (2013).…”

Section: Discussionsupporting

confidence: 68%

Floristic and phytosociology in dense “terra firme” rainforest in the Belo Monte Hydroelectric Plant influence area, Pará, Brazil

Lemos¹,

Ferreira²,

Siqueira³

et al. 2015

Braz. J. Biol.

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The objective of the present study was to characterise the floristic and phytosociological composition on a stretch of dense "Terra Firme" rainforest located in the Belo Monte hydroelectric plant area of influence, located in the state of Pará, Brazil. All trees with DAP > 10 cm situated in 75 permanent plots of 1 ha were inventoried. 27,126 individuals trees (361 ind.ha-1), distributed in 59 botanical families, comprising 481 species were observed. The families with the largest number of species were Fabaceae (94), Araceae (65) and Arecaceae (43), comprising 43.7% of total species. The species Alexa grandiflora (4.41), Cenostigma tocantinum (2.50) and Bertholletia excelsa (2.28) showed the highest importance values (IV). The ten species with greater IV are concentrated (22%). The forest community has high species richness and can be classified as diverse age trees, heterogeneous and of medium conservation condition.Keywords: floristic survey, diversity, amazon species, rain forest. Florística e fitossociologia de um trecho de Floresta ombrófila densa de terra firme na área de influência da Usina Hidrelétrica Belo Monte, Pará, Brasil ResumoO presente estudo teve como objetivo caracterizar a composição florística e fitossociológica de um trecho de Floresta Ombrófila Densa de terra firme na área de influência da Usina Hidrelétrica Belo Monte, Pará, Brasil. Foram inventariadas todas as árvores com DAP > 10 cm em 75 parcelas permanentes de 1 ha. Foram observados 27.126 indivíduos arbóreos (361 ind.ha-1), distribuídos em 59 famílias botânicas, perfazendo 481 espécies. As famílias com maior número de espécies foram Fabaceae (94), Araceae (65) e Arecaceae (43), perfazendo 43,7% do total de espécies amostradas. As espécies Alexa grandiflora (4,41), Cenostigma tocantinum (2,50), Bertholletia excelsa (2,28), apresentaram os maiores valores de importância (VI), sendo que nas dez espécies com maiores IV, estão concentrados 22%. A comunidade florestal apresenta elevada riqueza florística e pode ser classificada como multiâneas, heterogêneas e com médio estado de conservação.Palavra-chave: levantamento florístico, diversidade, espécies amazônicas, floresta tropical.

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“…Indivíduos com DAP ≥ 90 cm apresentaram considerável estoque de biomassa, e quando abatidos ou mortos por causas naturais (DELANEY et al, 1998;GALE;BARFOD, 1999) representaram um deficit importante na distribuição e estoque de biomassa viva, pois é possível depreender que possuem ciclo de vida longo e incremento lento de acordo com Nascimento e Laurance 2006, e deste modo a recuperação do estoque pode demorar de dezenas a centenas de anos (LIMA et al, 2007).…”

Section: Resultsunclassified

Estoque E Dinâmica De Biomassa Arbórea Em Floresta Ombrófila Densa Na Flona Tapajós: Amazônia Oriental

Santos¹,

Camargo²,

Oliveira³

2018

Ciênc. Florest.

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A análise das oscilações dos estoques de biomassa em florestas tropicais permite descrever o comportamento desses ecossistemas diante de alterações naturais ou antropogênicas. O objetivo deste trabalho foi avaliar o estoque e a dinâmica de biomassa no período (2007-2010) em Floresta Ombrófila Densa de duas áreas de pesquisa na FLONA - Tapajós: Amazônia oriental, denominadas Área 1 e Área 2, distantes aproximadamente 45 km uma da outra. A biomassa foi estimada através de equação alométrica e medidas de DAP, proveniente de 12 parcelas permanentes, sendo 6 em cada área. Os resultados mostraram que houve diferença significativa no estoque médio anual de biomassa entre a Área 1 (293,19 ± 27,74; 298,21 ± 31,73; 299,60 ± 29,46; 298,11 ± 29,40 Mg.ha-1) e a Área 2 (254,35 ± 69,61; 259,10 ± 70,05; 261,00 ± 69,43; 248,92 ± 61,78 Mg.ha-1). Notou-se variação anual no estoque de biomassa em intervalos de medições superiores a um ano, devido às oscilações na taxa de mortalidade, recrutamento e incremento, além da área basal e abundância dos indivíduos em cada área. A maior concentração de indivíduos ocorreu nas classes diamétricas 10 ≤ DAP ≤ 30 cm, porém, verificou-se que os indivíduos com DAP ≥ 60 cm em concentração menor estocam biomassa equivalente à da classe diamétrica 10 ≤ DAP ≤ 30 cm. Concluiu-se que as oscilações na taxa de mortalidade, recrutamento e incremento, além da abundância e área basal nestes locais afetaram os estoques de biomassa.

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Análise da estrutura e do estoque de fitomassa de uma floresta secundária da região de Manaus AM, dez anos após corte raso seguido de fogo

Cited by 18 publications

References 9 publications

Large-Scale Wind Disturbances Promote Tree Diversity in a Central Amazon Forest

Large-Scale Wind Disturbances Promote Tree Diversity in a Central Amazon Forest

Floristic and phytosociology in dense “terra firme” rainforest in the Belo Monte Hydroelectric Plant influence area, Pará, Brazil

Estoque E Dinâmica De Biomassa Arbórea Em Floresta Ombrófila Densa Na Flona Tapajós: Amazônia Oriental

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