Aspectos florísticos, fitossociológicos e ecológicos de um sub-bosque de terra firme na Amazônia Central, Amazonas, Brasil

Oliveira, Arlem Nascimento de; Amaral, Iêda Leão do

doi:10.1590/s0044-59672005000100002

Cited by 45 publications

(33 citation statements)

References 14 publications

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“…Similar investigations in boreal, temperate and Mediterranean forest ecosystems have shown time lags ranging between 0 and 10 days (Bowling et al, 2002;Knohl et al, 2005;Werner et al, 2006;Ekblad and Hogberg, 2001;McDowell et al, 2004;Mortazavi et al, 2005). It is important to note that at these forest ecosystems the diversity of species per unit area is very low, whereas the forests of Central Amazonia have more than 200 species ha −1 (Oliveira and Mori, 1999;Oliveira and Amaral, 2004;Oliveira and Amaral, 2005 (Fig. 6a, b).…”

Section: Correlation Between δ 13 C Reco and Dsupporting

confidence: 64%

“…In October 2006, sun leaves at the top of the canopy were collected once by a tree climber at plateau and valley sections. Trees with botanical classification to species level were now systematically selected according to either their importance value index (IVI) or occurrence at both plateau and valley areas (Oliveira and Amaral, 2004;Oliveira and Amaral, 2005;I. L. do Amaral, personal communication).…”

Section: Sampling Of Foliage and Littermentioning

confidence: 99%

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Implications of CO2 pooling on δ13C of ecosystem respiration and leaves in Amazonian forest

et al. 2008

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Abstract. The carbon isotope of a leaf (δ 13 C leaf ) is generally more negative in riparian zones than in areas with low soil moisture content or rainfall input. In Central Amazonia, the small-scale topography is composed of plateaus and valleys, with plateaus generally having a lower soil moisture status than the valley edges in the dry season. Yet in the dry season, the nocturnal accumulation of CO 2 is higher in the valleys than on the plateaus. Samples of sunlit leaves and atmospheric air were collected along a topographical gradient in the dry season to test whether the δ 13 C leaf of sunlit leaves and the carbon isotope ratio of ecosystem respired CO 2 (δ 13 C Reco ) may be more negative in the valley than those on the plateau. The δ 13 C leaf was significantly more negative in the valley than on the plateau. Factors considered to be driving the observed variability in δ 13 C leaf were: leaf nitrogen concentration, leaf mass per unit area (LMA), soil moisture availability, more negative carbon isotope ratio of atmospheric CO 2 (δ 13 C a ) in the valleys during daytime hours, and leaf discrimination ( leaf ). The observed pattern of δ 13 C leaf might suggest that water-use efficiency (WUE) is higher on the plateaus than in the valleys. However, there was no full supporting evidence for this because it remains unclear how much of the difference in δ 13 C leaf was driven by physiology or δ 13 C a . The δ 13 C Reco was more negative in the valleys than on the plateaus on some nights, whereas in others it was not.Correspondence to: A. C. de Araújo (alessandro.araujo@falw.vu.nl) It is likely that lateral drainage of CO 2 enriched in 13 C from upslope areas might have happened when the nights were less stable. Biotic factors such as soil CO 2 efflux (R soil ) and the responses of plants to environmental variables such as vapor pressure deficit (D) may also play a role. The preferential pooling of CO 2 in the low-lying areas of this landscape may confound the interpretation of δ 13 C leaf and δ 13 C Reco .

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Section: Correlation Between δ 13 C Reco and Dsupporting

confidence: 64%

Section: Sampling Of Foliage and Littermentioning

confidence: 99%

Implications of CO2 pooling on δ13C of ecosystem respiration and leaves in Amazonian forest

et al. 2008

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“…Pulle e Attalea sp., evidenciando a alta tolerância destas palmeiras à pouca luminosidade, conforme registrado por outros autores em florestas tropicais (Denslow, 1987;matos & Amaral, 1999;Oliveira & Amaral, 2005 O dossel possui aspecto rugoso, com copas globosas, próximas uma das outras, resultando na pouca passagem de luz para os estratos inferiores. As espécies emergentes não ultrapassaram 35 m de altura (Figura 2), sendo Swartzia panacoco (Aubl.)…”

Section: Características Fisionômicasunclassified

Composição e diversidade florístico-estrutural de um hectare de floresta densa de terra firme na Amazônia Central, Amazonas, Brasil

et al. 2008

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Composition and floristic-structural diversity of a hectare of terra firme dense forest in Central Amazonia, Amazonas, Brazil aBSTRacT to investigate the composition and floristic diversity of one hectare of a dense forest on a terra firme oxisol plateau, 90 km from the manaus (02º35'45" s e 60º12'40" W), all trees, lianas and palm trees with diameter at breast height (DBh) ≥ 10 cm were inventoried along two parallel transects of 500 x 10 m. the landscape is vegetationally exuberant and homogeneous, with a large quantity of tall slender trees. A total of 670 individuals in 48 families, 133 genera and 245 species were registered in this floristic inventory. 467 of the plants sampled exhibited DBh ≤ 22.1 cm, representing 70% of the total. Abarema mataybifolia (sandw.) Barneby & Grimes, leonia glycycarpa ruiz & Pav., swartzia reticulata Ducke and Aspidosperma oblongum A. DC. were the species with DBh > 90 cm. Families with greatest species richness and importance value were Fabaceae, sapotaceae and lecythidaceae. the shannon-Wiener diversity (h' = 5.1) and evenness (e' = 0.92) indices suggest that the forest environment is very diversified, but with a relative uniformity of species. however, a uniform spatial distribution of the species in this forest environment was not observed. According to mantel's test (p < 0.001), the highest floristic similarity is a function of geographic proximity among suplots.

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“…Em nível de gênero, nota-se que apenas Protium (Burseraceae) tem boa representatividade tanto na área do presente estudo como nos trechos de Floresta Ombrófila e Floresta Estacional Perenifólia (IVANAUSKAS et al, 2004;LIMA-FILHO et al, 2004;OLIVEIRA & AMARAL, 2004, 2005, o que demonstra ampla distribuição desse gênero na região amazônica.…”

Section: Kunz S H Et Alunclassified

Estrutura fitossociológica de um trecho de floresta estacional perenifólia, Bacia do Rio Das Pacas, Querência - MT

Kunz

Martins

Ivanauskas

et al. 2010

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RESUMO:A borda sul da região amazônica apresenta um tipo peculiar de floresta, denominada de Floresta Estacional Perenifólia. Diante da falta de conhecimento deste tipo florestal, objetivou-se desenvolver um estudo relacionado à estrutura fitossociológica na bacia do rio das Pacas, em Querência-MT. A amostragem da vegetação consistiu na distribuição de 200 pontos-quadrantes, nos quais foram considerados os quatro indivíduos mais próximos de cada ponto, que tivessem diâmetro à altura de 1,30 m do solo (DAP) 10 cm. A densidade total da área amostrada foi 761 ind./ha, distribuídos em 53 espécies, 37 gêneros e 27 famílias.

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Aspectos florísticos, fitossociológicos e ecológicos de um sub-bosque de terra firme na Amazônia Central, Amazonas, Brasil

Cited by 45 publications

References 14 publications

Implications of CO<sub>2</sub> pooling on δ<sup>13</sup>C of ecosystem respiration and leaves in Amazonian forest

Implications of CO<sub>2</sub> pooling on δ<sup>13</sup>C of ecosystem respiration and leaves in Amazonian forest

Composição e diversidade florístico-estrutural de um hectare de floresta densa de terra firme na Amazônia Central, Amazonas, Brasil

Estrutura fitossociológica de um trecho de floresta estacional perenifólia, Bacia do Rio Das Pacas, Querência - MT

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Aspectos florísticos, fitossociológicos e ecológicos de um sub-bosque de terra firme na Amazônia Central, Amazonas, Brasil

Cited by 45 publications

References 14 publications

Implications of CO&lt;sub&gt;2&lt;/sub&gt; pooling on δ&lt;sup&gt;13&lt;/sup&gt;C of ecosystem respiration and leaves in Amazonian forest

Implications of CO&lt;sub&gt;2&lt;/sub&gt; pooling on δ&lt;sup&gt;13&lt;/sup&gt;C of ecosystem respiration and leaves in Amazonian forest

Composição e diversidade florístico-estrutural de um hectare de floresta densa de terra firme na Amazônia Central, Amazonas, Brasil

Estrutura fitossociológica de um trecho de floresta estacional perenifólia, Bacia do Rio Das Pacas, Querência - MT

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Implications of CO<sub>2</sub> pooling on δ<sup>13</sup>C of ecosystem respiration and leaves in Amazonian forest

Implications of CO<sub>2</sub> pooling on δ<sup>13</sup>C of ecosystem respiration and leaves in Amazonian forest