Ecological Observations in the Dwarf Cloud Forest of the Luquillo Mountains in Puerto Rico

Weaver, Peter L.; Medina, Ernesto; Pool, Douglas J.; Dugger, Ken; Gonzáles-Liboy, José; Cuevas, Elvira

doi:10.2307/2388367

Cited by 80 publications

(52 citation statements)

References 18 publications

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“…Com o aumento da altitude, esperava-se que o número de indivíduos por hectare aumentasse, que houvesse decréscimo da altura dos indivíduos do dossel, do diâmetro médio, da área basal por hectare e do número de espécies por área (Weaver et al 1986). Os indivíduos arbóreos amostrados, na sua maioria, apresentavam troncos pouco desenvolvidos e vários eram perfilhados a altura do peito e densamente cobertos por briófitas, como esperado para florestas alto-montanas.…”

Section: Discussionunclassified

Variações na composição florística e na estrutura fitossociológica de uma floresta ombrófila densa alto-montana na Serra da Mantiqueira, Monte Verde, MG

Meireles¹,

Shepherd²,

Kinoshita³

2008

Rev. bras. Bot.

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-(Variations in floristic and phytosociological structure of an upper montane forest in Mantiqueira Range, Monte Verde, MG). The upper montane forests are known to have a different floristic composition and phytosociological structure from forests located at lower altitudes. A survey was carried out in an area of upper montane forest of the Mantiqueira Range near Monte Verde, municipality of Camanducaia, Minas Gerais State, Brazil. The main objective of this study was to analyze the effect of an altitudinal gradient on the floristic composition and vegetation structure. Seven blocks, each with five of 10 × 10 m plots, were located at altitudes ranging from 1,820 m to 1,940 m, and all bamboos and trees with GHB ³ 15 cm were sampled. A total of 1,191 individuals were included, belong to 64 tree species and two bamboos in a total of 42 genera and 26 families, including the standing dead individuals. The estimated density was 3,403 ind ha -1 and the value of the Shannon-Wiener (H') index was 3.284 nat ind -1 . The dead biomass had the highest importance value (42.06), followed by Pimenta pseudocaryophyllus (Gomes) Landrum (24.59), Roupala rhombifolia Mart. ex Meisn. (19.98) and Drimys brasiliensis Miers (18.57). The structural parameters maximum canopy height and number of branched individuals were correlated with altitude. Although the altitudinal gradient is relatively short, a considerable degree of species substitution was observed, leading to a well-marked floristic gradient.Key words -altitude, Atlantic Rain Forest, Mantiqueira Range, phytosociology, upper montane forest RESUMO -(Variações na composição florística e na estrutura fitossociológica de uma floresta ombrófila densa alto-montana na Serra da Mantiqueira, Monte Verde, MG). As florestas alto-montanas são reconhecidas por apresentarem composição florística e estrutura fitossociológica distintas das florestas em cotas altitudinais inferiores. Realizou-se um levantamento fitossociológico em uma floresta alto-montana localizada na Serra da Mantiqueira, distrito de Monte Verde, Camanducaia, Minas Gerais. O principal objetivo foi analisar o efeito do gradiente altitudinal na composição florística e na estrutura fitossociológica da vegetação. Foram instalados sete blocos paralelos com cinco parcelas contíguas de 10 × 10 m, distantes 50 m, entre 1.840 e 1.920 m de altitude. Todos os indivíduos arbóreos com CAP ³ 15 cm foram amostrados, assim como as "moitas de bambu" que continham no mínimo 10 perfilhos. Foram amostrados 1.191 indivíduos, pertencentes a 64 espécies arbóreas e duas espécies de bambu, distribuídas entre 42 gêneros e 26 famílias, além da classe de indivíduos mortos. A densidade total equivalente foi de 3.403 ind ha -1 e o índice de diversidade de Shannon-Wiener (H') foi de 3,284 nat ind -1 . A biomassa morta destacou-se pelo elevado valor de importância (42,06), seguida de Pimenta pseudocaryophyllus (Gomes) Landrum (24,59), Roupala rhombifolia Mart. ex Meisn. (19,98) e Drimys brasiliensis Miers (18,57). Entre os parâmetros estruturais...

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Section: Discussionunclassified

Variações na composição florística e na estrutura fitossociológica de uma floresta ombrófila densa alto-montana na Serra da Mantiqueira, Monte Verde, MG

Meireles¹,

Shepherd²,

Kinoshita³

2008

Rev. bras. Bot.

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“…The soil organic matter content in a soil expresses the relationship between the sources of organic materials and the decomposing factors (soil biota) [37]. Soil organic matter (SOM) level in the study area of Horton Plains has not reached upper levels in the range, up to 12%, as expected in tropical moist evergreen forests [38]. In ordinary tropical moist evergreen forests, SOM content varies around 6% [39].…”

Section: Heavy Metals In Soil (Pb and Cd)mentioning

confidence: 77%

Soil Chemical Quality and Forest Dieback

Gunadasa¹,

Yapa²

2015

IJESD

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Abstract-The study was aimed at investigating the effectiveness of recovering degraded soil chemical qualities to mitigate the mysterious forest dieback in a montane forest. Soil amendments with standard compost, montane mycorrhizae, standard compost with montane mycorrhizae, and a control were used as treatments. Syzygium rotundifolium saplings were used as the indicator plant. Soil pH, EC, Soluble soil Pb, Cd and soil organic matter was compared at 0.20m soil depth. Foliar samples from "treated" saplings were tested for Pb and Cd. Contamination of soil and leaves of the saplings with Pb (p <0.001) and Cd (p<0.001) was evident. Positive correlations between soil Pb and Cd and leaf Pb and Cd were observed (p=0.001). Soil amendment with compost and montane mycorrhizae reduced the soluble Pb content (p=<0.001). Soil amendment with standard compost and montane mycorrhizae was effective in saving the saplings from Pb and Cd toxicity (p<0.001).Index Terms-Montane forest, forest dieback, soil chemical properties.

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“…The information was initially used to determine tree species' compositions and distributions, typical tree sizes, stem densities, basal areas, locally derived volume tables, and d.b.h. growth rates by tree species and Johnston (1990);Weaver (1983Weaver ( , 1998Weaver ( , 2002b Weaver (1983Weaver ( , 1987aWeaver ( , 1987bWeaver ( , 1989bWeaver ( , 2000a). e Sources: Frangi and Lugo (1985, 1998Lugo and Frangi (1993);Weaver (1983).…”

Section: Field Sampling and Permanent Plot Monitoringmentioning

confidence: 99%

“…Magnolia splendens, popular as a cabinet wood, was logged in the forest until the early 1950s (Weaver 1987b). By the early 1970s, many accessible mature specimens of magnolia had already been removed from the lower montane forest and a few bordering areas of montane forest, thus reducing seed sources.…”

Section: Montane Forestmentioning

confidence: 99%