Distribution and abundance of vines in forest communities

Hegarty, Elwyn E.; Cabelle, G.

doi:10.1017/cbo9780511897658.013

Cited by 179 publications

(239 citation statements)

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“…A preponderance of large (Ͼ10 cm diameter) lianas appears to be an indicator of primary forest or areas subjected to few disturbances (Emmons and Gentry 1983, Peixoto and Gentry 1990, Hegarty and Caballé 1991. Areas prone to frequent perturbations apparently have many small, actively climbing lianas, as demonstrated by our comparison of liana size distributions on forest edges and interiors (Fig.…”

Section: Landscape-scale Variation In Liana Abundance and Biomassmentioning

confidence: 58%

Rain Forest Fragmentation and the Structure of Amazonian Liana Communities

Laurance

Pérez‐Salicrup

Delamônica

et al. 2001

Ecology

159

241

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Abstract. In tropical forests, lianas (woody vines) are important structural parasites of trees. We assessed the effects of forest fragmentation, treefall disturbance, soils, and stand attributes on liana communities in central Amazonian rain forests. Over 27 500 liana stems (Ն2 cm diameter at breast height [dbh]) were recorded in 27 1-ha plots in continuous forest and 42 plots in 10 forest fragments ranging from 1 to 100 ha in area. For each plot, an index of forest disturbance was determined from a 20-yr study of tree-community dynamics, and 19 soil-texture and chemistry parameters were derived from soil surface samples (top 20 cm).Liana abundance was 187-701 stems/ha, and liana aboveground dry biomass varied from 3.7 to 12.3 Mg/ha. Liana abundance increased significantly near forest edges and was significantly positively associated with forest disturbance and significantly negatively associated with tree biomass. Liana biomass was similarly associated with disturbance and tree biomass but also increased significantly along soil-fertility gradients. Plots near forest edges had a significantly higher proportion of small (2-3 cm dbh) lianas and relatively fewer large (Ն4 cm dbh) lianas than did sites in forest interiors.Liana communities were further assessed by comparing their species richness, composition, climbing guilds, and frequency of tree infestation in three 10-ha fragments. Within each fragment, data were collected in 24 small (400-m 2 ) plots, with half of the plots near edges and half in interiors. Significantly more trees were infested on fragment edges than in interiors. All three major guilds (branch-twiners, mainstem-twiners, tendril-twiners) were significantly more abundant on edges. Species diversity of lianas (as measured by Fisher's diversity index) also was significantly higher on edges, and this was not simply an artifact of increased liana abundance on edges.We conclude that many aspects of liana community structure are affected by habitat fragmentation, and we suggest that lianas can have important impacts on forest dynamics and functioning in fragmented rain forests. By creating physical stresses on trees and competing for light and nutrients, heavy liana infestations appear partly responsible for the dramatically elevated rates of tree mortality and damage observed near fragment edges.

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Section: Landscape-scale Variation In Liana Abundance and Biomassmentioning

confidence: 58%

Rain Forest Fragmentation and the Structure of Amazonian Liana Communities

Laurance

Pérez‐Salicrup

Delamônica

et al. 2001

Ecology

159

241

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“…Levando em conta seu histórico de perturbação com corte seletivo de grandes árvores, entre outras alterações, seriam necessários maiores estudos para embasar este tipo de consideração quanto ao estágio do fragmento estudado, uma vez que as lianas tendem a apresentar crescimento lento em diâmetro (Putz 1990, Hegarty & Caballé 1991, Teramura et al 1991), e classes de diâmetros não devem ser utilizados para indicar a idade estrutural de uma população de lianas se comparada com árvores (Hegarty & Caballé 1991), pois as lianas investem mais no crescimento em extensão (Putz 1990), dificultando uma estimativa da sua fase de desenvolvimento.…”

Section: Resultsunclassified

Estrutura fitossociológica da comunidade de lianas em uma floresta estacional semidecidual na Fazenda Canchim, São Carlos, SP

Hora¹,

Soares²

2002

Rev. bras. Bot.

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-(Phytosociological structure of a liana community in a seasonal semideciduous forest at Fazenda Canchim, São Carlos, SP). A phytosociological research concerning liana vegetation has been accomplished at Fazenda CanchimEmbrapa/CPPSE. The forest under analysis, which is fragmented in two parts, covers an area of 112 ha, located at 21º57' S and 47º50'W. 75 plots of 10 × 10 m were studied where all liana individuals had at least 2.5 cm in diameter, measured 1.3 m above soil level. Five hundred and twenty eight individuals were found, all of which belonged to 45 species, representing a specific diversity (H') 3.20 nats. Most of the species were among the families Bignoniaceae, Malpighiaceae, Sapindaceae, and Apocynaceae, representing together 71.11% of all samples. The species with higher importance value (VI) was Mansoa difficilis (Cham.) Bureau & K. Schum. Most of the sampled individuals were small in diameter and four reached over 10 cm. RESUMO -(Estrutura

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“…Due to their different pollination and seed dispersal mechanisms (Gentry, 1992), their increase would also impact conservation of fauna and flora (Phillips et at, 2002). Moreover, lianas have been found to impact the carbon cycle with their high productivity, selective suppression of the growth and regeneration of non-pioneers and increased mortality risk for large trees (Hegarty & Caballe, 1992;Schnitzer & Bongers, 2002).…”

Section: Introductionmentioning

confidence: 99%

Hyperspectral discrimination of tropical dry forest lianas and trees: Comparative data reduction approaches at the leaf and canopy levels

Kalácska

Bohlman

Sánchez‐Azofeifa

et al. 2007

Remote Sensing of Environment

109

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A dataset of spectral signatures (leaf level) of tropical dry forest trees and lianas and an airborne hyperspectral image (crown level) are used to test three hyperspectral data reduction techniques (principal component analysis, forward feature selection and wavelet energy feature vectors) along with pattern recognition classifiers to discriminate between the spectral signatures of lianas and trees. It was found at the leaf level the forward waveband selection method had the best results followed by the wavelet energy feature vector and a form of principal component analysis. For the same dataset our results indicate that none of the pattern recognition classifiers performed the best across all reduction techniques, and also that none of the parametric classifiers had the overall lowest training and testing errors. At the crown level, in addition to higher testing error rates (7%), it was found that there was no optimal data reduction technique. The significant wavebands were also found to be different between the leaf and crown levels. At the leaf level, the visible region of the spectrum was the most important for discriminating between lianas and trees whereas at the crown level the shortwave infrared was also important in addition to the visible and near infrared.

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Distribution and abundance of vines in forest communities

Cited by 179 publications

References 0 publications

Rain Forest Fragmentation and the Structure of Amazonian Liana Communities

Rain Forest Fragmentation and the Structure of Amazonian Liana Communities

Estrutura fitossociológica da comunidade de lianas em uma floresta estacional semidecidual na Fazenda Canchim, São Carlos, SP

Hyperspectral discrimination of tropical dry forest lianas and trees: Comparative data reduction approaches at the leaf and canopy levels

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