Gap size measurement: The proposal of a new field method

Lima, Renato A. F. de

doi:10.1016/j.foreco.2005.04.011

Cited by 48 publications

(48 citation statements)

References 16 publications

(54 reference statements)

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“…In each transect belt, we recorded the sizes and ages of the gaps. The size of each gap was determined by subdividing the irregularly shaped gaps into smaller sections and then measuring each section (de Lima, 2005). Gap age was calculated from the degree of decomposition of the gap makers (Liu & Hytteborn, 1991;Schnitzer & Carson, 2001).…”

Section: Effects Of Gap Size and Age On The Characteristics Of F Denmentioning

confidence: 99%

Effects of gap size, gap age, and bamboo Fargesia denudata on Abies faxoniana recruitment in South-western China

et al. 2015

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Aim of study: to study the effects of gap size, gap age and bamboo Fargesia denudata on natural regeneration of Abies faxoniana, both of which are the ubiquitous dominants in our research area.Area of study: subalpine coniferous forests in Wanglang Natural Reserve in Southwestern China. Material and Methods: 10 transect belts were randomly established, and a total of 97 gaps were recorded and used.Main results: (1) the number of bamboos with coverage of <17% significantly increased with increases of gap size and age, but the latter had little influence on the numbers of F. denudata with coverage of >17%. (2) F. denudata strongly inhibited A. faxoniana seedlings and saplings in small, young and old gaps, where the amount of A. faxoniana recruitment was relatively abundant, than in other types of gap. (3) The numbers of A. faxoniana seedlings in A-gaps, significantly decreased with the increases in gap size. However, in gaps where F. denudate was also present, A. faxoniana seedlings and saplings were insensitive to gap size or age. Research highlights: thick F. denudata would not be influenced by gap size or age. Because of the low occurrences of A. faxoniana seedlings and saplings, the negative effect of gap size, gap age and F. denudata on A. faxoniana recruitment was unclear

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Section: Effects Of Gap Size and Age On The Characteristics Of F Denmentioning

confidence: 99%

Effects of gap size, gap age, and bamboo Fargesia denudata on Abies faxoniana recruitment in South-western China

et al. 2015

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“…These methods mainly differ in the degree of form simplification, i.e. how well they capture boundary irregularities, moving from ellipses to polygons, octagons or hexadecagons, either with straight sides or with sections of an ellipse (Brokaw, 1982, Green, 1996, Lima, 2005, Runkle, 1981, Zhu et al, 2009. iii.…”

Section: Adaptation Of Gss To N Pumilio Forests 321 Definition Of mentioning

confidence: 99%

“…iii. Field Methods: Finally, different methods, such as measuring directions and distances from gap center or the triangles method (Lima, 2005), may be applied to measure the variables needed to calculate gap size. These methods may be more or less effective depending on the characteristics (such as understory density and height) of the forest being studied.…”

Section: Adaptation Of Gss To N Pumilio Forests 321 Definition Of mentioning

confidence: 99%

Sustainable Management of Lenga (Nothofagus pumilio) Forests Through Group Selection System

Bernal¹,

Defossé²,

Quinteros³

et al. 2012

Sustainable Forest Management - Current Research

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“…Green (1996), em uma análise pertinente de como o método de cálculo pode interferir na área total, encontrou uma variação média de 10% a 20% de diferença entre dois métodos distintos a partir de clareiras com os mesmos limites. Nesta mesma linha, Lima (2005) observou diferenças significativas entre os valores de área gerados por quatro diferentes métodos de cálculo, valores estes que variaram, em média, entre 12% e 60%, e que variaram em até 173% para uma mesma clareira. Uma síntese dos diferentes métodos de cálculo de área de clareiras é oferecida na tabela 2.…”

Section: Estrutura De Clareirasunclassified

“…Tais definições, bem como a área mínima de clareira, têm influência sobre a distribuição de classes de tamanho (Denslow & Hartshorn 1994) e sobre o cálculo da taxa de recorrência (Clark 1990). Considerando a importância destes dois parâmetros em ecossistemas florestais (Denslow 1987), a padronização dos métodos de definição, delimitação e cálculo de área de clareiras traria grandes benefícios para a ecologia florestal (Clark 1990, Lima 2005. Tipos de queda -Na literatura são registrados quatro tipos principais de eventos de queda que originam clareiras: (1) queda de galhos, (2) árvores mortas em pé (queda contínua de partes da copa), (3) árvores com tronco quebrado e (4) árvores desenraizadas (Orians 1982, Hubbell & Foster 1986.…”

Section: Estrutura De Clareirasunclassified

Estrutura e regeneração de clareiras em florestas pluviais tropicais

Lima¹

2005

Rev. bras. Bot.

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-(Canopy gap structure and regeneration in Tropical Rain Forests). This paper presents a critic review of the available knowledge on canopy gap structure and regeneration in Tropical Rain Forests. Separated on different issues such as gap size, type of treefall, physical environment, regeneration sources and ecological groups, each issue is explored in detail through the main studies published. Hence, old issues are discussed and gaps of knowledge are pointed out to enhance and ground future researches. As a result, it was observed that despite of more then three decades of research and several studies involving gap structure and regeneration, the research regarding the theme still has many questions to be answered. It also has limitations linked to the existing plurality of methods and to the difficulty of comparing different forests worldwide. It was concluded that the research involving gap structure and regeneration is on a theoretical refinement phase and, therefore, it is hard to evaluate the real contribution of canopy openings to the understanding of the different forests formations dynamics.Key words -ecological groups, gap colonization, gap regeneration, tropical rain forest RESUMO -(Estrutura e regeneração de clareiras em Florestas Pluviais Tropicais). Este trabalho apresenta uma revisão crítica do conhecimento disponível sobre a estrutura e regeneração de clareiras naturais em Florestas Pluviais Tropicais. Separada em diferentes temas como tamanho de clareiras, tipos de queda, ambiente físico, fontes de regeneração e grupos ecológicos, cada tema é explorado em detalhe através dos trabalhos publicados mais relevantes. Assim, conceitos antigos são expostos e discutidos, e as lacunas de conhecimento são destacadas para enriquecer e embasar novos trabalhos. Como resultado, observou-se que apesar de mais de três décadas de estudo e do grande número de trabalhos envolvendo estrutura e regeneração de clareiras, a pesquisa científica no tema ainda possui muitas perguntas a serem respondidas. Ela também possui limitações relacionadas à diversidade de métodos existentes e à dificuldade de comparação entre diferentes florestas do mundo. Concluise, portanto, que a pesquisa sobre a estrutura e regeneração de clareiras encontra-se em fase de refinamento teórico e que, por isso, é difícil avaliar a real contribuição da abertura de clareiras no entendimento da dinâmica das diferentes formações florestais.Palavras-chave -colonização de clareiras, floresta pluvial tropical, grupos ecológicos, regeneração de clareiras

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Gap size measurement: The proposal of a new field method

Cited by 48 publications

References 16 publications

Effects of gap size, gap age, and bamboo Fargesia denudata on Abies faxoniana recruitment in South-western China

Effects of gap size, gap age, and bamboo Fargesia denudata on Abies faxoniana recruitment in South-western China

Sustainable Management of Lenga (Nothofagus pumilio) Forests Through Group Selection System

Estrutura e regeneração de clareiras em florestas pluviais tropicais

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