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Full-Text Articles in Life Sciences
Illumination-Size Relationships Of 109 Coexisting Tropical Forest Tree Species, Douglas Sheil, Agus Salim, Jérôme Chave, Jerome K. Vanclay, William D. Hawthorne
Illumination-Size Relationships Of 109 Coexisting Tropical Forest Tree Species, Douglas Sheil, Agus Salim, Jérôme Chave, Jerome K. Vanclay, William D. Hawthorne
Professor Jerome K Vanclay
Summary 1 Competition for light is a central issue in ecological questions concerning forest tree differentiation and diversity. Here, using 213 106 individual stem records derived from a national survey in Ghana, West Africa, we examine the relationship between relative crown exposure, ontogeny and phylogeny for 109 canopy species. 2 We use a generalized linear model (GLM) framework to allow interspecific comparisons of crown exposure that control for stem-size. For each species, a multinomial response model is used to describe the probabilities of the relative canopy illumination classes as a function of stem diameter. 3 In general, and for all …
Regeneration Changes In Tree Species Abundance Diversity And Structure In Logged And Unlogged Subtropical Rainforest Over A 36-Year Period, Maina Kariuki, Robert M. Kooyman, R Geoff B. Smith, Grant Wardell-Johnson, Jerome K. Vanclay
Regeneration Changes In Tree Species Abundance Diversity And Structure In Logged And Unlogged Subtropical Rainforest Over A 36-Year Period, Maina Kariuki, Robert M. Kooyman, R Geoff B. Smith, Grant Wardell-Johnson, Jerome K. Vanclay
Professor Jerome K Vanclay
The long-term effects of logging treatments on rainforest regeneration are difficult to quantify due to compounding interactions with natural dynamics, site characteristics and tree species. The aim of this study was to examine regeneration differences over a 36-year period in stands subjected to various levels of disturbance ranging from natural, through an increasing intensity of individual tree removal to intensive logging. Multivariate and univariate analyses of trees ¡Ý 10 cm diameter at 1.3 m above the ground (dbh) showed that regeneration responses were generally correlated with disturbance gradient. In the undisturbed controls there were gradual changes that had no significant …
Diameter Growth Performance Varies With Species Functional-Group And Habitat Characteristics In Subtropical Rainforests, Maina Kariuki, Margaret Rolfe, R Geoff B. Smith, Jerome K. Vanclay, Robert M. Kooyman
Diameter Growth Performance Varies With Species Functional-Group And Habitat Characteristics In Subtropical Rainforests, Maina Kariuki, Margaret Rolfe, R Geoff B. Smith, Jerome K. Vanclay, Robert M. Kooyman
Professor Jerome K Vanclay
We examined tree diameter growth in 20 plots subjected to various disturbance intensities (natural, low, moderate and intensive logging) in a bid to understand the general tree growth responses in relation to habitat characteristics in subtropical rainforests of north-eastern NSW, Australia. Species-specific regeneration strategy, maximum size and level of shade tolerance were used to classify species into five groups: emergent and shade tolerant main canopy (group 1), shade tolerant mid canopy (2), shade tolerant understoreys (3), moderate shade tolerant (4) and shade intolerant (5) tree species. Data series for trees ‗10 cm diameter at 1.3 m above the ground level …