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Articles 31 - 60 of 62
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Estructura Y Composición Florística Del Bosque De La Llanura Aluvial En La Amazonía Peruana: I. El Bosque Alto, Gustav Nebel, Lars Peter Kvist, Jerome K. Vanclay, Henning Christensen, Luis Freitas, Juan Ruiz
Estructura Y Composición Florística Del Bosque De La Llanura Aluvial En La Amazonía Peruana: I. El Bosque Alto, Gustav Nebel, Lars Peter Kvist, Jerome K. Vanclay, Henning Christensen, Luis Freitas, Juan Ruiz
Professor Jerome K Vanclay
Three peruvian flood plain forests adjacent to the Ucayali river were sampled using nine one hectare permanent sample plots in which stems exceeding 10 cm DBH were identified and measured. These plots have been measured 4 times during 1993- 1997, and provide the basis for the results reported here. Three plots were established in each of the three forest types high restinga, low restinga, and tahuampa, characterized in part by and annual inundation of 1, 2 and 4 months per year, respectively. Stem density varies from 446 to 601 per ha, and the basal area ranges between 20-29 m2/ha. A …
The Amazon Flood Plain Forest Tree Maquira Coriacea (Karsten) C.C. Berg: Aspects Of Ecology And Management, Gustav Nebel, Jens Dragsted, Thomas R. Simonsen, Jerome K. Vanclay
The Amazon Flood Plain Forest Tree Maquira Coriacea (Karsten) C.C. Berg: Aspects Of Ecology And Management, Gustav Nebel, Jens Dragsted, Thomas R. Simonsen, Jerome K. Vanclay
Professor Jerome K Vanclay
Maquira coriacea is a commercial tree species growing throughout the Amazon flood plain forests. Densities up to 14/ha of individuals, ≥10 cm diameter at breast height (DBH) were observed, corresponding to a basal area of 2 m2/ha and a volume of 38 m3/ha. The primary period of fruiting coincided with the annual flooding, but fruits were also produced in other parts of the year. Seedlings with densities up to 150/m2 were concentrated around mother trees, and the stocks fluctuated much over the year due to mortality caused by flooding and wilting in dry periods. Growth data mainly from nine 1 …
Estructura Y Composición Florística Del Bosque De La Llanura Aluvial Inundable De La Amazonía Peruana: Ii. El Sotobosque De La Restinga, Gustav Nebel, Jens Dragsted, Jerome K. Vanclay
Estructura Y Composición Florística Del Bosque De La Llanura Aluvial Inundable De La Amazonía Peruana: Ii. El Sotobosque De La Restinga, Gustav Nebel, Jens Dragsted, Jerome K. Vanclay
Professor Jerome K Vanclay
Structure and floristic composition of small trees and shrubs (1.5 m height to 10 cm DBH) are described in two flood plain forests of the lower Ucayali river, Peruvian Amazon. The forests are of high and low restinga type, on an annual average flooded around 1 and 2 months, respectively. The soils are nutrients rich entisolls, and the vegetation forms closed high canopy forests with presence of emergents. A total of 25 permanent sample plots covering 0.64 ha were established. They are nested within six quadratic one-hectare permanent sample plots where large individuals (>= 10 cm DBH) were inventoried. …
Structure And Floristic Composition Of Flood Plain Forests In The Peruvian Amazon: I. Overstorey, Gustav Nebel, Lars Peter Kvist, Jerome K. Vanclay, Henning Christensen, Luis Freitas, Juan Ruiz
Structure And Floristic Composition Of Flood Plain Forests In The Peruvian Amazon: I. Overstorey, Gustav Nebel, Lars Peter Kvist, Jerome K. Vanclay, Henning Christensen, Luis Freitas, Juan Ruiz
Professor Jerome K Vanclay
Three Peruvian flood plain forests adjacent to the Ucayali river were sampled using nine 1 ha permanent sample plots in which stems exceeding 10 cm DBH were identified and measured. These plots were measured four times during 1993–1997. Three plots were established in each of the three forest types high restinga, low restinga, and tahuampa, characterised in part by an annual inundation of one, two and four months per year, respectively. Stem density varied from 446 to 601 per hectare, and the basal area ranged between 20 and 29 m2/ha. A total of 321 species were recorded in the nine …
What Would A Global Forest Convention Mean For Tropical Forests And For Timber Consumers?, Jerome K. Vanclay, J Doland Nichols
What Would A Global Forest Convention Mean For Tropical Forests And For Timber Consumers?, Jerome K. Vanclay, J Doland Nichols
Professor Jerome K Vanclay
A global forest convention has been advocated for about 15 years, but progress is slow and positions of advocates and opponents appear entrenched. We review several case studies and offer new empirical evidence relating to causes of and remedies for deforestation. We find no evidence to suggest that a forest convention will be effective in halting deforestation. Our data indicate that development assistance may be the most effective approach to save forests in developing countries. It appears that “money speaks louder than words.” We conclude that a global forest convention will be ineffective unless accompanied by substantial and well-directed development …
Ranking Forestry Journals Using The H-Index, Jerome K. Vanclay
Ranking Forestry Journals Using The H-Index, Jerome K. Vanclay
Professor Jerome K Vanclay
An expert ranking of forestry journals was compared with Journal Impact Factors and h-indices computed from the ISI Web of Science and internet-based data. Citations reported by Google Scholar offer an efficient way to rank all journals objectively, in a manner consistent with other indicators. This h-index exhibited a high correlation with the Journal Impact Factor (r = 0.92), but is not confined to journals selected by any particular commercial provider. A ranking of 180 forestry journals is presented, on the basis of this index.
Improving Dimensional Stability In Plantation-Grown E. Pilularis And E. Dunnii, Carolyn A. Raymond, Michael Henson, Marie-Chantale Pelletier, Steve Boyton, Bill Joe, Dane Thomas, Helen Smith, Jerome K. Vanclay
Improving Dimensional Stability In Plantation-Grown E. Pilularis And E. Dunnii, Carolyn A. Raymond, Michael Henson, Marie-Chantale Pelletier, Steve Boyton, Bill Joe, Dane Thomas, Helen Smith, Jerome K. Vanclay
Professor Jerome K Vanclay
No abstract provided.
Mixed-Species Plantation Of Eucalyptus With Nitrogen Fixing Trees: A Review, David I. Forrester, Jürgen Bauhus, Annette L. Cowie, Jerome K. Vanclay
Mixed-Species Plantation Of Eucalyptus With Nitrogen Fixing Trees: A Review, David I. Forrester, Jürgen Bauhus, Annette L. Cowie, Jerome K. Vanclay
Professor Jerome K Vanclay
Mixed-species plantations of Eucalyptus with a nitrogen (N2) fixing species have the potential to increase productivity while maintaining soil fertility, compared to Eucalyptus monocultures. However, it is difficult to predict combinations of species and sites that will lead to these benefits. We review the processes and interactions occurring in mixed plantations, and the influence of species or site attributes, to aid the selection of successful combinations of species and sites. Successful mixtures, where productivity is increased over that of monocultures, have often developed stratified canopies, such that the less shade-tolerant species overtops the more shade-tolerant species. Successful mixtures also have …
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 …
Social And Ecological Issues For Private Native Forestry In North-Eastern New South Wales, Australia, V Alex Jay, J Doland Nichols, Jerome K. Vanclay
Social And Ecological Issues For Private Native Forestry In North-Eastern New South Wales, Australia, V Alex Jay, J Doland Nichols, Jerome K. Vanclay
Professor Jerome K Vanclay
Forests in north-eastern New South Wales have often been the focus of controversy. The tension between production and preservation continues and hampers current negotiations for a code of practice for private native forestry. The structure of many private forests reflects past mismanagement and silvicultural intervention would benefit both conservation and production objectives, but such intervention is rarely financially viable. This paper sets out the economic and ecological basis for private native forestry. Both the timber industry and nature-based tourism are major contributors to the local economy, and both rely in part on private native forests. Draft regulations currently under negotiation …
Dynamics Of Tree Diversity In Undisturbed And Logged Subtropical Rainforest In Australia, R Geoff B. Smith, J Doland Nichols, Jerome K. Vanclay
Dynamics Of Tree Diversity In Undisturbed And Logged Subtropical Rainforest In Australia, R Geoff B. Smith, J Doland Nichols, Jerome K. Vanclay
Professor Jerome K Vanclay
In subtropical rainforest in eastern Australia, changes in the diversity of trees were compared under natural conditions and eight silvicultural regimes over 35 years. In the treated plots basal area remaining after logging ranged from 12 to 58 m2 per ha. In three control plots richness differed little over this period. In the eight treated plots richness per plot generally declined after intervention and then gradually increased to greater than original diversity. After logging there was a reduction in richness per plot and an increase in species richness per stem in all but the lightest selective treatments. The change in …
Growth And Species Interactions Of Eucalyptus Pellita In A Mixed And Monoculture Plantation In The Humid Tropics Of North Queensland, Mila Bristow, Jerome K. Vanclay, Lyndon O. Brooks, Mark Hunt
Growth And Species Interactions Of Eucalyptus Pellita In A Mixed And Monoculture Plantation In The Humid Tropics Of North Queensland, Mila Bristow, Jerome K. Vanclay, Lyndon O. Brooks, Mark Hunt
Professor Jerome K Vanclay
This study investigated whether mixed-species designs can increase the growth of a tropical eucalypt when compared to monocultures. Monocultures of Eucalyptus pellita (E) and Acacia peregrina (A) and mixtures in various proportions (75E:25A, 50E:50A, 25E:75A) were planted in a replacement series design on the Atherton Tablelands of north Queensland, Australia. High mortality in the establishment phase due to repeated damage by tropical cyclones altered the trial design. Effects of experimental designs on tree growth were estimated using a linear mixed effects model with restricted maximum likelihood analysis (REML). Volume growth of individual eucalypt trees were positively affected by the presence …
Gauging The Impact Of Journals, Jerome K. Vanclay
Gauging The Impact Of Journals, Jerome K. Vanclay
Professor Jerome K Vanclay
Many stakeholders, including authors, editors, librarians and funding agencies, have an interest in reliable assessments of journal impact, but the provision of this service has long been dominated by a single service, the Journal Impact Factor (JIF; Garfield, 1955) provided by the ISI and Thomson Scientific. Despite several limitations (Hecht et al., 1998; Moed et al., 1999; van Leeuwen et al., 1999; Saha et al., 2003; Dong et al., 2005; Moed, 2005; Dellavalle et al., 2007), the JIF continues to be the dominant indicator of journal performance. Recently, Hirsch’s h-index (Hirsch, 2005; Bornmann and Daniel, 2007) has been suggested as …
Community Attitudes Towards Private Native Forestry In New South Wales, Jerome K. Vanclay
Community Attitudes Towards Private Native Forestry In New South Wales, Jerome K. Vanclay
Professor Jerome K Vanclay
An on-line survey during August-September 2006 examined community attitudes toward private native forestry. Survey findings (n=156) confirmed prior hypotheses that attitudes would correlate with associations (e.g., professionals in favour of incentives, farmers in favour of freedom to manage, conservationists in favour of regulations), and with interest (biodiversity enthusiasts in favour of regulations; producers in favour of incentives), but refuted the prior hypotheses that urban dwellers would be more likely to favour regulations. Respondents appear to reflect different constituencies with divergent views without a shared understanding of the condition and dynamics of these forests. This indicates the need for more extension …
On The Robustness Of The H-Index, Jerome K. Vanclay
On The Robustness Of The H-Index, Jerome K. Vanclay
Professor Jerome K Vanclay
The h-index (Hirsch, 2005) is robust, remaining relatively unaffected by errors in the long tails of the citations-rank distribution, such as typographic errors that short-change frequently-cited papers and create bogus additional records. This robustness, and the ease with which h-indices can be verified, support the use of a Hirsch-type index over alternatives such as the journal impact factor. These merits of the h-index apply to both individuals and to journals.
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 …
Realising Opportunities In Forest Growth Modelling, Jerome K. Vanclay
Realising Opportunities In Forest Growth Modelling, Jerome K. Vanclay
Professor Jerome K Vanclay
The world is continually changing: the emergence of new technology and new demands for pertinent information pose new challenges and possibilities for forest management. Are forest growth models keeping up with client needs? To remain relevant, modelers need to anticipate client needs, gauge the data needed to satisfy these demands, develop the tools to collect and analyze these data efficiently, and resolve how best to deliver the resulting models and other findings. Researchers and managers should jointly identify and articulate anticipated needs for the future, and initiate action to satisfy them. New technology that offers potential for innovation in forest …
Indicator Groups And Faunal Richness, Jerome K. Vanclay
Indicator Groups And Faunal Richness, Jerome K. Vanclay
Professor Jerome K Vanclay
Species richness is a popular indicator of ecosystem vitality, but is difficult to assess. Many natural resource managers seek an efficient bioindicator, but the link between candidate indicators and the richness of other taxononic groups remains elusive. A series of faunal surveys in the Mbalmayo Forest Reserve in Cameroon suggest that it may be possible to devise faunal bioindicators. The species richness of birds, of butterflies and of termites is significantly correlated with total faunal richness across eight species groups, suggesting that these groups may have potential as bioindicators, alone or in combination. Although expensive, further research is warranted because …
Spatially-Explicit Competition Indices And The Analysis Of Mixed-Species Plantings With The Simile Modelling Environment, Jerome K. Vanclay
Spatially-Explicit Competition Indices And The Analysis Of Mixed-Species Plantings With The Simile Modelling Environment, Jerome K. Vanclay
Professor Jerome K Vanclay
Individual-based modelling and analysis of forest experiments has been made more accessible to researchers with the advent of modelling environments like Simile from www.simulistics.com. Individual-based analyses of tree growth data offer insights not possible with plot-based analyses, especially when the original experimental design has been compromised by mortality or other unforeseen events. The paper illustrates how Simile can be used for individual-based analyses of mixed plantings, and how it can be used to explore the consequences of the resulting statistical models. A mixed-species planting of Eucalyptus pellita and Acacia peregrina is used to illustrate possibilities.
Site Index Equation For Smallholder Plantations Of Gmelina Arborea In Leyte Province, The Philippines, Jerome K. Vanclay, Jack Baynes, Edwin Cedamon
Site Index Equation For Smallholder Plantations Of Gmelina Arborea In Leyte Province, The Philippines, Jerome K. Vanclay, Jack Baynes, Edwin Cedamon
Professor Jerome K Vanclay
The equation SiteIndex = Height × Log(IndexYear+0.5) / Log(Age+0.5) is suggested as a robust way to classify site index of small private Gmelina arborea plantations in Leyte province in the Philippines. Estimates of site index from this equation correlate well with other indicators of site productivity, including the observed mean annual volume increment and soil depth. An alternative equation based on slope and soil depth offers an indication of potential site productivity on unforested sites where no crop trees are present.
Structure And Floristic Composition Of Flood Plain Forests In The Peruvian Amazon, Ii. The Understorey Of Restinga Forests, Gustav Nebel, Jens Dragsted, Jerome K. Vanclay
Structure And Floristic Composition Of Flood Plain Forests In The Peruvian Amazon, Ii. The Understorey Of Restinga Forests, Gustav Nebel, Jens Dragsted, Jerome K. Vanclay
Professor Jerome K Vanclay
Structure and floristic composition of small trees and shrubs (1.5 m height to 10 cm diameter at breast height was described in two flood plain forests of the lower Ucayali river, Peruvian Amazon. The forests were of the high and low restinga type, on an annual average flooded around 1 and 2 months, respectively. The soils were nutrient rich entisols, and the vegetation forms closed high canopy forests with presence of emergents. A total of 25 permanent sample plots covering 0.64 ha were established. They were nested within six quadratic 1 ha permanent sample plots where large individuals (>10 …
Sustainable Forestry In The Tropics: Panacea Or Folly?, David W. Pearce, Francis E. Putz, Jerome K. Vanclay
Sustainable Forestry In The Tropics: Panacea Or Folly?, David W. Pearce, Francis E. Putz, Jerome K. Vanclay
Professor Jerome K Vanclay
The profitability of uncontrolled logging can be a significant obstacle to sustainable forest management, especially in the tropics. Rice et al. (1997) have argued that not only does traditional selective logging provide higher returns but also incurs less damage to forests than sustainable forest management systems that involve harvesting of many species and the creation of large gaps in the forest canopy to foster regeneration of light-demanding species. They claimed that protected areas were the only viable way to conserve forest ecosystems and proposed that loggers be allowed to log forests selectively once, after which the forests should become parks. …
Forest Dynamics In Flood Plain Forests In The Peruvian Amazon: Effects Of Disturbance And Implications For Management, Gustav Nebel, Lars Peter Kvist, Jerome K. Vanclay, Hector Vidaurre
Forest Dynamics In Flood Plain Forests In The Peruvian Amazon: Effects Of Disturbance And Implications For Management, Gustav Nebel, Lars Peter Kvist, Jerome K. Vanclay, Hector Vidaurre
Professor Jerome K Vanclay
Forest dynamics were studied from 1993 to 1997 for individuals > 10 cm DBH in nine 1 ha permanent sample plots. They were established in natural flood plain forests located on the lower Ucayali river in the Peruvian Amazon. After inventories of three plots in each of three forest types, a light and a heavy felling treatment were applied to each of the two plots, while a third plot was kept untreated. Average annual stem mortality and recruitment rates in the untreated plots were among the highest observed in neotropical rain forests: mortality 2.2-3.2% per year, recruitment 3.0-4.6% per year. Dead …
The Effectiveness Of Parks, Jerome K. Vanclay
The Effectiveness Of Parks, Jerome K. Vanclay
Professor Jerome K Vanclay
Bruner et al. examined the effectiveness of parks in the tropics, drawing on survey data to support their contention that parks 1) have been effective; 2) need more support; and 3) should remain a central component of conservation strategies. Their conclusions remain equivocal...
Colour Variation And Correlations In Eucalyptus Dunnii Sawnwood, Jerome K. Vanclay, Michael Henson, Graeme Palmer
Colour Variation And Correlations In Eucalyptus Dunnii Sawnwood, Jerome K. Vanclay, Michael Henson, Graeme Palmer
Professor Jerome K Vanclay
A study of material thinned from a 9-year-old Eucalyptus dunnii progeny trial revealed that E. dunnii has light yellowish wood that is relatively uniform in color, and varies little within and between trees. The variation in color between half-sib families is small, but is statistically signifi - cant (P = 0.008). Most of the color variation relates to the yellowness (CIE b*) of the wood, which in heartwood is moderately heritable (h = 0.6). The color of the endgrain, especially its lightness (CIE L*) and whiteness index (E313), is correlated with basic density, hardness, and rates of shrinkage. The CIE …
Experiment Designs To Evaluate Inter- And Intra-Specific Interactions In Mixed Plantings Of Forest Trees, Jerome K. Vanclay
Experiment Designs To Evaluate Inter- And Intra-Specific Interactions In Mixed Plantings Of Forest Trees, Jerome K. Vanclay
Professor Jerome K Vanclay
A review of three mixed-species trials reveals the utility of competition indices for evaluating inter- and intra-specific interactions between trees, the desirability of experiments that span a range of tree spacing and composition to inform calibration of these competition indices, the need for extremes of species composition and stand density to calibrate response surfaces, and the far-reaching impact of edge-effects. Experiment layouts commonly used for mixed-species trials in forestry (such as replacement series) rarely provide a strong basis to calibrate competition indices and response surfaces. Alternative designs involving systematic changes in species composition may offer a better basis for calibrating …
How To Foster Good Husbandry Of Private Native Forests, Jerome K. Vanclay
How To Foster Good Husbandry Of Private Native Forests, Jerome K. Vanclay
Professor Jerome K Vanclay
It is generally agreed that effective conservation requires the cooperation of private landholders to complement reserve-based efforts, but there is little agreement about how this can best be achieved. Various stakeholders lobby for tough regulations, for greater landholder freedom, and for incentives for activities or outcomes. A review of these alternatives suggests an emerging consensus that incentives are the most effective approach. Policy-makers should consider incentive-based approaches such as stewardship support to foster conservation outcomes on private lands.
Why Model Landscapes At The Level Of Households And Fields?, Jerome K. Vanclay
Why Model Landscapes At The Level Of Households And Fields?, Jerome K. Vanclay
Professor Jerome K Vanclay
Sustainable resource management relies upon many disciplines and deals with complex interactions at the landscape scale. Many of the issues at the landscape scale arise from decisions taken at the household level and affect land use in fields and in small patches of forest. Spatially-explicit modelling of these units is desirable because it enables rigorous testing of model predictions, and thus of underlying propositions. The greatest insights may be obtained by participatory modelling of these processes as we understand them. Despite this, few models simulate dynamics at the household and field level. FLORES, the Forest Land Oriented Resource Envisioning System, …
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 …
Spiral And Interlocking Grain In Eucalyptus Dunnii, C Thinley, Graeme Palmer, Jerome K. Vanclay, Michael Henson
Spiral And Interlocking Grain In Eucalyptus Dunnii, C Thinley, Graeme Palmer, Jerome K. Vanclay, Michael Henson
Professor Jerome K Vanclay
Spiral grain in 181 trees from a 9-year-old plantationgrown Eucalyptus dunnii was normally distributed with mean −0.33 degrees (to the left) and standard deviation 1.7 degrees, and was affected by family and by crown asymmetry. Interlocking grain was common, exhibiting a mean amplitude of 3.4 degrees (standard deviation 1.5◦) and a mean wavelength of 39 mm (standard deviation 12 mm). The relatively large amplitude of interlocking grain means that most trees will have spiral grain that alternates between left and right during each year. The wavelength of interlocking grain is influenced by tree size, but amplitude of interlocking is under …