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Articles 1 - 7 of 7
Full-Text Articles in Physical Sciences and Mathematics
Dinamica De Los Bosques De La Llanura Aluvial Inundable De La Amazonia Peruana: Efectos De Las Perturbaciones E Implicancias Para Su Manejo Y Conservacion, Gustav Nebel, Lars Peter Kvist, Jerome K. Vanclay, Hector Vidaurre
Dinamica De Los Bosques De La Llanura Aluvial Inundable De La Amazonia Peruana: Efectos De Las Perturbaciones E Implicancias Para Su Manejo Y Conservacion, Gustav Nebel, Lars Peter Kvist, Jerome K. Vanclay, Hector Vidaurre
Professor Jerome K Vanclay
Forest dynamics was studied from 1993 to 1997 for individuals > 10 cm DBH in nine one-hectare 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 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 2.20-3.16 %/year, recruitment 2.99-4.57 %/year. Dead individuals significantly deviated from …
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 …
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. …
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 …
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 …
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.
Managing Water Use From Forest Plantations, Jerome K. Vanclay
Managing Water Use From Forest Plantations, Jerome K. Vanclay
Professor Jerome K Vanclay
Tree plantations have developed a reputation for excessive water use, with age commonly used as an explanatory variable to predict water loss – but many factors have the potential to affect plantation water use, and few of these alternatives have been considered. Changes in forest cover may be correlated with other environmental changes that may affect precipitation, transpiration, and runoff, indicating that more thorough investigation is required in both field and simulation studies. Several factors influencing water use by plantations are amenable to management control, so there is scope to design and manage forest plantations deliberately for water use efficiency. …