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Articles 1 - 8 of 8
Full-Text Articles in Life Sciences
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. …
Responses Of Plants In Polar Regions To Uvb Exposure : A Meta-Analysis, K. K. Newsham, Sharon A. Robinson
Responses Of Plants In Polar Regions To Uvb Exposure : A Meta-Analysis, K. K. Newsham, Sharon A. Robinson
Sharon Robinson
We report a meta-analysis of data from 34 field studies into the effects of UV-B radiation on Arctic and Antarctic bryophytes and angiosperms. The studies measured plant responses to decreases in UV-B radiation under screens, natural fluctuations in UV-B irradiance, or increases in UV-B radiation applied from fluorescent UV lamps. Exposure to UV-B radiation was found to increase the concentrations of UV-B absorbing compounds in leaves or thalli by 7% and 25% (expressed on a mass or area basis, respectively). UV-B exposure also reduced aboveground biomass and plant height by 15% and 10%, respectively, and increased DNA damage by 90%. …
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. …
Modeling The Status And Threats To The Philippine Eagle In The Eastern Mindanao Biodiversity Corridor, Vicente Calag, Sean Fitzgerald, James Hafner, Jayson Ibanez, Alicia Johnson, Don Sluter
Modeling The Status And Threats To The Philippine Eagle In The Eastern Mindanao Biodiversity Corridor, Vicente Calag, Sean Fitzgerald, James Hafner, Jayson Ibanez, Alicia Johnson, Don Sluter
James A Hafner
The Philippines is among the most endemic-rich areas for all global biodiversity hotspots. Conserving that biodiversity presents multi-scaled challenges including the critical need for habitat and species level documentation as a basis for identifying conservation targets. This paper contributes to that need by describing the use of A Composite Bio-geographic Analysis (CBA) model to model the dynamics and inter-relationships between species distribution, nest, habitat and land use change, population distribution and access to the PA and to synthesize and evaluate data on the status and threats to the Philippine Eagle Pithecophaga jefferyi in the Mt. Hamiguitan Protected Area, one of …
Fundamentals For Using Geographic Information Science To Measure The Effectiveness Of Land Conservation Projects, Robert G. Pontius Jr., Shaily Menon, Joseph Duncan, Shalini Gupta
Fundamentals For Using Geographic Information Science To Measure The Effectiveness Of Land Conservation Projects, Robert G. Pontius Jr., Shaily Menon, Joseph Duncan, Shalini Gupta
Shaily Menon
Some humans spend a tremendous amount of effort to change landscapes from a “natural” state to a “developed” state for a variety of desirable economic uses, such as urban, agriculture, transportation, and mining. Others spend a tremendous amount of effort to prevent such development in order to conserve the landscapes for a variety of important environmental uses, such as biodiversity maintenance, carbon storage, water filtration, and landslide prevention. It would be efficient in theory if a society were to focus its development efforts at locations that give the largest economic utility per area developed, and to focus its conservation efforts …