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Search Results: 1 - 10 of 5860 matches for " logging effects "
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Determining effects of an all weather logging road on winter woodland caribou habitat use in south-eastern Manitoba
Doug W. Schindler,David Walker,Tim Davis,Richard Westwood
Rangifer , 2007,
Abstract: The Owl Lake boreal woodland caribou population is the most southerly population in Manitoba. It is provincially ranked as a High Conservation Concern Population. Forestry operations exist in the area and there are plans for further forest harvest and renewal. The Happy Lake logging road is the only main access through the Owl Lake winter range. This logging road is currently closed to the public and access is limited to forestry operations during specific times of the year. An integrated forestry/caribou management strategy for the area provides for the maintenance of minimum areas of functional habitat. Habitat quality along the road was compared to habitat quality in the winter core use areas, within the winter range and outside the winter range. To evaluate the extent of functional habitat near the road, we conducted animal location and movement analysis using GPS data collected from January 2002 to March 2006. Habitat quality in the winter range, core use areas and along the road were assessed and found to be similar. Analysis of caribou locations and movement illustrate less use of high quality habitat adjacent to the Happy Lake Road. Loss of functional habitat is suggested to occur within 1 kilometre of the road. This potential loss of functional habitat should be incorporated into integrated forestry and caribou conservation strategies. Road management is recommended to minimize the potential sensory disturbance and associated impacts of all weather access on boreal woodland caribou.
Efectos del fósforo y carbono lábiles en la fijación no simbiótica de N2 en hojarasca de bosques siempreverdes manejados y no manejados de la Isla de Chiloé, Chile
PéREZ,SANDRA E; PéREZ,CECILIA A; CARMONA,MARTíN R; FARI?A,JOSé M; ARMESTO,JUAN J;
Revista chilena de historia natural , 2008, DOI: 10.4067/S0716-078X2008000200009
Abstract: nitrogen input to evergreen températe forests of chiloé island, chile occurs predominantly via non-symbiotic fixation (nsf). because this is a bacterial-mediated process (diazotrophs), in addition to environmental factors (e.g., temperature and moisture), phosphorous availability and energy supply from carbón in the substrate may influence the rates of n fixation. our hypothesis is that if both phosphorous and carbón are limiting nsf, this limitation would be greater in logged forests, where additions of labile p and c would stimulate microbial activity. our objectives are to assess the effects of inorganic phosphorus and labile carbón (as glucose) additions (0 mmol p/l, 0.645 mmol p/l, 3.23 mmol p/l y 6.45 mmol p/l and 0 mmol p/l, 23.3 mmol c/l, 46.6 mmol c/l y 70 mmol c/l, respectively) on the rates of nsf measured in the litter layer of each forest in laboratory assays, under controlled temperature and moisture and using homogeneous litter samples. we studied lowland evergreen rainforests (100-200 m of altitude), located in the chonchi district, in chiloé island. two forest stands were logged, subjected to industrial and non-industrial selective logging, and the third stand was unlogged (control). the nsf of nitrogen was assessed by the acetylene reduction assay. two-way anovas showed that phosphorous addition had no effect on acetylene reduction rates (arr) in the litter of logged or unlogged forests, but the addition of labile carbón in the form of glucose negatively affected arr when applied at the máximum level to the litter of unlogged forest. in all treatments the factor forest accounted for the differences in arr, which was higher in unlogged forest. these differences were not explained by any of the variables experimentally manipulated in this study. the main difference among forests was floristic composition of litterfall, but litter did not differ among forests in its c/n ratio or total p and n contents.
Plant Species Recovery on a Compacted Skid Road
Murat Demir,Ender Makineci,Beyza Sat Gungor
Sensors , 2008, DOI: 10.3390/s8053123
Abstract: This study was executed to determine the plant species of herbaceous cover in a skid road subjected to soil compaction due to timber skidding in a beech (Fagus orientalis Lipsky.) stand. Our previous studies have shown that ground based timber skidding destroys the soils extremely, and degradations on ecosystem because of the timber skidding limit recovery and growth of plant cover on skid roads. However, some plant species show healthy habitat, recovery and they can survive after the extreme degradation in study area. We evaluated composition of these plant species and their cover-abundance scales in 100 m x 3 m transect. 15 plant species were determined belongs to 12 plant families and Liliaceae was the highest representative plant family. Smilax aspera L., Epimedium pubigerum (DC.) Moren et Decaisne, Carex distachya Desf. var. distachya Desf., Pteridium aquilinum (L.) Kuhn., Trachystemon orientalis (L.) G. Don, Hedera helix L. have the highest coverabundance scale overall of determined species on compacted skid road.
Plant Species Recovery on a Compacted Skid Road
Murat Demir,Ender Makineci,Beyza Sat Gungor
Sensors , 2008,
Abstract: This study was executed to determine the plant species of herbaceous cover in a skid road subjected to soil compaction due to timber skidding in a beech (Fagus orientalis Lipsky.) stand. Our previous studies have shown that ground based timber skidding destroys the soils extremely, and degradations on ecosystem because of the timber skidding limit recovery and growth of plant cover on skid roads. However, some plant species show healthy habitat, recovery and they can survive after the extreme degradation in study area. We evaluated composition of these plant species and their cover-abundance scales in 100 m x 3 m transect. 15 plant species were determined belongs to 12 plant families and Liliaceae was the highest representative plant family. Smilax aspera L., Epimedium pubigerum (DC.) Moren et Decaisne, Carex distachya Desf. var. distachya Desf., Pteridium aquilinum (L.) Kuhn., Trachystemon orientalis (L.) G. Don, Hedera helix L. have the highest coverabundance scale overall of determined species on compacted skid road.
Performance of the Wireline Heave Compensation System Onboard D/V JOIDES Resolution
Gerardo Iturrino,Tanzhuo Liu,David Goldberg,Helen Evans
Scientific Drilling , 2013, DOI: 10.2204/iodp.sd.15.08.2013
Abstract:
Efectos del fósforo y carbono lábiles en la fijación no simbiótica de N2 en hojarasca de bosques siempreverdes manejados y no manejados de la Isla de Chiloé, Chile Effects of labile phosphorous and carbón on non-symbiotic N2 fixation in logged and unlogged evergreen forests in Chiloé Island, Chile
SANDRA E PéREZ,CECILIA A PéREZ,MARTíN R CARMONA,JOSé M FARI?A
Revista chilena de historia natural , 2008,
Abstract: El flujo de entrada de nitrógeno (N) en ecosistemas de bosques templados de la Isla de Chiloé puede ocurrir en una proporción importante vía fijación no simbiótica (FNS). Debido a que este proceso es llevado a cabo por bacterias (diazótrofas) está regulado, además del efecto de factores climáticos (temperatura y humedad), por la disponibilidad de nutrientes, en particular fósforo y carbono como fuentes de energía. Nuestra hipótesis es que si el fósforo y el carbono son limitantes para la FNS, esta limitación se acentuaría en bosques manejados, en donde adición experimental de P y C deberían estimular la actividad microbiana. En este trabajo se determinó los efectos de la adición de cuatro niveles de fósforo inorgánico (0 mmol P/L, 0,645 mmol P/L, 3,23 mmol P/L y 6,45 mmol P/L) y cuatro niveles de carbono lábil como glucosa (0 mmol P/L, 23,3 mmol C/L, 46,6 mmol C/L y 70 mmol C/L), en la FNS de N2 de hojarasca homogenizada de cada bosque, en condiciones controladas de temperatura y humedad, en experimentos de laboratorio. Se estudiaron bosques de zonas bajas (100-200 m de altitud) ubicados en la comuna de Chonchi, Isla de Chiloé. De estos bosques, dos habían sido manejados, uno por corta selectiva y otro por floreo, y el tercero (control) era un bosque antiguo no intervenido. La FNS del nitrógeno se estimó mediante la "técnica de reducción de acetileno". Análisis de varianzas de dos vías mostraron que las adiciones de fósforo no afectaron en forma significativa las tasas de reducción de acetileno (TRA) de la hojarasca en ninguno de los tres bosques, pero la adición de carbono lábil en forma de glucosa afectó negativamente la TRA en el máximo nivel aplicado, en la hojarasca del bosque no manejado. Solo el factor bosque, relacionado a la práctica silvicultural, dio cuenta de las diferencias observadas en las TRA, siendo mayores en el bosque no manejado. Estas diferencias no fueron explicadas por las variables manipuladas experimentalmente. El manejo de bosque afectó la composición florística de la hojarasca, pero no hubo diferencias su relación C/N, ni en los contenidos de N o P totales. Nitrogen input to evergreen températe forests of Chiloé Island, Chile occurs predominantly via non-symbiotic fixation (NSF). Because this is a bacterial-mediated process (diazotrophs), in addition to environmental factors (e.g., temperature and moisture), phosphorous availability and energy supply from carbón in the substrate may influence the rates of N fixation. Our hypothesis is that if both phosphorous and carbón are limiting NSF, this limitation would be greater in logg
Application of Activity and Wavelet Analysis on Well Logging Sedimentary Cycle Division  [PDF]
Xinhu Li, Yuan Guo
Open Journal of Geology (OJG) , 2013, DOI: 10.4236/ojg.2013.32010
Abstract:

The method of sedimentary cycle division is studied based on comprehensive research and activity analysis of well logging, combined with wavelet analysis and characteristics of stratigraphic cycle. Based on the method above, this paper divided stratigraphic cycles and finely classified the tratifigraphic by taking H1518 in HSS oilfield as an example. The result shows that sedimentary cycle can be divided effectively based on key stratum study, activity and wavelet analysis of well log, and the research of sedimentary cycle characteristics. H1 formation can be divided into 1 sand group, 3 sand layers and 7 single layers.

Прогнозирование продолжительности периода разработки зимних лесосек в условиях Республики Коми
Григорьев И.В.,Свойкин Ф.В.
Resources and Technology , 2010, DOI: 1742
Abstract: В статье рассмотрен вопрос перехода температуры воздуха через 0 °С. Дан анализ колебаний годовой температуры воздуха по месяцам. Проанализирован переход температуры воздуха через 0 °С весной и осенью. Рассмотрены вопросы начала и окончания лесосечных работ на зимних лесосеках в средней тайге Республики Коми. Дана методика расчета дат начала и окончания лесосечных работ на зимних лесосеках. Приведена обеспеченность дат начала и окончания лесосечных работ на зимних лесосеках. Приведены критерии технологической надежности технологии лесосечных работ в предлагаемых условиях эксплуатации, технологического обеспечения заданных показателей качества и регламентации эксплуатации технологии. Приведена методика предсказания периода лесосечных работ.
Estimativa de parametros indicadores de qualidade de carv?o a partir de perfilagem geofísica
Webber, Tiago;Salvadoretti, Paulo;Koppe, Jair Carlos;Costa, Jo?o Felipe Coimba Leite;
Rem: Revista Escola de Minas , 2009, DOI: 10.1590/S0370-44672009000300005
Abstract: coal quality is commonly analyzed using cores obtained from diamond drill holes, which are costly and time consuming. geophysical logging provides an indirect measurement of coal quality derived from some physical properties logged by the probe. among the geophysical logging methods, gamma back scattering (gamma-gamma) is appropriate for identifying coal seams and for inferring some coal quality parameters. this study identifies the possible correlation between gamma-gamma readings and ash content. by using the logged geophysical survey values plotted against the ash content, analyzed at the same intervals, a scatter plot was constructed and a model adjusted. the derived model showed a high correlation coefficient and acceptable estimation error, recommending this practice for obtaining quick, low-cost information for mine planning.
Avalia??o de alguns fatores ergon?micos nos tratores "Feller-buncher" e "Skidder" utilizados na colheita de madeira
Lima, Juli?o Soares de Souza;Souza, Amaury Paulo de;Machado, Carlos Cardoso;Oliveira, Rone Batista de;
Revista árvore , 2005, DOI: 10.1590/S0100-67622005000200012
Abstract: this work was carried out in forest tractors used in a mechanized system for wood harvesting in a stand of eucalyptus, to evaluate quanti-qualitatively the dimensions of access, seat, commands, field view, thermal conditions and vibration in the operators' station. the access to the operator's station in the feller-buncher tractor presented a degree of difficulty classified in the qualitative evaluation as average and the skidder as good. the opening of the access doors presents an angle smaller than 90o, thus rendering the entrance and exit of the operator more difficult. the operators station of the feller-buncher tractor was classified as medium in the qualitative evaluation, due to the free space of the support platform being 30% of the total area, and in the skidder 55%, therefore being classified as good. the front field view in feller-buncher, even having a wider windscreen area, is limited by the presence of the headstock in by day as well as by night operations, therefore being smaller than the skidder's.
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