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Tree height integrated into pantropical forest biomass estimates

Feldpausch, T. R.; Lloyd, J.; Lewis, S. L.; Brienen, R. J. W.; Gloor, M.; Monteagudo Mendoza, A.; Lopez-Gonzalez, G.; Banin, L.; Abu Salim, K.; Affum-Baffoe, K.; Alexiades, M.; Almeida, S.; Amaral, I.; Andrade, A.; Aragao, L. E. O. C.; Araujo Murakami, A.
Fonte: COPERNICUS GESELLSCHAFT MBH; GOTTINGEN Publicador: COPERNICUS GESELLSCHAFT MBH; GOTTINGEN
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
56.6%
Aboveground tropical tree biomass and carbon storage estimates commonly ignore tree height (H). We estimate the effect of incorporating H on tropics-wide forest biomass estimates in 327 plots across four continents using 42 656 H and diameter measurements and harvested trees from 20 sites to answer the following questions: 1. What is the best H-model form and geographic unit to include in biomass models to minimise site-level uncertainty in estimates of destructive biomass? 2. To what extent does including H estimates derived in (1) reduce uncertainty in biomass estimates across all 327 plots? 3. What effect does accounting for H have on plot- and continental-scale forest biomass estimates? The mean relative error in biomass estimates of destructively harvested trees when including H (mean 0.06), was half that when excluding H (mean 0.13). Power- and Weibull-H models provided the greatest reduction in uncertainty, with regional Weibull-H models preferred because they reduce uncertainty in smaller-diameter classes (< 40 cm D) that store about one-third of biomass per hectare in most forests. Propagating the relationships from destructively harvested tree biomass to each of the 327 plots from across the tropics shows that including H reduces errors from 41.8 Mg ha(-1) (range 6.6 to 112.4) to 8.0 Mg ha(-1) (-2.5 to 23.0).; NERC; NERC; Henrietta Hutton Grant (RGSIBG); Henrietta Hutton Grant (RGS-IBG); European Research Council; European Research Council; Royal Society University Research Fellowship; Royal Society University Research Fellowship; NERC New Investigator Award (AfriTRON); NERC New Investigator Award (AfriTRON); NERC AMAZONICA; NERC AMAZONICA; EScFund grant of the Malaysian Ministry of Science...

Real-time sampling of particulate matter smaller than 2.5 mu m from Amazon forest biomass combustion

Costa, M. A. M.; Carvalho, J. A.; Soares Neto, T. G.; Anselmo, E.; Lima, B. A.; Kura, L. T. U.; Santos, J. C.
Fonte: Pergamon-Elsevier B.V. Ltd Publicador: Pergamon-Elsevier B.V. Ltd
Tipo: Artigo de Revista Científica Formato: 480-489
ENG
Relevância na Pesquisa
56.42%
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); Processo FAPESP: 08/04490-4; Particle size distribution from forest biomass combustion is an important parameter as it affects air quality, global climate and human health. There have been several studies that relate emission of 2.5-10 mu m particulates and their effects on human health. The objective of this study was to sample particulates smaller than 2.5 mu m from Amazon forest biomass burning in laboratory and field experiments. Sampling was carried out using three instruments: two DataRAM 4 (model DR 4000) and a Cascade Impactor. Isokinetic probes were used for sampling in the stacks, and an omnidirectional instrument was used for field sampling. The field experiment was conducted in a 4 ha Amazon forest test site in the state of Acre, in Brazil. Ignition, flaming and smoldering combustion phases were analyzed. Results were obtained in terms of particle size distribution and concentration. Comparison of laboratory and field experiments showed that particle size distributions were similar in both cases. Particle sizes obtained in the laboratory ranged from 0.05 to 0.8 mu m; in the field experiment, sizes varied from 0.03 to 0.3 mu m. Average concentrations in the laboratory and in the field were 185 mg m(-3) and 350 mg m(-3)...

Comparative study for hardwood and softwood forest biomass: Chemical characterization, combustion phases and gas and particulate matter emissions

Amaral, Simone Simoes; Carvalho Junior, Joao Andrade de; Martins Costa, Maria Angelica; Soares Neto, Turibio Gomes; Dellani, Rafael; Scavacini Leite, Luiz Henrique
Fonte: Elsevier B.V. Publicador: Elsevier B.V.
Tipo: Artigo de Revista Científica Formato: 55-63
ENG
Relevância na Pesquisa
66.47%
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); Processo FAPESP: 08/04490-4; Two different types of typical Brazilian forest biomass were burned in the laboratory in order to compare their combustion characteristics and pollutant emissions. Approximately 2 kg of Amazon biomass (hardwood) and 2 kg of Araucaria biomass (softwood) were burned. Gaseous emissions of CO2, CO, and NOx and particulate matter smaller than 2.5 mu m (PM2.5) were evaluated in the flaming and smoldering combustion phases. Temperature, burn rate, modified combustion efficiency, emissions factor, and particle diameter and concentration were studied. A continuous analyzer was used to quantify gas concentrations. A DataRam4 and a Cascade Impactor were used to sample PM2.5. Araucaria biomass (softwood) had a lignin content of 34.9%, higher than the 23.3% of the Amazon biomass (hardwood). CO2 and CO emissions factors seem to be influenced by lignin content. Maximum concentrations of CO2, NOx and PM2.5 were observed in the flaming phase. (C) 2014 Elsevier Ltd. All rights reserved.

Real-time Sampling of Particulate Matter Smaller than 2.5 µm from Amazon Forest Biomass Combustion

Costa, Maria Angélica Martins; Carvalho Júnior, João Andrade de; Soares Neto, Turíbio gomes; Anselmo, Edson; Santos, José Carlos Dos; LIma, Bruno de Araújo
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica Formato: 480-489
ENG
Relevância na Pesquisa
56.42%
Particle size distribution from forest biomass combustion is an important parameter as it affects air quality, global climate and human health. There have been several studies that relate emission of 2.5e10 mm particulates and their effects on human health. The objective of this study was to sample particulates smaller than 2.5 mm from Amazon forest biomass burning in laboratory and field experiments. Sampling was carried out using three instruments: two DataRAM 4 (model DR 4000) and a Cascade Impactor. Isokinetic probes were used for sampling in the stacks, and an omnidirectional instrument was used for field sampling. The field experiment was conducted in a 4 ha Amazon forest test site in the state of Acre, in Brazil. Ignition, flaming and smoldering combustion phases were analyzed. Results were obtained in terms of particle size distribution and concentration. Comparison of laboratory and field experiments showed that particle size distributions were similar in both cases. Particle sizes obtained in the laboratory ranged from 0.05 to 0.8 mm; in the field experiment, sizes varied from 0.03 to 0.3 mm. Average concentrations in the laboratory and in the field were 185 mg m 3 and 350 mg m 3 , respectively. It is important to emphasize that those results were obtained throughout the burning process and the diameters sampled were smaller than 2.5 mm.

Forest biomass waste combustion in a pilot-scale bubbling fluidised bed combustor

Tarelho, Luís António da Cruz; Neves, Daniel Santos Félix; Matos, Manuel Arlindo Amador
Fonte: Elsevier Publicador: Elsevier
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
56.41%
Combustion experiments of forest biomass waste in a pilot-scale bubbling fluidised bed combustor were performed under the following conditions: i) bed temperature in the range 750e800 C, ii) excess air in the range 10e100%, and iii) air staging (80% primary air and 20% secondary air). Longitudinal pressure, temperature and gas composition profiles along the reactor were obtained. The combustion progress along the reactor, here defined as the biomass carbon conversion to CO2, was calculated based on the measured CO2 concentration at several locations. It was foundthat 75e80%of the biomass carbonwasconverted toCO2 in the region located belowthe freeboard first centimetres, that is, the region that includes the bed and the splash zone. Based on the CO2 and NO concentrations in the exit flue gas, it was found that the overall biomass carbon conversion to CO2 was in the range 97.2e99.3%, indicating high combustion efficiency, whereas the biomass nitrogen conversion to NO was lower than 8%. Concerning the Portuguese regulation about gaseous emissions from industrial biomass combustion, namely, the accomplishment of CO, NO and volatile organic compounds (VOC) (expressed as carbon) emission limits, the set of adequate operating conditions includes bed temperatures in the range 750 Ce800 C...

Assessment of forest biomass for use as energy. GIS-based analysis of geographical availability and locations of wood-fired power plants in Portugal

Viana, H.; Cohen, Warren B.; Lopes, D.; Aranha, J.
Fonte: Instituto Politécnico de Viseu Publicador: Instituto Politécnico de Viseu
Tipo: Artigo de Revista Científica
Publicado em //2010 POR
Relevância na Pesquisa
56.39%
Following the European Union strategy concerning renewable energy (RE), Portugal established in their national policy programmes that the production of electrical energy from RE should reach 45% of the total supply by 2010. Since Portugal has large forest biomass resources, a significant part of this energy will be obtained from this source. In addition to the two existing electric power plants, with 22 MW of power capacity, 13 new power plants having a total of 86.4 MW capacity are in construction. Together these could generate a combination of electrical and thermal energy, known as combined heat and power (CHP) production. As these power plants will significantly increase the exploitation of forests resources, this article evaluates the potential quantities of available forest biomass residue for that purpose. In addition to examining the feasibility of producing both types of energy, we also examine the potential for producing only electric energy. Results show that if only electricity is generated some regions will need to have alternative fuel sources to fulfil the demand. However, if cogeneration is implemented the wood fuel resource will be sufficient to fulfill the required capacity demand.

Influence of storage time on the quality of biomass for energy production in humid subtropical regions

Brand,Martha Andreia; Muñiz,Graciela Inês Bolzon de; Quirino,Waldir Ferreira; Brito,José Otávio
Fonte: UFLA - Universidade Federal de Lavras Publicador: UFLA - Universidade Federal de Lavras
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/12/2010 EN
Relevância na Pesquisa
56.31%
This work aims to determine an optimal storage time of forest biomass for use in energy production, through analysis of variations in physical and chemical properties of with bark timber over the storage period. The study was conducted in the municipality of Lages, SC, over a span of 18 months. The experiment used with bark logs of Pinus taeda and Eucalyptus dunnii, with varying diameters, and slabs of Pinus spp., stored in piles. The material was sampled freshly harvested (control), after two, after four and after six months of storage. Four lots were used, harvested and stored at the spring, summer, autumn and winter seasons. Properties being assessed included moisture content (wet basis), gross calorific value, net calorific value and ash content. Results demonstrated that storage time influenced moisture content and net calorific value, yet it had no influence on gross calorific value and ash content. Optimal storage time ranged from two to four months, depending on the species, form of biomass and storage season. The best behavior regarding quality after storage was from Pinus slabs, followed by Eucalyptus logs and Pinus logs, the latter showing the worst behavior.

Tree height and tropical forest biomass estimation.

HUNTER, M. O.; KELLER, M.; VICTORIA, D. de C.; MORTON, D. C.
Fonte: Biogeosciences, v. 10, p. 10491-10529, 2013. Publicador: Biogeosciences, v. 10, p. 10491-10529, 2013.
Tipo: Artigo em periódico indexado (ALICE) Formato: p. 10491-10529.
EN
Relevância na Pesquisa
56.57%
Tropical forests account for approximately half of above-ground carbon stored in global vegetation. However, uncertainties in tropical forest carbon stocks remain high because it is costly and laborious to quantify standing carbon stocks. Carbon stocks of tropi-5 cal forests are determined using allometric relations between tree stem diameter and height and biomass. Previous work has shown that the inclusion of height in biomass allometries, compared to the sole use of diameter, significantly improves biomass estimation accuracy. Here, we evaluate the effect of height measurement error on biomass estimation and we evaluate the accuracy of recently published diameter : height allome10 tries at four sites within the Brazilian Amazon. As no destructive sample of biomass was available at these sites, reference biomass values were based on allometries.We found that the precision of individual tree height measurements ranged from 3 to 20% of total height. This imprecision resulted in a 5?6% uncertainty in biomass when scaled to 1 ha transects. Individual height measurement may be replaced with existing regional 15 and global height allometries. However, we recommend caution when applying these relations. At Tapajós National Forest in the Brazilian state of Pará...

Biomass production and mineral element supply of selected useful tropical plants.

SCHMIDT, P.; LIEBEREI, R.; PREISINGER, H.; BAUCH, J.; GASPAROTTO, L.
Fonte: In: IUFRO WORLD CONGRESS, 20., 1995, Tampere. Caring for the forest: research in a changing world - poster abstracts. Tampere: IUFRO, 1995. p. 11. Publicador: In: IUFRO WORLD CONGRESS, 20., 1995, Tampere. Caring for the forest: research in a changing world - poster abstracts. Tampere: IUFRO, 1995. p. 11.
Tipo: Resumo em anais de congresso (ALICE)
EN
Relevância na Pesquisa
56.34%
This current investigation is part of a cooperative project of CPAA-Manaus and Hamburg University entitled "Recultivation of degraded and abandoned monocultures instable mixed cultures with special reference to soil biological factors". In this study the biomass product and the mineral element supply of selected useful tropical plants will be determined. Parallel to it the availability of nutrient element in the soil will be analyzed. These experiments may allow an evaluation, in which way a sustainable growth of the suggested plant system under the prevailing site conditions is possible.; 1995; Poster 11.

Influence of storage time on the quality of biomass for energy production in humid subtropical regions; Influência do tempo de estocagem na qualidade da biomassa para energia em regiões subtropicais úmidas

Fonte: UFLA - Universidade Federal de Lavras Publicador: UFLA - Universidade Federal de Lavras
Tipo: Artigo de Revista Científica Formato: text/html
EN
Relevância na Pesquisa
56.31%
This work aims to determine an optimal storage time of forest biomass for use in energy production, through analysis of variations in physical and chemical properties of with bark timber over the storage period. The study was conducted in the municipality of Lages, SC, over a span of 18 months. The experiment used with bark logs of Pinus taeda and Eucalyptus dunnii, with varying diameters, and slabs of Pinus spp., stored in piles. The material was sampled freshly harvested (control), after two, after four and after six months of storage. Four lots were used, harvested and stored at the spring, summer, autumn and winter seasons. Properties being assessed included moisture content (wet basis), gross calorific value, net calorific value and ash content. Results demonstrated that storage time influenced moisture content and net calorific value, yet it had no influence on gross calorific value and ash content. Optimal storage time ranged from two to four months, depending on the species, form of biomass and storage season. The best behavior regarding quality after storage was from Pinus slabs, followed by Eucalyptus logs and Pinus logs, the latter showing the worst behavior.

Canopy Height Modeling for Improved Forest Biomass Inventory

Benzie, Alexandra
Fonte: Quens University Publicador: Quens University
Tipo: Project
EN
Relevância na Pesquisa
66.62%
In Ontario, an up-to-date forest biomass inventory is critical for forest management decisions and to ensure sustainable development. Due to recent pressures of climate change, economic downturns, and rising energy prices, inventory users are demanding increasingly accurate, timely, and spatially explicit biomass data from producers. This study focuses specifically on the inventory measurement of forest height, as height is an important yet elusive variable for determining biomass quality and quantity, along with a myriad of other forest and ecological attributes. Two types of remote sensing methods are used to model height, Light Detection and Ranging (LiDAR) and Semi Global Matching (SGM), at the privately owned Haliburton Forest in the Great Lakes St. Lawrence. The modeled heights are then compared to height data found in Ontario’s Forest Resource Inventory (FRI), collected using stereo-photogrammetry and ground surveys by Ontario’s Ministry of Natural Resources. Three different stand scenarios, representing various plot characteristics, are used to determine if correlations between LiDAR, SGM and the FRI increase as plot variables are constrained. Throughout the study, height values modeled by LiDAR and SGM are strongly correlated (R2 up to .88 for maximum height...

Forests, Biomass Use and Poverty in Malawi

Bandyopadhyay, Sushenjit; Shyamsundar, Priya; Baccini, Alessandro
Fonte: World Bank, Washington, DC Publicador: World Bank, Washington, DC
Relevância na Pesquisa
46.7%
In this paper, the authors seek to answer three questions about poverty and forests in Malawi: (1) What is the extent of biomass available for meeting the energy needs of the poor in Malawi and how is this distributed? (2) To what extent does fuelwood scarcity affect the welfare of the poor? (3) How do households cope with scarcity? In particular, do households spend more time in fuelwood collection and less time in agriculture in response to scarcity? The authors attempt to answer these questions using household and remote-sensing data. They find that 80 percent of rural poor households in Malawi are likely to benefit from an increase in biomass per hectare in their community. Rural women respond to biomass scarcity by increasing the time they spend on fuelwood collection. But the actual decrease in consumption expenditure and increase in time in fuelwood collection are small and biomass scarcity is not associated with a reduction in agricultural labor supply.

Tree height integrated into pantropical forest biomass estimates

FELDPAUSCH Ted; LLOYD J; BRIENEN R; LEWIS S; GLOOR E; MONTEAGUDO A; LOPEZ-GONZALEZ G; BANIN L; ABU SALIM K; ALEXIADES M; ALMEIDA S; AMARAL I; ANDRADE Ana; ARAGAO L. E. O. C.; MURAKAMI A; ARETS E. J. M. M.; ARROYO L; AYMARD G; BAKER T; BANKI O; BERRY N. J.
Fonte: COPERNICUS GESELLSCHAFT MBH Publicador: COPERNICUS GESELLSCHAFT MBH
Tipo: Articles in Journals Formato: Printed
ENG
Relevância na Pesquisa
46.67%
Pantropical above-ground tree biomass and carbon estimates commonly lack integrated height (H) to parameterise estimates to local forest allometry. Using height (H):diameter (D) models derived from a new tree architecture database (n=43,000 concomitant H and D measurements), we here provide a first pantropical evaluation of the effects of incorporating H on forest biomass estimates by geographic locale (plot, region, and continent). We examine the following questions: 1) Which is the best H-model form and geographic scale to include in biomass models to significantly reduce tree-by-tree uncertainty in estimates of destructive biomass? 2) How much does including height reduce uncertainty in plot-level forest biomass estimates tropics-wide? 3) How does inclusion of H in biomass estimates modify pantropical plot-level and continental-scale estimates of forest biomass? We compiled published and unpublished pantropical destructively sampled biomass data, and permanent sample plot data. Together with our tropical tree H database these were used to evaluate the effect of H on estimating biomass of real (destructively) sampled data (n=21 plots; 1816 trees) and on estimating biomass in permanent forest sample plots (n=327) across the tropics. Inclusion of H in biomass models significantly alters biomass estimates relative to estimates based on D+ρW (wood specific gravity) alone. The mean relative error in biomass estimates across diameter classes when including H was half (mean 0.06) that when excluding H (mean 0.13). The power- and Weibull-H asymptotic model provided the greatest reduction in uncertainty. We show fundamentally different stand structure across the four forested tropical continents. African forests store a greater portion of total biomass in large-diameter trees and trees are on average larger in diameter. This contrasts to forests on all other continents where smaller-diameter trees contain the greatest fractions of total biomass. Total biomass per hectare is greatest in Australia...

A European map of living forest biomass and carbon stock - Executive report

BARREDO CANO JOSE IGNACIO; SAN-MIGUEL-AYANZ Jesus; CAUDULLO GIOVANNI; BUSETTO LORENZO
Fonte: Publications Office of the European Union Publicador: Publications Office of the European Union
Tipo: EUR - Scientific and Technical Research Reports Formato: Online
ENG
Relevância na Pesquisa
46.69%
Forest ecosystems have a key role in the global carbon cycle and are considered large and persistent carbon sinks. The CO2 fixed by photosynthesis is one of the most important components of the carbon cycle, and forests play a determinant role in this process. Therefore, spatially explicit data and assessments of forest biomass and carbon is of paramount importance for the design and implementation of effective sustainable forest management options and forest related policies at the European level. The aim of this report is to present a summary of early results of the FOREST Action activities on forest biomass and carbon stock in Europe. In this report we present European-wide maps of forest biomass and carbon stock at IPCC Tier 1 level. Maps of forest biomass and carbon stock are relevant for quantifying terrestrial carbon storage and carbon sinks as well as for estimating potential emissions from land cover changes (afforestation, deforestation, reforestation), forest fragmentation and biotic (pests) and abiotic (e.g. forest fires, windstorms) disturbances. We describe the input data and approach, then present a summary examining the potential of the approach and further work as well as data needs in this field. The maps presented...

Developing a spatially-explicit pan-European dataset of forest biomass increment

BUSETTO LORENZO; BARREDO CANO JOSE IGNACIO; SAN-MIGUEL-AYANZ Jesus
Fonte: European Biomass Conference Publicador: European Biomass Conference
Tipo: Contributions to Conferences Formato: Online
ENG
Relevância na Pesquisa
56.47%
The aim of our work was the development of a methodology for the spatial assessment of forest biomass increment at the pan-European level. To this aim, we used MODIS GPP data (NASA Product MOD17A3) adjusted with GPP data derived from upscaling of FLUXNET observations using the Model Tree Ensemble (MTE) technique (Jung et al., 2011) to derive a 1 km resolution biomass increment map. This map was then validated using regional information from the most recent National Forest Inventories of several countries, highlighting a good agreement between estimated and observed data. The resulting map can serve as a useful baseline for a number of applications dealing with potential supply of energy from forest in Europe, including mobilisation scenarios that consider current environmental, technical and social constraints.; JRC.H.3-Forest Resources and Climate

Using stated preference methods to assess environmental impacts of forest biomass power plants in Portugal

Botelho, Anabela; Gomes, Lina Lourenço; Pinto, Lígia; Sousa, Sara; Valente, Marieta
Fonte: Universidade do Minho. Núcleo de Investigação em Microeconomia Aplicada Publicador: Universidade do Minho. Núcleo de Investigação em Microeconomia Aplicada
Tipo: Trabalho em Andamento
Publicado em /11/2015 ENG
Relevância na Pesquisa
66.63%
As a renewable energy source, the use of forest biomass for electricity generation is advantageous in comparison with fossil fuels, however the activity of forest biomass power plants causes adverse impacts, affecting particularly neighbouring communities. The main objective of this study is to estimate the effects of the activity of forest biomass power plants on the welfare of two groups of stakeholders, namely local residents and the general population and we apply two stated preference methods: contingent valuation and discrete choice experiments, respectively. The former method was applied to estimate the minimum compensation residents of neighbouring communities of two forest biomass power plants in Portugal would be willing to accept. The latter method was applied among the general population to estimate their willingness to pay to avoid specific environmental impacts. The results show that the presence of the selected facilities affects individuals’ well-being. On the other hand, in the discrete choice experiments conducted among the general population all impacts considered were significant determinants of respondents’ welfare levels. The results of this study stress the importance of performing an equity analysis of the welfare effects on different groups of stakeholders from the installation of forest biomass power plants...

Preparation and characterization of adsorbents/catalysts from forest biomass fly ash

Girón, R. P.; Gil, R. R.; Suárez Ruiz, Isabel; García Suárez, Ana Beatriz; Fuente Alonso, Enrique
Fonte: Conselho Superior de Investigações Científicas Publicador: Conselho Superior de Investigações Científicas
Tipo: Comunicación de congreso Formato: 206077 bytes; application/pdf
ENG
Relevância na Pesquisa
56.26%
En: 1st Spanish National Conference on Advances in Materials Recycling and Eco – Energy Madrid, 12-13 November 2009.-- Editors: F. A. López, F. Puertas, F. J. Alguacil and A. Guerrero.-- 4 pages, 2 figures, 4 tables.; This paper deals with the production of materials, known as adsorbents/catalysts, from forest biomass fly ashes. The ashes were subjected to different pre-treatments to generate two kinds of precursors. Via an agglomerative process using domestic residual oils and a dry sieving method. Both precursors, after an activation process using potassium hydroxide, were characterized in terms of BET surface area. The adsorbent/catalyst obtained from the precursor subjected to dry sieving exhibited a developed porosity, which in turn gave rise to surface areas in the range of 2000m2/g.; The group is grateful to ENCE-Navia for financial support under the project PRI-ASTURIAS, PC07-015, 2007-2009.; Peer reviewed

Integrated sustainability analysis of innovative uses of forest biomass. Bio-oil as an energy vector

Puy Marimon, Neus
Fonte: [Barcelona] : Universitat Autònoma de Barcelona, Publicador: [Barcelona] : Universitat Autònoma de Barcelona,
Tipo: Tesis i dissertacions electròniques; info:eu-repo/semantics/doctoralThesis; info:eu-repo/semantics/publishedVersion Formato: application/pdf
Publicado em //2011 ENG
Relevância na Pesquisa
46.68%
Aquesta investigació ofereix un enfocament multidisciplinari, des d'un punt de vista ambiental, social, econòmic i tecnològic, per a estudiar nous usos de la biomassa forestal utilitzant diferents metodologies, com són els grups de discussió, l'anàlisi del cicle de vida i experimental en una planta pilot de piròlisi. En primer lloc, es realitza una avaluació integrada per mitjà de grups de discussió per a identificar les barreres polítiques, socials i ambientals que han impedit que els sistemes integrats de biomassa forestal hagin continuat desenvolupant‐se en el context mediterrani. Els resultats mostren que, tot i les grans oportunitats i apostes per aquests sistemes, és necessari considerar factors socioecològics específics, com ara els règims de propietat, la baixa productivitat dels boscos mediterranis, la feble capacitat institucional, logística i dificultats d'abastament i la falta de rendibilitat econòmica dels productes forestals, si la biomassa forestal ha de contribuir decisivament a la producció de fonts d'energia renovables a Europa. En segon lloc, es duu a terme una anàlisi del cicle de vida d'una planta de gasificació de biomassa forestal i de fusta de post‐consum. Aquest estudi mostra que la biomassa forestal necessita majors requeriments d'energia...

Estimating forest biomass using satellite radar: an exploratory study in a temperate Australian Eucalyptus forest

Austin, J; Mackey, Brendan; Van Niel, Kimberly
Fonte: Elsevier Publicador: Elsevier
Tipo: Artigo de Revista Científica
Relevância na Pesquisa
56.54%
A study was undertaken to explore the relationship between backscattering coefficients from a Japanese Earth Resources Satellite synthetic aperture radar (JERS-1 SAR) image and aboveground biomass sampled at 12 field plots located in Murramarang National

Thermal behaviour of forest biomass drying in a mechanically agitated fluidized bed

Moreno,R. M.; Antolín,G.; Reyes,A.
Fonte: Latin American applied research Publicador: Latin American applied research
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/04/2007 EN
Relevância na Pesquisa
56.34%
The results obtained in the analysis of the thermal behaviour of a forest biomass fluidized bed dryer with mechanical agitation, are reported. The study is carried out in a pilot size experimental equipment in batch operation. By means of Taguchi's techniques the specific consumption of energy and the rates of evaporation of water and production of dry biomass are analyzed based on the control factors (agitation speed, temperature of operation, superficial velocity and product load into the dryer). As noise factor the initial moisture content of the biomass was considered. The results of the study reveal that the drying process is obtained with a specific consumption of energy of 3040 kJ/kg and a thermal efficiency of 80%.