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Registros recuperados: 548
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A contribuição da biomassa da vegetação secundária na fertilidade do solo. Repositório Alice
WANDELLI, E. V.; SOUSA, S. G. A. de; MATOS, J. C. de S.; PERIN, R.; FERNANDES, E. C. M.; McKERROW, A..
Avaliacao do potencial de contribuicao da conversao da biomassa da vegetacao secundaria em cinzas, pelo metodo de derruba e queima, em Manaus-AM (Brasil). Com base nos resltados, foi verificado que a biomassa da vegetacao secundaria em solos acidos e degradados, quando convertida em cinzas, nao aumenta o status nutricional do solo; o que sugere uso de praticas de manejo da biomassa da capoeira como alternativa para a derruba e queima. Por exemplo, que a biomassa seja utilizada como cobertura morta ou que as capoeiras sejam enriquecidas com especies de valor economico.
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Agrofloresta; Brasil; Amazonas; Manaus; Reclamation; Biomassa; Capoeira; Cobertura do Solo; Desmatamento; Deterioração do Solo; Essência Florestal; Floresta Tropical Úmida; Queimada; Recuperação do Solo; Reflorestamento; Agroforestry; Biomass; Burning; Deforestation; Environmental degradation; Fallow; Forest trees; Reforestation; Tropical rain forests.
Ano: 1996 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/669890
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A Global Model for Agriculture and Bioenergy: Application to Biofuel and Food Security in Peru and Tanzania AgEcon
Elbehri, Aziz; McDougall, Robert; Horridge, Mark.
This paper describes a global model for agriculture and bioenergy (GLOMAB) that incorporates biomass, biofuels and bioelectricity sectors into the GTAP-Energy model by expanding the global GTAP database, production and consumption structures. Biofuels are separated between first- generation (sugar ethanol, starch ethanol) and second- generation (cellulosic ethanol) biofuels and associated biomass feedstocks (maize, sugar cane, crop residues, woody biomass). Beside biofuels, the model also incorporates bioelectricity (as separate form conventional electricity) which competes for the same biomass feedstocks with cellulosic ethanol sector (agricultural residues, woody biomass). With this broad-based representation of the bioenergy system likely to prevail...
Tipo: Conference Paper or Presentation Palavras-chave: Biofuels; Renewable Energy; Biomass; Agricultural Markets; Computable General Equilibrium (CGE); Food Security and Poverty; Resource /Energy Economics and Policy; C68; Q18; Q42; R14.
Ano: 2009 URL: http://purl.umn.edu/51914
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A megújuló energiaforrások szerepe és hatásai a hazai agrárgazdaságban AgEcon
Magda, Robert.
Összességében megállapítható, hogy Magyarországon az elmúlt fél évszázadban rendkívül megnőtt az energiafelhasználás, ami többnyire a fosszilis tüzelőanyagokból nyert energiára alapult. Ez arra készteti a jelen és a jövő kor társadalmát, hogy törekedjen a rendelkezésre álló megújuló energiaforrások felhasználásának előtérbe helyezésére, melyek használata a fenntarthatóság és a versenyképesség szempontjából sem elhanyagolható, hiszen ismert, hogy napjaink egyik kritikus költségtényezőjét adják az energiaköltségek. A megoldásban jelentős szerep hárul a vidéki társadalmakra, mert hiába történik az energiafelhasználás zöme az urbanizált területeken, az energia-előállítás, kitermelés a vidékre koncentrálódik. A fosszilis tüzelőanyagok korlátaiból adódóan új...
Tipo: Article Palavras-chave: Energiafüggőség; Megújuló energiahordozók; Biomassza; Foglalkoztatás; Energy dependence; Renewable energy; Biomass; Employment; Community/Rural/Urban Development; Labor and Human Capital.
Ano: 2011 URL: http://purl.umn.edu/119936
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A mezőgazdaságban keletkező biomassza energetikai hasznosításának agrárgazdasági megközelítése AgEcon
Molnar, Andras.
A gazdálkodás ökonómiai kérdéseivel foglalkozók számára a piaci csere híján fontos feladat az externáliák minél szélesebb körű számszerűsítése, mivel csak a társadalom számára jelentkező összes költség és haszon figyelembevételével lehet megítélni a mindenkori agrárpolitikát. Egyre fontosabb az, hogy milyen agrárpolitikai eszközökkel oldhatók meg a liberalizált kereskedelemmel szembeni elvárások és a nem-termék jellegű javak társadalmilag optimális kibocsátása. Ebben a kettős elvárásban a földtulajdon és földhasználat szétválása előnytelen. ------------------------------------------- In the absence of exchange in the market, researchers into economic aspects of farming place a high emphasis on quantifying externalities to the maximum extent possible....
Tipo: Journal Article Palavras-chave: Externáliák; Biomassza; Energetikai felhasználás; Földhasználat; Méret-; Skála- és választékgazdaságosság; Externalities; Biomass; Use for energy production; Land use; Economies of scale; Volume and choice; Agricultural and Food Policy; Crop Production/Industries; Environmental Economics and Policy.
Ano: 2009 URL: http://purl.umn.edu/92533
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A seasonally varying biotope at Signy Island, Antarctic: implications for meiofaunal structure OMA
Vanhove, S.; Beghyn, M.; Van Gansbeke, D.; Bullough, L.W.; Vincx, M..
Under the typical high-latitude conditions of temperature, productivity and settlement of chlorophyll and phaeophytin to the sediment, many benthic organisms in the Antarctic show strong seasonal variation. Although meiofauna comprise an important component of the southpolar benthic ecosystem, our knowledge of them is limited. The metazoan meiofauna and the surrounding sediments were studied fortnightly for 18 mo in a shallow bay at Signy Island (Factory Cove, South Orkneys, Antarctica) to test whether and how the temporal variability of the environment influenced meiobenthos dynamics. By examination of the distribution of the abundance and biomass of the total community, the density of higher taxonomic groups, and of individual dominant nematode genera...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Benthos; Biomass; Population density; Seasonal variations; Sediment analysis; Trophic relationships; Copepoda [copepods]; Nematoda [Nematodes]; Ostracoda.
Ano: 2000 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=6138
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A simulation of larch forest dynamics associated with fire in northern Mongolia OAK
Taki, S.; Nobori, Y.; Lopez, C.M.L; Takeda, K.; Ishida, S.; Mizota, C..
Palavras-chave: Biomass; Forest dynamics; Larch forest; Tree ring analysis; Yield-Number curve.
Ano: 2013 URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3910
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A transboundary study of the pelagic fish stocks of southern OceanDocs
Krakstad, Jens-Otto; Amaro, Aristóteles P. da S.; Shigwedha, Vaino.
The main objectives of the survey were the following: • To map the distribution and estimate the abundance of the most commercially important pelagic species in the Namibia-Angola transboundary area (15°50-19°00’), following the survey design utilized in Angolan waters (6 n.mi spacing between transect lines), with special emphasis on the two horse mackerel Cunene horse mackerel (Trachurus trecae) and Cape horse mackerel (Trachurus capensis), sardine “Pilchard” (Sardinops sagax) and other small pelagic species, including anchovy (Engraulis capensis) and round herring (Etrumeus whiteheadi). • To map the distributions and estimate the abundance of the same species in central Namibia south to Dune Point (20°15’ S), following the established survey design with...
Tipo: Report Palavras-chave: Pelagic fisheries; Fishery surveys; Acoustics; Sampling; Trawls; Oceanography; Biomass; Distribution; Composition.
Ano: 2012 URL: http://hdl.handle.net/1834/5230
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Abondance relative et estimation de la biomasse des petits pélagiques des eaux tunisiennes OceanDocs
Ben Abdallah, L.; Hattour, A.; Guennegan, Y..
Deux campagnes de prospection sur les petits pélagiques s'inscrivant dans le cadre du Programme National Mobilisateur (PNM), "Evaluation de ressources pélagiques et démersales des eaux tunisiennes" (1996-1999) ont été menée en étroite collaboration avec l’Institut Français de Recherche et d’Exploitation de la Mer (IFREMER). Ces campagnes ont pour objectifs de préciser l'abondance relative des petits pélagiques et leur variabilité spatiaux-temporelles mais également de quantifier les potentiels exploitables des stocks des animaux aquatiques préalablement définis, et surtout de familiariser l’équipe des scientifiques tunisiens, aux méthodes numériques et informatiques utilisées en participant à la lecture des échogrammes et aux traitements des données des...
Tipo: Journal Contribution Palavras-chave: Abundance; Biomass; Pelagic fisheries; Potential yield; Stock assessment; Biomass; Stock assessment; Pelagic fisheries; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_24251; Http://aims.fao.org/aos/agrovoc/c_5659.
Ano: 2004 URL: http://hdl.handle.net/1834/1163
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Abondonce relative et estimation de la biomasse des petits pelagiques des eaux tunisiennes OceanDocs
Hattour, A.; Ben Abdallah, L.; Guennegan, Y..
Within the frame of the National Program (PNM), 'Assessment of Marine Tunisian Resources' (1996-1999), two prospecting surveys on small pelagic fishes, have been led in narrow collaboration with French Institute IFREMER. Their objectives were to specify the relative fishes abundance, their spatial-temporal variability but also to quantify the maximum sustainable yield (MSY) of this resource. A third important goal was to familiarize a Tunisian scientist team, with numerical methods and data processing used during the cruises (reading of echograms, treatments of data, etc.) in stocks assessment. It is known that the indirect stocks assessment methods of small pelagic species is not reliable, reason for which we opted to apply echo - integration techniques....
Tipo: Journal Contribution Palavras-chave: Abundance; Biomass; Fishery surveys; Pelagic fisheries; Potential yield; Stock assessment; Biomass; Stock assessment; Pelagic fisheries; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_24251; Http://aims.fao.org/aos/agrovoc/c_5659.
Ano: 2004 URL: http://hdl.handle.net/1834/4237
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Abundance, biomass and diversity of the soil fauna in degrated areas under recuperation in the central Amazon region. Repositório Alice
GARCIA, M.; BECK, L.; FORSTER, B.; FRANKLIN, E.; HANAGARTH, W.; HOFER, H.; LUIZAO, F.; LUIZAO, R.; MARTIUS, C.; MORAIS, J. W.; ROMBKE, J..
The soil fauna plays an important role in the stability of decomposition processes and as a result its abundance, biomass and species composition, may influence the nutrient cycles in agroecosystems.
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Fauna; Biomassa; Solo; Area degradada; Recuperacao; Biomass; Soil; Degrated areas; Recuperation.
Ano: 2000 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1017863
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Acoustic surveys on the southern blue whiting (Micromesistius australis). OceanDocs
Madirolas, A..
Two joint Argentine-British acoustic surveys specifically targeted on the southern blue whiting (Micromesistius australis) were carried out during September 1994 and 1995. The surveys confirmed the existence of a spawning concentration area located south from San Carlos Strait, in waters south of Malvinas Islands, ASW. The obtained point estimates of blue whiting abundance were 84801 t for the 1994 survey and 140953 t for the 1995 survey. The surveys also provided information on the school structure and behavior as well as some clues about the complex migration pattern of the species.
Tipo: Journal Contribution Palavras-chave: Fishery surveys; Echo surveys; Biomass; Geographical distribution; Target strength; Biomass; Geographical distribution.
Ano: 1999 URL: http://hdl.handle.net/1834/2567
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Acoustic surveys on the southern blue whiting (Micromesistius australis). OceanDocs
Madirolas, A..
Two joint Argentine-British acoustic surveys specifically targeted on the southern blue whiting (Micromesistius australis) were carried out during September 1994 and 1995. The surveys confirmed the existence of a spawning concentration area located south from San Carlos Strait, in waters south of Malvinas Islands, ASW. The obtained point estimates of blue whiting abundance were 84801 t for the 1994 survey and 140953 t for the 1995 survey. The surveys also provided information on the school structure and behavior as well as some clues about the complex migration pattern of the species.
Tipo: Journal Contribution Palavras-chave: Fishery surveys; Echo surveys; Biomass; Geographical distribution; Target strength; Biomass; Geographical distribution; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_5083.
Ano: 1999 URL: http://hdl.handle.net/1834/2567
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Acoustical estimation of the Antarctic krill swarms spatial distribution and biomass IBSS Repository
Tokarev, Yu. N.; Vasilenko, V. I.; Zhuk, V. F.; Sokolov, V. G.; Slipetsky, D. Ya..
The method of acoustic express-evaluation of the krill (Euphausia superba Dana) population spatial structure and determination of its accumulations biomass, with 80 kHz echosounding frequencies has been worked out during the 7-th Ukrainian Antarctic expedition. The method error does not exceed 10 %, which permits to recommend it for usage under the Antarctic krill fishery conditions. The principal possibility to acoustically express-evaluate chorological structure of the Antarctic krill population has been shown. Formation by krill of dense accumulations of different form, elongated for 6 miles, appeared to be an expressed feature of krill behaviour during observations. The school type in krill distribution was observed as well. Parallel to this the...
Tipo: Journal Contribution Palavras-chave: Acoustic; Antarctic krill; Abundance; Biomass; Акустика; Антарктический криль; Распределение; Биомасса Acoustic data Abundance Biomass Krill fisheries Biomass http://aims.fao.org/aos/agrovoc/c_926.
Ano: 2005 URL: http://repository.ibss.org.ua/dspace/handle/99011/188
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Adubação mineral e seus efeitos na produção de biomassa em árvores de Pinus taeda L. Repositório Alice
SILVA, H. D. da.; BELLOTE, A. F. J.; DEDECEK, R. A.; GOMES, F. dos S..
2003
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Pinus taeda; Biomassa; Adubação; Compartimentos; Biomass; Fertilization.
Ano: 2003 URL: http://www.alice.cnptia.embrapa.br/handle/doc/306899
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Agricultural Impacts of Biofuels Production AgEcon
Walsh, Marie E.; Torre Ugarte, Daniel de la; English, Burton C.; Jensen, Kimberly L.; Hellwinckel, Chad M.; Menard, R. Jamey; Nelson, Richard G..
Analysis of the potential to supply 25% of projected 2025 U.S. transportation fuels indicates sufficient biomass resources are available to meet increased demand while simultaneously meeting food, feed, and export needs. Corn and soybeans continue to be important feedstocks for ethanol and biodiesel production, but cellulose feedstocks (agricultural crop residues, energy crops such as switchgrass, and forestry residues) will play a major role. Farm income increases, mostly because of higher crop prices. Increased crop prices increase the cost of producing biofuels.
Tipo: Journal Article Palavras-chave: Biodiesel; Biofuels; Biomass; Cellulose feedstocks; Crop residues; Ethanol; Forest residues; Switchgrass; Agribusiness; Resource /Energy Economics and Policy; O11; Q11; Q41.
Ano: 2007 URL: http://purl.umn.edu/6514
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Algunos resultados de las campañas primaverales de evaluación anual de anchoíta bonaerense efectuadas entre 1993 y 1996. OceanDocs
Hansen, J.E.; Madirolas, A..
Information resulting from four spring acoustic surveys carried out between 1993 - 1996 to assess bonaerensis anchovy (Engraulis anchoita) biomass (34°- 41°30´S) is presented. Annual estimates, successively higher, went from 1.5 to 5.3 millon tons and the respective coefficient of variability that followed the same trend ranged between 7.4. and 28.0. . In general terms, the largest abundances were those recorded within the coastal strata off the Río de la Plata followed by those of the most southern stratum. Nevertheless, during the 1996 survey, the latter showed very high biomass values and, consequently, the largest mean. The region corresponding to the main commercial anchovy fishing ground during the season represented, in any case, relatively low...
Tipo: Journal Contribution Palavras-chave: Echo surveys; Biomass; Sexual maturity; Growth; Mortality; Biomass; Growth; Sexual maturity; Mortality; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_3394; Http://aims.fao.org/aos/agrovoc/c_7016; Http://aims.fao.org/aos/agrovoc/c_4945.
Ano: 1999 URL: http://hdl.handle.net/1834/2531
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Almacenamiento de carbono en bosques manejados de Pinus patula en el Ejido La Mojonera, Zacualtipán, Hidalgo Colegio de Postgraduados
Figueroa Navarro, Consuelo Marisel.
La cantidad de biomasa se puede emplear para comparar la estructura y atributos funcionales de los ecosistemas forestales en condiciones climáticas similares. Con el objetivo de estimar la cantidad de biomasa y carbono (C) contenidos en rodales manejados de Pinus patula, se realizó este estudio en La Mojonera, Hidalgo. Este Ejido cuenta con programa de manejo en donde se aplica el método de regeneración de Árboles padres. El área está dividida en rodales señalados con la anualidad en la que se aplicó la corta. Para estimar la biomasa se ajustaron ecuaciones simultáneas para los componentes estructurales (fuste, ramas, follaje, corteza) a partir de la cosecha y pesaje de 18 individuos. Las ecuaciones obtenidas fueron: biomasa total, Bt = 5338.610 + 18.634...
Palavras-chave: Análisis de regresión; Biomasa; Bosque manejado; Captura de carbono; Ecuaciones alométricas; Pinus patula; Allometric equations; Biomass; Carbon capture; Managed forest; Maestría; Forestal.
Ano: 2010 URL: http://hdl.handle.net/10521/95
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Almacenamiento de carbono en bosques manejados de Pinus patula en el Ejido La Mojonera, Zacualtipán, Hidalgo Colegio de Postgraduados
Figueroa Navarro, Consuelo Marisel.
La cantidad de biomasa se puede emplear para comparar la estructura y atributos funcionales de los ecosistemas forestales en condiciones climáticas similares. Con el objetivo de estimar la cantidad de biomasa y carbono (C) contenidos en rodales manejados de Pinus patula, se realizó este estudio en La Mojonera, Hidalgo. Este Ejido cuenta con programa de manejo en donde se aplica el método de regeneración de Árboles padres. El área está dividida en rodales señalados con la anualidad en la que se aplicó la corta. Para estimar la biomasa se ajustaron ecuaciones simultáneas para los componentes estructurales (fuste, ramas, follaje, corteza) a partir de la cosecha y pesaje de 18 individuos. Las ecuaciones obtenidas fueron: biomasa total, Bt = 5338.610 + 18.634...
Palavras-chave: Análisis de regresión; Biomasa; Bosque manejado; Captura de carbono; Ecuaciones alométricas; Pinus patula; Allometric equations; Biomass; Carbon capture; Managed forest; Maestría; Forestal.
Ano: 2010 URL: http://hdl.handle.net/10521/95
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ALTERNATIVAS PARA A GERAÇÃO DE ENERGIA RENOVÁVEL NO BRASIL: A OPÇÃO PELA BIOMASSA AgEcon
Marconato, Mariane Silva; Santini, Giuliana Aparecida.
Durante muito tempo, os recursos fósseis e hídricos foram os grandes propulsores da civilização e da economia. O Brasil também se apoiou nessas fontes energéticas para o desenvolvimento de atividades industriais, agrícolas, de serviços e da própria sociedade. Entretanto, vive-se hoje uma crise no abastecimento energético, em função da problemática geopolítica, econômica e ambiental em torno da extração e comercialização desses recursos, uma vez que possuem ainda, caráter não renovável, portanto, finito na natureza. Os escassos investimentos governamentais e a abertura econômica do setor energético resultou no fim do monopólio energético, o que favoreceu a implantação de sistemas alternativos, na maioria, advindos da biomassa. Dentre esses, destaca-se a...
Tipo: Conference Paper or Presentation Palavras-chave: Energia; Fóssil; Hídrico; Renovável; Biomassa; Energy; Fossil; Water; Renewable; Biomass; Resource /Energy Economics and Policy.
Ano: 2008 URL: http://purl.umn.edu/112629
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Alternative biomass furnace wall material from biomass furnace ash CIGR Journal
Flores, Edgar Dulay.
Biomass furnace ash (BFA) generated from drying of grains in mechanical dryers were blended with cement in varying ratio of 1:4, 1:5, 1:6, 1:7 and 1:8 by volume.  Each composition was cured in an ambient condition for 7, 14 and    28 days and determined their properties such as density, porosity, compressive strength and thermal shock resistance.  Cold crushing strength increased with increasing cement content and curing time.  Likewise, density increased with increasing cement content and curing time while porosity showed the other way.  All the sample compositions exceeded 30 cycles without any crack when subjected to thermal shock resistant cycles of heating and cooling using a firing temperature of 1000oC in an electric muffle furnace.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biomass; Rice husk; Ash; Furnace; Mechanical dryer.
Ano: 2017 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3944
Registros recuperados: 548
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