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| Registros recuperados: 38 | |
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| Carmona,Martín R; Aguilera,María; Pérez,Cecilia A.; Serey,Italo. |
| El mantillo del suelo (horizontes Oi y Oe) de ecosistemas boscosos es utilizado como hábitat, fuente de nutrientes y energía para una gran diversidad de organismos. Ocurre, en consecuencia, un flujo de carbono (C) desde el detritus debido a la producción de CO2 por respiración de la biota. En este trabajo se midió y comparó la actividad respiratoria en condiciones de laboratorio de muestras de mantillo, colectadas en tres tipos de bosques del centro y sur de Chile: bosque Nordpatagónico (Nothofagus), bosque Siempreverde de Coníferas (Fitzroya) y bosque Esclerófilo (Cryptocarya). Las muestras de este último se separaron en tres fracciones de tamaño de partículas (>2,4; 2,4-1,2 y < 1,2 mm), con el fin de poner a prueba la hipótesis de la constancia de... |
| Tipo: Journal article |
Palavras-chave: Decomposition; Leaf litter; C-CO2 evolution; Temperate forests. |
| Ano: 2006 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432006000100001 |
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| Fairlie, Robert W.. |
| The Blinder-Oaxaca decomposition technique is widely used to identify and quantify the separate contributions of group differences in measurable characteristics, such as education, experience, marital status, and geographical differences to racial and gender gaps in outcomes. The technique cannot be used directly, however, if the outcome is binary and the coefficients are from a logit or probit model. I describe a relatively simple method of performing a decomposition that uses estimates from a logit or probit model. Expanding on the original application of the technique in Fairlie (1999), I provide a more thorough discussion of how to apply the technique, an analysis of the sensitivity of the decomposition estimates to different parameters, and the... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Logit; Probit; Decomposition; Race; Gender; Discrimination; Research Methods/ Statistical Methods; C8; J7. |
| Ano: 2003 |
URL: http://purl.umn.edu/28425 |
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| Turchetto, Felipe; Fortes, Fabiano de Oliveira. |
| O presente estudo teve por objetivo analisar e descrever a dinâmica sazonal da deposição e decomposição de serapilheira na Floresta Estacional Decidual da região do Médio Alto Uruguai, RS. Para a determinação da deposição de serapilheira foram instalados 20 coletores de 1 m2 em uma área de um hectare, sendo realizadas avaliações mensais. Para a amostra da serapilheira acumulada nas estações sazonais, foram coletadas 20 amostras aleatórias em molduras de 25 cm x 25 cm. O material coletado foi identificado e separado nas frações: folhas, galhos e miscelânea. Após a estratificação, as amostras foram secas em estufa a 70 oC e pesadas. A deposição anual de serapilheira foi estimada em 7,14 t.ha-1, sendo composta por 58,54% de folhas, 28,69% de galhos e 12,77%... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Recursos Florestais; Engenharia Florestal; Ecologia Mineralização; Sazonalidade; Decomposição Mineralization; Seasonality; Decomposition. |
| Ano: 2014 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/735 |
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| Brum,Paulo R.; Farjalla,Vinicius F.; Gonçalves Jr.,José F.; Santos,Anderson M. dos; Pôrto,Maurício T.; Vieira,Elisa D. R.; Ferreira,Flávia M.; Bianchini Jr.,Irineu. |
| In this work, we describe qualitative and quantitative aspects of the cycling of detritus of aquatic macrophytes and carbohydrates in two coastal lagoons of the northeastern part of the State of Rio de Janeiro. Samples of water of the Imboassica and Cabiúnas lagoons were enriched with sucrose. Samples of water of the Cabiúnas lagoon were also utilized to arrange mineralization chambers with fragments of three species of aquatic macrophytes found in these lagoons (Typha domingensis, Potamogeton stenostachys and Nymphaea ampla). Following that, the bottles were aerated and incubated (in the laboratory) for a period of 8 days. The concentrations of dissolved oxygen, the pH, the electrical conductivity and the temperature were daily measured. The anaerobic... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Decomposition; Aerobic mineralization; Dissolved oxygen; Coastal lagoons; Aquatic macrophytes. |
| Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89131999000400008 |
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| Abreu, Paulo Giovanni de; Embrapa Suínos e Aves; Paiva, Doralice Pedroso de; Embrapa Suínos e Aves; Abreu, Valeria Maria Nascimento; Embrapa Suínos e Aves; Coldebella, Arlei; Embrapa Suínos e Aves; Cestonaro, Taiana; Universidade do Contestado -UnC. |
| Avaliou-se a atuação da casca de arroz e da palhada de soja como substrato para compostagem de carcaça de frangos de corte, observando a degradação dos dois substratos e das carcaças pelo monitoramento da temperatura, peso das carcaças e dos substratos e análise físico-química do produto final. As câmaras foram montadas com carcaças de 10 aves recém abatidas, com quatro repetições no tempo. Instalou-se em cada câmara um termopar para registro da temperatura. O substrato e as carcaças foram pesadas separadamente, no início, aos 15 e aos 30 dias de compostagem. Ao final de cada período, foram realizadas análises físico-química de amostras de cada câmara, avaliando-se o pH e os teores de matéria seca, cinzas, P, N, K, Cu, Zn, Mn, Fe e carbono orgânico.... |
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Palavras-chave: Composição físico-química; Decomposição; Pilhas de compostagem physiochemical composition; Decomposition; Composting piles. |
| Ano: 2011 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/10824 |
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| Sausen,Tanise Luisa; Schaefer,Guilherme Frederico de Paula; Tomazi,Michely; Santos,Lívia Scheunemann dos; Bayer,Cimélio; Rosa,Luís Mauro Gonçalves. |
| Soil carbon accumulation is largely dependent on net primary productivity. To our knowledge, there have been no studies investigating the dynamics of carbon accumulation in weathered subtropical soils, especially in managed eucalyptus plantations. We quantified the seasonal input of leaf litter, the leaf decomposition rate and soil carbon stocks in an commercial plantation of Eucalyptus saligna Labill. in southern Brazil. Our goal was to evaluate, through multiple linear regression, the influence that certain chemical characteristics of litter, as well as chemical and physical characteristics of soil, have on carbon accumulation in soil organic matter fractions. Variables related to the chemical composition of litter were not associated with the soil... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Weathered soils; Decomposition; Soil organic matter fractions; Litter input. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062014000200013 |
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| Teixeira, Cícero Monti; EPAMIG; Carvalho, Gabriel José de; UFLA; Andrade, Messias José Bastos de; UFLA; Silva, Carlos Alberto; UFLA; Pereira, Janser Moura; UFU. |
| O objetivo foi avaliar a produção de fitomassa, o acúmulo e liberação de macronutrientes, e a decomposição das palhadas de milheto (Pennisetum typhoides (Burm.) Stapf) solteiro e consorciado com crotalária (Crotalaria juncea), sob a cultura do feijoeiro. O delineamento foi o de blocos casualizados, com quatro repetições, em esquema de parcelas subdivididas. As parcelas foram constituídas pelas duas palhadas; as subparcelas, pelas épocas de avaliação, ao longo do cultivo do feijoeiro (0, 8, 16, 24, 40, 56 e 72 dias após a semeadura). Os resíduos coletados foram secos em estufa de circulação forçada de ar, a 65ºC, até atingirem massa constante, para a determinação da matéria seca remanescente. Posteriormente, foram moídos e encaminhados para laboratório,... |
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Palavras-chave: 5.01.03.04-0 Produção de Mudas ciclagem de nutrientes; Litter-bags; Decomposição; Modelos não-lineares; Consórcio gramínea x leguminosa. 5.01.01.03-0 nutrient cycling; Litter bags; Decomposition; Non-linear models; Grass x leguminous intercropping.. |
| Ano: 2009 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/1356 |
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| Marques,Márcia S.; Sá,Nadja M.; Scotti,María R.. |
| Leguminous trees are being planted in order to establish restoration units in the Brazilian Atlantic forest ecosystem. The success of the establishment depends on the growth, productivity of plants and litter decomposition rates. The objective of this study was to investigate the decomposition of araribá (Centrolobium tomentosum Guill. Ex Benth) leaves, at two sites. Site 1 was an experimental plantation of the native species C. tomentosum, which was inoculated with rhizobia plus mycorrhizal fungi, and Site 2 was a eucalyptus (Eucalyptus grandis W. Hill ex Maiden) forest. The leaf litter of C. tomentosum was incubated for 120, 240 and 360 days in both sites. The decomposition rate and dynamic of mineralization of the organic matter and the nutrients K, Mg,... |
| Tipo: Journal article |
Palavras-chave: Decomposition; Eucalyptus sp.; Microbial colonization; Tropical forest; Soil fertility. |
| Ano: 2003 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072003000100008 |
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| Xin, Xiangfei; Qin, Fu. |
| This paper studies the regional disparity of China's agricultural productivity growth by decomposing it into technical changes, efficiency changes and input accumulation per worker. The convergence test is also used to analyze the determinants of regional disparity. The paper finds that during 1987 and 2005, although the growth of China’s agricultural labor productivity mainly depended on the accumulation of inputs, technical changes contributed more to regional disparities in agricultural productivity growth. Improving efficiency to promote TFP growth is important for agricultural labor productivity growth for the three regions—Eastern, Central and Western of China. The increase in inputs for Western China, and the improvement in technical change for... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Agricultural labor productivity growth; Decomposition; Regional disparity; Productivity Analysis. |
| Ano: 2009 |
URL: http://purl.umn.edu/51047 |
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| Cunha,Gláucio de Mello; Gama-Rodrigues,Antonio Carlos. |
| In this study, we evaluate litter biomass and nutrient inputs, as well as nutrient use efficiency (NUE), in two fragments of dense montane rain forest within the Atlantic Forest Biome in the northern region of the state of Rio de Janeiro, Brazil. The total annual average litter production for the two fragments (designated M1 and M2) was 7.72 and 7.56 t ha−¹ year−¹, respectively. The annual nutrient return rate was 146.67, 4.84, 21.41, 64.93, and 17.25 kg ha−¹ year−¹ for N, P, K, Ca, and Mg, respectively. No differences in NUE were observed between the studied fragments, except for that of P. The average NUE for N, P, K, Ca, and Mg, respectively, was 51, 1426, 367, 111, and 428 in fragment M1, compared with 51, 1890, 360, 126, and 472 in fragment M2. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Decomposition; Forest fragment; Litter; Nutrient input; Nutrient use efficiency. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062014000400015 |
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| BUSTAMANTE-SÁNCHEZ,MARCELA A.; GREZ,AUDREY A.; SIMONETTI,JAVIER A.. |
| Habitat fragmentation may result in changes in species number and population abundance among habitats that differ in area, structure, or edge characteristics. These changes, in turn, may result in alterations in ecosystem process such as decomposition of organic matter. Through an experimental approach, we compared the beetles assemblages associated with dung and decomposition of cow feces in a continuous portion of Maulino forest, forest fragments and in pine plantations that surround this forest and forest remnants. Abundance and richness of dung-associated beetles were lower in forest fragments compared to the continuous forest and pine plantations. However, dung decomposition was similar in these three habitats. Beetle abundance, species richness and... |
| Tipo: Journal article |
Palavras-chave: Temperate forest; Fragmentation; Insects; Decomposition. |
| Ano: 2004 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2004000100009 |
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| Registros recuperados: 38 | |
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