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Registro Completo |
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Biblioteca(s): |
Embrapa Unidades Centrais. |
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Data corrente: |
18/03/2010 |
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Data da última atualização: |
08/07/2010 |
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Tipo da produção científica: |
Artigo em Anais de Congresso / Nota Técnica |
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Autoria: |
MELLO, J. C. C. B. S. de; GOMES, E. G.; BIONDI NETO, L.; MEZA, L. A. |
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Afiliação: |
UFF; ELIANE GONCALVES GOMES, SGE; UERJ; UFF. |
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Título: |
Alguns paradoxos em modelos DEA-BCC: eficiências negativas e inexistência de retorno de escala. |
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Ano de publicação: |
2008 |
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Fonte/Imprenta: |
IN: ENCONTRO NACIONAL DE ENGENHARIA DE PRODUÇÃO. A INTEGRAÇÃO DE CADEIAS PRODUTIVAS COM A ABORDAGEM DA MANUFATURA SUSTENTÁVEL, 28., 2008, Rio de Janeiro. |
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Idioma: |
Português |
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Conteúdo: |
O modelo DEA-BCC é usado em situações onde as unidades avaliadas são de tamanhos bem diferentes e é necessário levar em conta efeitos de escala. No entanto as propriedades deste modelo são, muitas vezes, mal compreendidas. Além das conheciddas distorções devido à existência de DMUs eficientes à partida mostra-se neste artigo a existência de duas outras propriedades problemáticas: a existência de eficiências negativas e os nunca crescentes retornos de escala. As primeiras surgem em situações tipo avaliação cruzada, devido à existência de um termo independente. Já a inexistência de retornos crescentes de escala advém da convexidade da fronteira. |
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Palavras-Chave: |
DEa; Eficiência negativa; Paradoxo; Retorno de escala. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/17652/1/Alguns-paradoxos-em-modelos-dea-bcc.pdf
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Marc: |
LEADER 01380nam a2200193 a 4500
001 1661622
005 2010-07-08
008 2008 bl uuuu u00u1 u #d
100 1 $aMELLO, J. C. C. B. S. de
245 $aAlguns paradoxos em modelos DEA-BCC$beficiências negativas e inexistência de retorno de escala.$h[electronic resource]
260 $aIN: ENCONTRO NACIONAL DE ENGENHARIA DE PRODUÇÃO. A INTEGRAÇÃO DE CADEIAS PRODUTIVAS COM A ABORDAGEM DA MANUFATURA SUSTENTÁVEL, 28., 2008, Rio de Janeiro.$c2008
520 $aO modelo DEA-BCC é usado em situações onde as unidades avaliadas são de tamanhos bem diferentes e é necessário levar em conta efeitos de escala. No entanto as propriedades deste modelo são, muitas vezes, mal compreendidas. Além das conheciddas distorções devido à existência de DMUs eficientes à partida mostra-se neste artigo a existência de duas outras propriedades problemáticas: a existência de eficiências negativas e os nunca crescentes retornos de escala. As primeiras surgem em situações tipo avaliação cruzada, devido à existência de um termo independente. Já a inexistência de retornos crescentes de escala advém da convexidade da fronteira.
653 $aDEa
653 $aEficiência negativa
653 $aParadoxo
653 $aRetorno de escala
700 1 $aGOMES, E. G.
700 1 $aBIONDI NETO, L.
700 1 $aMEZA, L. A.
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Registro original: |
Embrapa Unidades Centrais (AI-SEDE) |
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Registro Completo
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Biblioteca(s): |
Embrapa Cerrados; Embrapa Florestas. |
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Data corrente: |
22/12/2017 |
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Data da última atualização: |
19/04/2018 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 2 |
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Autoria: |
ZAGATTO, M. R. G.; NIVA, C. C.; THOMAZINI, M. J.; BARETTA, D.; SANTOS, A.; NADOLNY, H.; CARDOSO, G. B. X.; BROWN, G. G. |
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Afiliação: |
MAURÍCIO RUMENOS GUIDETTI ZAGATTO, USP; CINTIA CARLA NIVA, CPAC; MARCILIO JOSE THOMAZINI, CNPF; DILMAR BARETTA, UESC; ALESSANDRA SANTOS, UFPR; HERLON NADOLNY, UFPR; GUILHERME BORGES XARÃO CARDOSO, UFPR; GEORGE GARDNER BROWN, CNPF. |
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Título: |
Soil invertebrates in different land use systems: how integrated production systems and seasonality affect soil mesofauna communities. |
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Ano de publicação: |
2017 |
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Fonte/Imprenta: |
Journal of Agricultural Science and Technology B, v. 7, p. 158-169, 2017. |
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DOI: |
10.17265/2161-6264/2017.03.003 |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: The soil mesofauna plays a role in organic matter comminution and decomposition, and can be used as bioindicators, since they are sensitive to soil management, vegetation and climate changes. Hence, this study aimed to evaluate mesofauna density and diversity in different land use systems to identify faunal relationships with soil properties, management and seasonality. The study area included five land use systems in Ponta Grossa municipality, Paraná State: integrated crop-livestock (ICL), integrated crop-livestock-forestry (ICLF), grazed native pasture (NP), Eucalyptus dunnii plantation (EU) and no-tillage (NT) cropping systems. In each system, eight soil samples for mesofauna were collected with Berlese funnels of 8 cm diameter along a transect in three replicate plots of 50 m × 100 m. For physical and chemical analysis, soil was sampled at five points per plot in two seasons: winter 2012 and autumn 2013. Data were statistically analyzed using ANOVA and Duncan?s test (P < 0.05), nonparametric statistics (when necessary) and redundancy analysis (RDA). Diversity was calculated based on the group richness and Simpson index. The main mesofauna groups found were: Acarina, Collembola and Hymenoptera. Diplopoda, Enchytraeidae, Isopoda, Collembola, Hemiptera, Hymenoptera and Coleoptera larvae were more abundant in autumn than winter. Soil moisture was the main factor responsible for higher mesofauna abundance in autumn. Integrated production systems, especially ICLF had similar invertebrate community abundance and composition with EU, while NT favored Oribatid mites, although the use of insecticides, herbicides and fungicides reduced total mesofauna density. Most correlations between mesofauna and physical-chemical attributes in the winter were not observed in the autumn and vice versa, revealing that there are more factors involved in regulating soil mesofauna distribution. MenosAbstract: The soil mesofauna plays a role in organic matter comminution and decomposition, and can be used as bioindicators, since they are sensitive to soil management, vegetation and climate changes. Hence, this study aimed to evaluate mesofauna density and diversity in different land use systems to identify faunal relationships with soil properties, management and seasonality. The study area included five land use systems in Ponta Grossa municipality, Paraná State: integrated crop-livestock (ICL), integrated crop-livestock-forestry (ICLF), grazed native pasture (NP), Eucalyptus dunnii plantation (EU) and no-tillage (NT) cropping systems. In each system, eight soil samples for mesofauna were collected with Berlese funnels of 8 cm diameter along a transect in three replicate plots of 50 m × 100 m. For physical and chemical analysis, soil was sampled at five points per plot in two seasons: winter 2012 and autumn 2013. Data were statistically analyzed using ANOVA and Duncan?s test (P < 0.05), nonparametric statistics (when necessary) and redundancy analysis (RDA). Diversity was calculated based on the group richness and Simpson index. The main mesofauna groups found were: Acarina, Collembola and Hymenoptera. Diplopoda, Enchytraeidae, Isopoda, Collembola, Hemiptera, Hymenoptera and Coleoptera larvae were more abundant in autumn than winter. Soil moisture was the main factor responsible for higher mesofauna abundance in autumn. Integrated production systems, especially ICLF had... Mostrar Tudo |
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Palavras-Chave: |
Bioindicador. |
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Thesagro: |
Animal Invertebrado; Biodiversidade; Manejo do Solo; Umidade do Solo; Variação Sazonal. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/175721/1/2017-G.Brown-JAST-Soil-invertebrates.pdf
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Marc: |
LEADER 02827naa a2200289 a 4500
001 2083495
005 2018-04-19
008 2017 bl uuuu u00u1 u #d
024 7 $a10.17265/2161-6264/2017.03.003$2DOI
100 1 $aZAGATTO, M. R. G.
245 $aSoil invertebrates in different land use systems$bhow integrated production systems and seasonality affect soil mesofauna communities.$h[electronic resource]
260 $c2017
520 $aAbstract: The soil mesofauna plays a role in organic matter comminution and decomposition, and can be used as bioindicators, since they are sensitive to soil management, vegetation and climate changes. Hence, this study aimed to evaluate mesofauna density and diversity in different land use systems to identify faunal relationships with soil properties, management and seasonality. The study area included five land use systems in Ponta Grossa municipality, Paraná State: integrated crop-livestock (ICL), integrated crop-livestock-forestry (ICLF), grazed native pasture (NP), Eucalyptus dunnii plantation (EU) and no-tillage (NT) cropping systems. In each system, eight soil samples for mesofauna were collected with Berlese funnels of 8 cm diameter along a transect in three replicate plots of 50 m × 100 m. For physical and chemical analysis, soil was sampled at five points per plot in two seasons: winter 2012 and autumn 2013. Data were statistically analyzed using ANOVA and Duncan?s test (P < 0.05), nonparametric statistics (when necessary) and redundancy analysis (RDA). Diversity was calculated based on the group richness and Simpson index. The main mesofauna groups found were: Acarina, Collembola and Hymenoptera. Diplopoda, Enchytraeidae, Isopoda, Collembola, Hemiptera, Hymenoptera and Coleoptera larvae were more abundant in autumn than winter. Soil moisture was the main factor responsible for higher mesofauna abundance in autumn. Integrated production systems, especially ICLF had similar invertebrate community abundance and composition with EU, while NT favored Oribatid mites, although the use of insecticides, herbicides and fungicides reduced total mesofauna density. Most correlations between mesofauna and physical-chemical attributes in the winter were not observed in the autumn and vice versa, revealing that there are more factors involved in regulating soil mesofauna distribution.
650 $aAnimal Invertebrado
650 $aBiodiversidade
650 $aManejo do Solo
650 $aUmidade do Solo
650 $aVariação Sazonal
653 $aBioindicador
700 1 $aNIVA, C. C.
700 1 $aTHOMAZINI, M. J.
700 1 $aBARETTA, D.
700 1 $aSANTOS, A.
700 1 $aNADOLNY, H.
700 1 $aCARDOSO, G. B. X.
700 1 $aBROWN, G. G.
773 $tJournal of Agricultural Science and Technology B$gv. 7, p. 158-169, 2017.
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Embrapa Cerrados (CPAC) |
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