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 | Acesso ao texto completo restrito à biblioteca da Embrapa Soja. Para informações adicionais entre em contato com valeria.cardoso@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Soja. |
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Data corrente: |
02/03/2012 |
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Data da última atualização: |
24/04/2025 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
NAKATANI, A. S.; MARTINES, A. M.; NOGUEIRA, M. A.; FAGOTTI, D. S. L.; OLIVEIRA, A. G.; BINI, D.; SOUSA, J. P.; CARDOSO, E. J. B. N. |
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Afiliação: |
UNIVERSIDADE DE SÃO PAULO; UNIVERSIDADE DE SÃO PAULO; MARCO ANTONIO NOGUEIRA, CNPSO; UNIVERSIDADE ESTADUAL DE LONDRINA; UNIVERSIDADE ESTADUAL DE LONDRINA; UNIVERSIDADE DE SÃO PAULO; UNIVERSIDADE DE COIMBRA; UNIVERSIDADE DE SÃO PAULO. |
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Título: |
Changes in the genetic structure of Bacteria and microbial activity in an agricultural soil amended with tannery sludge. |
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Ano de publicação: |
2011 |
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Fonte/Imprenta: |
Soil Biology & Biochemistry, v. 43, n. 1, p. 106-114, Jan. 2011. |
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DOI: |
10.1016/j.soilbio.2010.09.019 |
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Idioma: |
Inglês |
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Conteúdo: |
The application of tannery sludge to soils is a form of recycling; however, few studies have examined the impacts of this practice on soil microbial properties. We studied effects of two applications (2006 and 2007) of tannery sludge (with a low chromium content) on the structure of the bacterial community and on the microbial activity of soils. We fertilized an agricultural area in Rolândia, Paraná state, Brazil with different doses of sludge based on total N content, which ranged from 0 to 1200 kg N ha1. Sludge remained on the soil surface for three months before being plowed. Soils were sampled seven times during the experiment. Bacterial community structure, assessed by denaturing gradient gel electrophoresis (DGGE), was modified by the application of tannery sludge. Soon after the first application, there was clear separation between the bacterial communities in different treatments, such that each dose of sludge was associated with a specific community. These differences remained until 300 days after application and also after the second sludge application, but 666 days after the beginning of the experiment no differences were found in the bacterial communities of the lowest doses and the control. The principal response curve (PRC) analysis showed that the first sludge application strongly stimulated biological activity even 300 days after application. The second application also stimulated activity, but at a lower magnitude and for a shorter time, given that 260 days after the second application there was no difference in biological activity among treatments. PRC also showed that the properties most influenced by the application of tannery sludge were enzymatic activities related to N cycling (asparaginase and urease). The redundancy analysis (RDA) showed that tannery sludge?s influence on microbial activity is mainly related to increases in inorganic N and soil pH. Results showed that changes in the structure of the bacterial community in the studied soils were directly related to changes of their biological activity. MenosThe application of tannery sludge to soils is a form of recycling; however, few studies have examined the impacts of this practice on soil microbial properties. We studied effects of two applications (2006 and 2007) of tannery sludge (with a low chromium content) on the structure of the bacterial community and on the microbial activity of soils. We fertilized an agricultural area in Rolândia, Paraná state, Brazil with different doses of sludge based on total N content, which ranged from 0 to 1200 kg N ha1. Sludge remained on the soil surface for three months before being plowed. Soils were sampled seven times during the experiment. Bacterial community structure, assessed by denaturing gradient gel electrophoresis (DGGE), was modified by the application of tannery sludge. Soon after the first application, there was clear separation between the bacterial communities in different treatments, such that each dose of sludge was associated with a specific community. These differences remained until 300 days after application and also after the second sludge application, but 666 days after the beginning of the experiment no differences were found in the bacterial communities of the lowest doses and the control. The principal response curve (PRC) analysis showed that the first sludge application strongly stimulated biological activity even 300 days after application. The second application also stimulated activity, but at a lower magnitude and for a shorter time, given that 260 days ... Mostrar Tudo |
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Thesagro: |
Atividade Enzimática; Nitrogênio. |
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Thesaurus Nal: |
Enzyme activity; Nitrogen. |
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Categoria do assunto: |
X Pesquisa, Tecnologia e Engenharia |
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Marc: |
null
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Registro original: |
Embrapa Soja (CNPSO) |
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| Acesso ao texto completo restrito à biblioteca da Embrapa Amazônia Oriental. Para informações adicionais entre em contato com cpatu.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Amazônia Oriental. |
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Data corrente: |
23/02/2018 |
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Data da última atualização: |
22/12/2021 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 1 |
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Autoria: |
GARRETT, R. D.; GARDNER, T. A.; MORELLO, T. F.; MARCHAND, S.; BARLOW, J.; BLAS, D. E. de; FERREIRA, J. N.; LEES, A. C.; PARRY, L. |
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Afiliação: |
Rachael D. Garrett, Boston University; Toby A. Gardner, Stockholm Environment Institute; Thiago Fonseca Morello, Universidade Federal do ABC; Sebastien Marchand, CERDI/Université Clermont Auvergne; Jos Barlow, Lancaster University; Driss Ezzine de Blas, CIRAD; JOICE NUNES FERREIRA, CPATU; Alexander C. Lees, Manchester Metropolitan University / Cornell University; Luke Parry, Lancaster University / UFPA. |
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Título: |
Explaining the persistence of low income and environmentally degrading land uses in the Brazilian Amazon. |
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Ano de publicação: |
2017 |
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Fonte/Imprenta: |
Ecology and Society, v. 22, n. 3, Art. 27, 2017. |
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DOI: |
https://doi.org/10.5751/ES-09364-220327 |
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Idioma: |
Inglês |
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Conteúdo: |
Tropical forests continue to be plagued by the dual sustainability challenges of deforestation and rural poverty. We seek to understand why many of the farmers living in the Brazilian Amazon, home to the world?s largest tropical agricultural-forest frontier, persist in agricultural activities associated with low incomes and high environmental damage. To answer this question, we assess the factors that shape the development and distribution of agricultural activities and farmer well-being in these frontiers. Our study utilizes a uniquely comprehensive social-ecological dataset from two regions in the eastern Brazilian Amazon and employs a novel conceptual framework that highlights the interdependencies between household attributes, agricultural activities, and well-being. We find that livestock production, which yields the lowest per hectare incomes, remains the most prevalent land use in remote areas, but many examples of high income fruit, horticulture, and staple crop production exist on small properties, particularly in peri-urban areas. The transition to more profitable land uses is limited by lagging supply chain infrastructure, social preferences, and the fact that income associated with land use activities is not a primary source of perceived life quality. Instead subjective well-being is more heavily influenced by the nonmonetary attributes of a rural lifestyle (safety, tranquility, community relations, etc.). We conclude that transitions away from low-income land uses in agricultural-forest frontiers of the Brazilian Amazon need not abandon a land-focused vision of development, but will require policies and programs that identify and discriminate households based on a broader set of household assets, cultural attributes, and aspirations than are traditionally applied. At a broader scale, access to distant markets for high value crops must be improved via investments in processing, storage, and marketing infrastructure. MenosTropical forests continue to be plagued by the dual sustainability challenges of deforestation and rural poverty. We seek to understand why many of the farmers living in the Brazilian Amazon, home to the world?s largest tropical agricultural-forest frontier, persist in agricultural activities associated with low incomes and high environmental damage. To answer this question, we assess the factors that shape the development and distribution of agricultural activities and farmer well-being in these frontiers. Our study utilizes a uniquely comprehensive social-ecological dataset from two regions in the eastern Brazilian Amazon and employs a novel conceptual framework that highlights the interdependencies between household attributes, agricultural activities, and well-being. We find that livestock production, which yields the lowest per hectare incomes, remains the most prevalent land use in remote areas, but many examples of high income fruit, horticulture, and staple crop production exist on small properties, particularly in peri-urban areas. The transition to more profitable land uses is limited by lagging supply chain infrastructure, social preferences, and the fact that income associated with land use activities is not a primary source of perceived life quality. Instead subjective well-being is more heavily influenced by the nonmonetary attributes of a rural lifestyle (safety, tranquility, community relations, etc.). We conclude that transitions away from low-income land us... Mostrar Tudo |
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Palavras-Chave: |
Capital social; Meios de subsistência sustentáveis; Transições de uso da terra. |
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Thesagro: |
Desenvolvimento Rural; Gado; Meio Ambiente. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
null
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Registro original: |
Embrapa Amazônia Oriental (CPATU) |
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