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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. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Amazônia Oriental. |
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Data corrente: |
31/08/2017 |
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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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Autoria: |
BARBOSA, R. I.; MOURÃO JUNIOR, M.; CASADIO, G. M. L.; SILVA, S. J. R. da. |
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Afiliação: |
Reinaldo Imbrozio Barbosa, INPA; MOISES CORDEIRO MOURAO DE O JUNIOR, CPATU; Giliola Maria Lima Casadio, Roraima State Foundation for Environment and Water Resources; Silvio José Reis da Silva, State University of Roraima. |
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Título: |
Reproductive phenology of the main tree species in the Roraima Savanna, brazilian Amazon. |
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Ano de publicação: |
2012 |
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Fonte/Imprenta: |
Ecotropica, v. 18, n. 2, p. 81-92, 2012. |
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Idioma: |
Inglês |
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Conteúdo: |
The reproductive phenological patterns were investigated in the three most abundant tree species in the Roraima open savanna: Curatella americana L.f. (Dilleniaceae), Byrsonima crassifolia (L.) Kunth, and B. coccolobifolia Kunth (Malpighiaceae). A total of 112 trees were marked for study over a period of 24 months (2001-2003), and the existence of climatic synchrony and duration of phenological phases that characterize the reproductive patterns of each population were investigated. The results indicate (i) in C. americana and B. crassifolia reproductive phenological events were strongly associated with low amounts of rainfall, but climatic synchrony was not clearly pronounced in B. coccolobifolia, (ii) each species demonstrated its own distinct phenophase duration and population synchrony, and (iii) the phenological pattern for the three species can be defined as intermediate (between the beginning and end of the dry season), with all species using zoochory as the principal means of seed dispersal. We conclude that for all three species, the majority of phenological events occur during the dry season peak, which corresponds to the lowest amount of cloud cover and the highest amount of insolation across most of the savanna in Roraima. The phenological patterns and the reproductive cycles of the three species studied are similar to those observed in other savanna regions of Brazilian Amazonia and Venezuela. |
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Palavras-Chave: |
Fenologia reprodutiva. |
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Thesagro: |
Árvore; Floresta. |
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Categoria do assunto: |
K Ciência Florestal e Produtos de Origem Vegetal |
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Marc: |
LEADER 01996naa a2200193 a 4500
001 2074772
005 2021-12-22
008 2012 bl uuuu u00u1 u #d
100 1 $aBARBOSA, R. I.
245 $aReproductive phenology of the main tree species in the Roraima Savanna, brazilian Amazon.$h[electronic resource]
260 $c2012
520 $aThe reproductive phenological patterns were investigated in the three most abundant tree species in the Roraima open savanna: Curatella americana L.f. (Dilleniaceae), Byrsonima crassifolia (L.) Kunth, and B. coccolobifolia Kunth (Malpighiaceae). A total of 112 trees were marked for study over a period of 24 months (2001-2003), and the existence of climatic synchrony and duration of phenological phases that characterize the reproductive patterns of each population were investigated. The results indicate (i) in C. americana and B. crassifolia reproductive phenological events were strongly associated with low amounts of rainfall, but climatic synchrony was not clearly pronounced in B. coccolobifolia, (ii) each species demonstrated its own distinct phenophase duration and population synchrony, and (iii) the phenological pattern for the three species can be defined as intermediate (between the beginning and end of the dry season), with all species using zoochory as the principal means of seed dispersal. We conclude that for all three species, the majority of phenological events occur during the dry season peak, which corresponds to the lowest amount of cloud cover and the highest amount of insolation across most of the savanna in Roraima. The phenological patterns and the reproductive cycles of the three species studied are similar to those observed in other savanna regions of Brazilian Amazonia and Venezuela.
650 $aÁrvore
650 $aFloresta
653 $aFenologia reprodutiva
700 1 $aMOURÃO JUNIOR, M.
700 1 $aCASADIO, G. M. L.
700 1 $aSILVA, S. J. R. da
773 $tEcotropica$gv. 18, n. 2, p. 81-92, 2012.
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Embrapa Amazônia Oriental (CPATU) |
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| Acesso ao texto completo restrito à biblioteca da Embrapa Florestas. Para informações adicionais entre em contato com cnpf.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Florestas. |
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Data corrente: |
09/10/2017 |
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Data da última atualização: |
17/10/2017 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
B - 5 |
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Autoria: |
AGUIAR JUNIOR, T. R.; BORTOLOZO, F. R.; ROSA FILHO, E. F.; PARRON, L. M.; LUZ, L. D.; BRITO, A. G.; FERREIRA, M. T. |
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Afiliação: |
Terencio R. Aguiar Junior, Bolsista da Embrapa Florestas; F. R. Bortolozo, University of Lisbon, School of Agronomy, Department of Natural Resources, Environment and Landscape, Portugal; E. F. Rosa Filho, University of Lisbon, School of Agronomy, Department of Natural Resources, Environment and Landscape, Portugal; LUCILIA MARIA PARRON VARGAS, CNPF; L. D. Luz, UFBA; A. G. Brito, University of Lisbon, School of Agronomy, Department of Biosystems Sciences and Engineering, Portugal; M. T. Ferreira, UFPR. |
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Título: |
Fate of selected agrochemicals in a tropical karst aquifer: a five-year study. |
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Ano de publicação: |
2017 |
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Fonte/Imprenta: |
Groundwater for Sustainable Development, v. 5, p. 187-192, Sept. 2017. |
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DOI: |
http://dx.doi.org/10.1016/j.gsd.2017.06.008 |
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Idioma: |
Português |
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Conteúdo: |
Water contamination by agricultural pollutants is one of the major environmental problems for terrestrial and aquatic life on earth. Recent studies have demonstrated the contamination of karst aquifers by pesticides and agricultural nutrients. However, the predominant research does not adequately address the main destination of these compounds. Also, research is targeted primarily towards Europe and North America. The objective of this study is to assess the fate of selected pesticides along the saturated layers of a karst aquifer, located in a tropical area. During a five-year period, 48 monthly collections were conducted by extracting samples from 24 shallow wells (8?9 m depth) and 24 deep wells (55?60 m depth). A total of 2880 samples were obtained. For all samples physical-chemical and pesticide analyses were performed. We found the presence of atrazine, lambdacyhalothrin, lactofen, fluazifop-p-butyl, chlorpyrifos, nitrate and nitrogen agricultural nutrients. The wells with 8?9 m depth had the highest concentration of the compounds studied in relation to deeper wells at 55?60 m. A significant difference was found regarding the types of pesticide (p<0.05) when comparing shallow and deep wells. Nutrients were also monitored and a decrease in the total nitrogen concentration between the wells with a lower depth (42.9 mg L-1) and the deepest wells (1.2 mg L-1) is observed along the period 2008?2013. |
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Palavras-Chave: |
Aquífero; Karst aquifer. |
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Thesagro: |
Lençol freático. |
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Thesaurus NAL: |
Aquifers; Groundwater contamination; pesticides. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
LEADER 02260naa a2200277 a 4500
001 2076997
005 2017-10-17
008 2017 bl uuuu u00u1 u #d
024 7 $ahttp://dx.doi.org/10.1016/j.gsd.2017.06.008$2DOI
100 1 $aAGUIAR JUNIOR, T. R.
245 $aFate of selected agrochemicals in a tropical karst aquifer$ba five-year study.$h[electronic resource]
260 $c2017
520 $aWater contamination by agricultural pollutants is one of the major environmental problems for terrestrial and aquatic life on earth. Recent studies have demonstrated the contamination of karst aquifers by pesticides and agricultural nutrients. However, the predominant research does not adequately address the main destination of these compounds. Also, research is targeted primarily towards Europe and North America. The objective of this study is to assess the fate of selected pesticides along the saturated layers of a karst aquifer, located in a tropical area. During a five-year period, 48 monthly collections were conducted by extracting samples from 24 shallow wells (8?9 m depth) and 24 deep wells (55?60 m depth). A total of 2880 samples were obtained. For all samples physical-chemical and pesticide analyses were performed. We found the presence of atrazine, lambdacyhalothrin, lactofen, fluazifop-p-butyl, chlorpyrifos, nitrate and nitrogen agricultural nutrients. The wells with 8?9 m depth had the highest concentration of the compounds studied in relation to deeper wells at 55?60 m. A significant difference was found regarding the types of pesticide (p<0.05) when comparing shallow and deep wells. Nutrients were also monitored and a decrease in the total nitrogen concentration between the wells with a lower depth (42.9 mg L-1) and the deepest wells (1.2 mg L-1) is observed along the period 2008?2013.
650 $aAquifers
650 $aGroundwater contamination
650 $apesticides
650 $aLençol freático
653 $aAquífero
653 $aKarst aquifer
700 1 $aBORTOLOZO, F. R.
700 1 $aROSA FILHO, E. F.
700 1 $aPARRON, L. M.
700 1 $aLUZ, L. D.
700 1 $aBRITO, A. G.
700 1 $aFERREIRA, M. T.
773 $tGroundwater for Sustainable Development$gv. 5, p. 187-192, Sept. 2017.
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