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Registro Completo |
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Biblioteca(s): |
Embrapa Florestas. |
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Data corrente: |
14/07/2015 |
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Data da última atualização: |
15/07/2015 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
AGUIAR JUNIOR, T. R.; BORTOLOZO, F. R.; HANSEL, F. A.; RASERA, K.; FERREIRA, M. T. |
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Afiliação: |
Terencio R. Aguiar Junior, UFPR / University of Lisbon; F. R. Bortolozo, UFPR; FABRICIO AUGUSTO HANSEL, CNPF; K. Rasera, UFPR; M. T. Ferreira, UFPR / University of Lisbon. |
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Título: |
Riparian buffer zones as pesticide filters of no-till crops. |
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Ano de publicação: |
2015 |
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Fonte/Imprenta: |
Environmental Science and Pollution Research, v. 22, n. 14, p. 10618-10626, July 2015. |
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DOI: |
10.1007/s11356-015-4281-5 |
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Idioma: |
Inglês |
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Conteúdo: |
Several studies have pointed to the potential benefits of riparian vegetation as buffer zones for agricultural and industrial pollutants harmful to aquatic ecosystems. However, other studies have called into question its use as an ecological filter, questioning the widths and conditions for which they are effective as a filter. In this work, we have investigated the buffering capacity of the riparian one to retain pesticides in the water-saturated zone, on 27 sites composed by riparian buffer zones with different vegetation structure (woody, shrubs, or grass vegetation) and width (12, 36, and 60 m). Five pesticides were analyzed. The effectiveness of the filtering was largely influenced by the width and vegetation type of the buffer zone. In general, decreasing pesticide removal followed in this order wood > shrubs > grass. The 60mwoody buffer zone was the most effective in the removal of all the pesticides. Only atrazine was detected in this case (0.3 ?g L?1). Furthermore, a linear correlation (R2>0.97) was observed in their removal for all compounds and buffer zones studied. Thus, preserving the woody vegetation in the riparian zone is important for watershed management and groundwater quality in the no-tillage system in temperate climate. |
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Palavras-Chave: |
Contaminação da água; Escoamento agrícola; No-till systems; Riparian buffer zones; Sistema de plantio direto; Water contamination; Water-saturated zone; Zona saturada de água. |
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Thesagro: |
Mata Ciliar; Pesticida. |
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Thesaurus Nal: |
agricultural runoff; pesticides. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02254naa a2200325 a 4500
001 2019731
005 2015-07-15
008 2015 bl uuuu u00u1 u #d
024 7 $a10.1007/s11356-015-4281-5$2DOI
100 1 $aAGUIAR JUNIOR, T. R.
245 $aRiparian buffer zones as pesticide filters of no-till crops.$h[electronic resource]
260 $c2015
520 $aSeveral studies have pointed to the potential benefits of riparian vegetation as buffer zones for agricultural and industrial pollutants harmful to aquatic ecosystems. However, other studies have called into question its use as an ecological filter, questioning the widths and conditions for which they are effective as a filter. In this work, we have investigated the buffering capacity of the riparian one to retain pesticides in the water-saturated zone, on 27 sites composed by riparian buffer zones with different vegetation structure (woody, shrubs, or grass vegetation) and width (12, 36, and 60 m). Five pesticides were analyzed. The effectiveness of the filtering was largely influenced by the width and vegetation type of the buffer zone. In general, decreasing pesticide removal followed in this order wood > shrubs > grass. The 60mwoody buffer zone was the most effective in the removal of all the pesticides. Only atrazine was detected in this case (0.3 ?g L?1). Furthermore, a linear correlation (R2>0.97) was observed in their removal for all compounds and buffer zones studied. Thus, preserving the woody vegetation in the riparian zone is important for watershed management and groundwater quality in the no-tillage system in temperate climate.
650 $aagricultural runoff
650 $apesticides
650 $aMata Ciliar
650 $aPesticida
653 $aContaminação da água
653 $aEscoamento agrícola
653 $aNo-till systems
653 $aRiparian buffer zones
653 $aSistema de plantio direto
653 $aWater contamination
653 $aWater-saturated zone
653 $aZona saturada de água
700 1 $aBORTOLOZO, F. R.
700 1 $aHANSEL, F. A.
700 1 $aRASERA, K.
700 1 $aFERREIRA, M. T.
773 $tEnvironmental Science and Pollution Research$gv. 22, n. 14, p. 10618-10626, July 2015.
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Embrapa Florestas (CNPF) |
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Registro Completo
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Biblioteca(s): |
Embrapa Soja. |
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Data corrente: |
22/12/2005 |
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Data da última atualização: |
22/12/2005 |
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Autoria: |
HUNGRIA, M.; MENNA, P.; GERMANO, M. G.; CHUEIRE, L. M. O.; BANGEL, E. V.; CAMPO, R. J. |
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Título: |
Diversity of a Brazilian collection of rhizobial strains. |
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Ano de publicação: |
2005 |
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Fonte/Imprenta: |
In: WANG, Y. P.; LIN, M.; TIAN, Z. X.; ELMERICH, C.; NEWTON. W. E. (Ed). Biological nitrogen fixation, sustainable agriculture and the environment. Dordrecht: Springer, 2005. p. 413. |
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Idioma: |
Inglês |
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Notas: |
Proceedingsof the 14th International Nitrogen Fixation Congress. |
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Conteúdo: |
The Leguminosae is one of the largest plant families with over 18,000 species classified into around 650 genera: most are capable of effective symbioses with rhizobial strains. Howerver, despite reports of high strain diversity, especially in the tropics, there are less than 40 described rhizobial species. Ribosomal sequences, emphasinzing 16S rRNA gene ( 1.5 kb), are the method of choice for tracing bacteria phylogenies. Speciation of genera can be enhanced by analaysis of other ribosomal genes because both the 23S rRNA ( 2.3 kb) and the 16S-23S rRNA intergenic space (ITS) show higher variability than 16S rRNA. Analyses of rhizobial ribosomal genes have used RFLP-PCR, as well as partial or complete sequencing of bases. In Brazil, there are 200 rhizobial strains recommended for 95 legume species, but little is known of their genetic diversity. A Brazilian culture collection of 119 strains of Bradyrhizobium, isolated from thirty-three legume species, representing nine tribes and all three subfamilies, were analyzed by RFLP-PCR of the 16S rRNA, 23S rRNA and ITS region, each with three restriction enzymes. 43 of those atrains are recommended in Brazil as the most effective for 31 host legumes. For the 16S rRNA gene, reference strains of B. japonicum fit into two major clusters at 50% similarity, whereas two other cluster (at 53% similarity) were composed of strains of B. elkanii; all strains were joined at a final level of similarity of 28%. The higher variability in the ITS and 23rRNA resulted in final grouping at very low level of similarities, 27% and 16% respectively. Considering the three ribosomal regions, two great groups were visualized, related to B. japonicum (with most strains from soybean) and B. elkanii (most strains from indigenous legumes), at similarity levels of 54 and 46%, respectively, and at least two new clusters that might represent new species. The complete 16S rRNA sequence for another set of 80 rhizobial strains from 30 different legume species (23 recommended as most effective) were clustered within the genera Rhizobium, Sinorhizobium, Mesorhizobium and Bradyrhizobium. Three strains, recommended for Clitoria fairchildian, Piptadenia gonoacantha and Ormosia nitida, were clustered with Burkholderia sp. strain TJ182. This collection of strains indicates an extremely high level of genetic diversity in the tropics. MenosThe Leguminosae is one of the largest plant families with over 18,000 species classified into around 650 genera: most are capable of effective symbioses with rhizobial strains. Howerver, despite reports of high strain diversity, especially in the tropics, there are less than 40 described rhizobial species. Ribosomal sequences, emphasinzing 16S rRNA gene ( 1.5 kb), are the method of choice for tracing bacteria phylogenies. Speciation of genera can be enhanced by analaysis of other ribosomal genes because both the 23S rRNA ( 2.3 kb) and the 16S-23S rRNA intergenic space (ITS) show higher variability than 16S rRNA. Analyses of rhizobial ribosomal genes have used RFLP-PCR, as well as partial or complete sequencing of bases. In Brazil, there are 200 rhizobial strains recommended for 95 legume species, but little is known of their genetic diversity. A Brazilian culture collection of 119 strains of Bradyrhizobium, isolated from thirty-three legume species, representing nine tribes and all three subfamilies, were analyzed by RFLP-PCR of the 16S rRNA, 23S rRNA and ITS region, each with three restriction enzymes. 43 of those atrains are recommended in Brazil as the most effective for 31 host legumes. For the 16S rRNA gene, reference strains of B. japonicum fit into two major clusters at 50% similarity, whereas two other cluster (at 53% similarity) were composed of strains of B. elkanii; all strains were joined at a final level of similarity of 28%. The higher variability in the ITS ... Mostrar Tudo |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 03068naa a2200193 a 4500
001 1468692
005 2005-12-22
008 2005 bl --- 0-- u #d
100 1 $aHUNGRIA, M.
245 $aDiversity of a Brazilian collection of rhizobial strains.
260 $c2005
500 $aProceedingsof the 14th International Nitrogen Fixation Congress.
520 $aThe Leguminosae is one of the largest plant families with over 18,000 species classified into around 650 genera: most are capable of effective symbioses with rhizobial strains. Howerver, despite reports of high strain diversity, especially in the tropics, there are less than 40 described rhizobial species. Ribosomal sequences, emphasinzing 16S rRNA gene ( 1.5 kb), are the method of choice for tracing bacteria phylogenies. Speciation of genera can be enhanced by analaysis of other ribosomal genes because both the 23S rRNA ( 2.3 kb) and the 16S-23S rRNA intergenic space (ITS) show higher variability than 16S rRNA. Analyses of rhizobial ribosomal genes have used RFLP-PCR, as well as partial or complete sequencing of bases. In Brazil, there are 200 rhizobial strains recommended for 95 legume species, but little is known of their genetic diversity. A Brazilian culture collection of 119 strains of Bradyrhizobium, isolated from thirty-three legume species, representing nine tribes and all three subfamilies, were analyzed by RFLP-PCR of the 16S rRNA, 23S rRNA and ITS region, each with three restriction enzymes. 43 of those atrains are recommended in Brazil as the most effective for 31 host legumes. For the 16S rRNA gene, reference strains of B. japonicum fit into two major clusters at 50% similarity, whereas two other cluster (at 53% similarity) were composed of strains of B. elkanii; all strains were joined at a final level of similarity of 28%. The higher variability in the ITS and 23rRNA resulted in final grouping at very low level of similarities, 27% and 16% respectively. Considering the three ribosomal regions, two great groups were visualized, related to B. japonicum (with most strains from soybean) and B. elkanii (most strains from indigenous legumes), at similarity levels of 54 and 46%, respectively, and at least two new clusters that might represent new species. The complete 16S rRNA sequence for another set of 80 rhizobial strains from 30 different legume species (23 recommended as most effective) were clustered within the genera Rhizobium, Sinorhizobium, Mesorhizobium and Bradyrhizobium. Three strains, recommended for Clitoria fairchildian, Piptadenia gonoacantha and Ormosia nitida, were clustered with Burkholderia sp. strain TJ182. This collection of strains indicates an extremely high level of genetic diversity in the tropics.
700 1 $aMENNA, P.
700 1 $aGERMANO, M. G.
700 1 $aCHUEIRE, L. M. O.
700 1 $aBANGEL, E. V.
700 1 $aCAMPO, R. J.
773 $tIn: WANG, Y. P.; LIN, M.; TIAN, Z. X.; ELMERICH, C.; NEWTON. W. E. (Ed). Biological nitrogen fixation, sustainable agriculture and the environment. Dordrecht: Springer, 2005. p. 413.
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