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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
01/10/2004 |
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Data da última atualização: |
06/04/2017 |
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Autoria: |
HAMILTON, S. K.; SIPPEL, S. J.; MELACK, J. M. |
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Afiliação: |
Department of Biological Sciences, University of California, Santa Barbara. |
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Título: |
Dissolved oxygen, carbon dioxide, and methane in waters of the Pantanal wetland of Brazil. |
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Ano de publicação: |
1993 |
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Fonte/Imprenta: |
American Geoghysical Union Fall Meeting, Dec.1993, San Francisco. Abstract... San Francisco: [s.n], 1993. não paginado. |
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Idioma: |
Inglês |
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Conteúdo: |
The Pantnal is a 140,000-km2 complex of riverine floodplains and marshes in the upper Paraguay River basin. Most surface waters are shallow and slowly flowing, often with luxuriant growths of emergent and floating vascular plants. The water column is typically well-mixed or stratified only diurnally. We have sampled representative aquatic environments. throughout the region during 16 months for analysis of dissolved O2 (polarographic sensor), dissolved CO2 (calculated from pH, Gran alkalinity, temperature, and major ions), and dissolved CH4 (gas chromatography). Despite contact with the atmosphere, the waters are characteristically strongly oxygen-depleted: the median of 453 samples was 26% of atmospheric equilibrium (saturation), and 118 of those samples were <10% saturation. CO2 was nearly always supersaturated with a median partial pressure of 7560 ppmv (N=194). Ch4 was highly supersaturated (median 692 ppmv, N=447). This consistent pattern of O2 depletion and CO2 and CH4 accumulation reveals that overall, biological metabolism beneath the water surface is strongly heterotrophic; most net photosynthesis occurs above the water surface or during the dry season. Most anaerobic decomposition of organic matter probably culminates in methanogenesis due to the relative scarcity of alternate electron acceptors to support anaerobic respiration: the median concentration of sulface was only 0.55 uM (N=186; ion chromatography), dissolved H2S was <0.5 uM (methylene blue method), and the sum of nitrate plus nitrite was <7 uM. We are continuing to investigate the roles of iron and manganese in supporting anaerobic respiration, which may be significant but are difficult to estimate due to the participation of particulate forms of these elements. MenosThe Pantnal is a 140,000-km2 complex of riverine floodplains and marshes in the upper Paraguay River basin. Most surface waters are shallow and slowly flowing, often with luxuriant growths of emergent and floating vascular plants. The water column is typically well-mixed or stratified only diurnally. We have sampled representative aquatic environments. throughout the region during 16 months for analysis of dissolved O2 (polarographic sensor), dissolved CO2 (calculated from pH, Gran alkalinity, temperature, and major ions), and dissolved CH4 (gas chromatography). Despite contact with the atmosphere, the waters are characteristically strongly oxygen-depleted: the median of 453 samples was 26% of atmospheric equilibrium (saturation), and 118 of those samples were <10% saturation. CO2 was nearly always supersaturated with a median partial pressure of 7560 ppmv (N=194). Ch4 was highly supersaturated (median 692 ppmv, N=447). This consistent pattern of O2 depletion and CO2 and CH4 accumulation reveals that overall, biological metabolism beneath the water surface is strongly heterotrophic; most net photosynthesis occurs above the water surface or during the dry season. Most anaerobic decomposition of organic matter probably culminates in methanogenesis due to the relative scarcity of alternate electron acceptors to support anaerobic respiration: the median concentration of sulface was only 0.55 uM (N=186; ion chromatography), dissolved H2S was <0.5 uM (methylene blue method), and t... Mostrar Tudo |
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Thesagro: |
Água; Dióxido de Carbono; Metano; Oxigênio. |
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Thesaurus Nal: |
carbon dioxide; methane; oxygen; Pantanal; water. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02496naa a2200253 a 4500
001 1811184
005 2017-04-06
008 1993 bl --- 0-- u #d
100 1 $aHAMILTON, S. K.
245 $aDissolved oxygen, carbon dioxide, and methane in waters of the Pantanal wetland of Brazil.
260 $c1993
520 $aThe Pantnal is a 140,000-km2 complex of riverine floodplains and marshes in the upper Paraguay River basin. Most surface waters are shallow and slowly flowing, often with luxuriant growths of emergent and floating vascular plants. The water column is typically well-mixed or stratified only diurnally. We have sampled representative aquatic environments. throughout the region during 16 months for analysis of dissolved O2 (polarographic sensor), dissolved CO2 (calculated from pH, Gran alkalinity, temperature, and major ions), and dissolved CH4 (gas chromatography). Despite contact with the atmosphere, the waters are characteristically strongly oxygen-depleted: the median of 453 samples was 26% of atmospheric equilibrium (saturation), and 118 of those samples were <10% saturation. CO2 was nearly always supersaturated with a median partial pressure of 7560 ppmv (N=194). Ch4 was highly supersaturated (median 692 ppmv, N=447). This consistent pattern of O2 depletion and CO2 and CH4 accumulation reveals that overall, biological metabolism beneath the water surface is strongly heterotrophic; most net photosynthesis occurs above the water surface or during the dry season. Most anaerobic decomposition of organic matter probably culminates in methanogenesis due to the relative scarcity of alternate electron acceptors to support anaerobic respiration: the median concentration of sulface was only 0.55 uM (N=186; ion chromatography), dissolved H2S was <0.5 uM (methylene blue method), and the sum of nitrate plus nitrite was <7 uM. We are continuing to investigate the roles of iron and manganese in supporting anaerobic respiration, which may be significant but are difficult to estimate due to the participation of particulate forms of these elements.
650 $acarbon dioxide
650 $amethane
650 $aoxygen
650 $aPantanal
650 $awater
650 $aÁgua
650 $aDióxido de Carbono
650 $aMetano
650 $aOxigênio
700 1 $aSIPPEL, S. J.
700 1 $aMELACK, J. M.
773 $tAmerican Geoghysical Union Fall Meeting, Dec.1993, San Francisco. Abstract... San Francisco: [s.n], 1993. não paginado.
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Registro original: |
Embrapa Pantanal (CPAP) |
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Registro Completo
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Biblioteca(s): |
Embrapa Arroz e Feijão. |
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Data corrente: |
08/01/2013 |
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Data da última atualização: |
11/01/2013 |
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Autoria: |
MASCARIN, G. M.; BONFIM JUNIOR, M. F.; ARAÚJO FILHO, J. V. de. |
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Afiliação: |
GABRIEL MOURA MASCARIN, CNPAF; MAURO FERREIRA BONFOM JUNIOR, ESALQ; JERÔNIMO VIEIRA DE ARAÚJO FILHO, ESALQ. |
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Título: |
Trichoderma harzianum reduces population of Meloidogyne incognita in cucumber plants under greenhouse conditions. |
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Ano de publicação: |
2012 |
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Fonte/Imprenta: |
Journal of Entomology and Nematology, v. 4, n. 6, p. 54-57, Dec. 2012. |
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Idioma: |
Inglês |
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Conteúdo: |
Trichoderma harzianum strain ESALQ-1306 was assessed for its potential biological control against Meloidogyne incognita race 4 under in vitro and greenhouse conditions. In vitro, we noticed 64% of conidial attachment on eggs and second-stage juvenile immobilized by the fungus. In greenhouse, cucumber plants were treated with different concentrations of conidial suspensions before and after inoculation with M. incognita. After 60 days, the most efficient treatment provided about 50% nematode reduction by using three sequential applications of T. harzianum. However, the fungus did not increase the fresh and dry root weight. We conclude that this fungus rises as a good option of biological control for the integrated management of root-knot nematode in protected cultivation of cucumbers. |
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Thesagro: |
Controle biológico; Cucumis sativus; Fungo; Meloidogyne incognita; Pepino; Trichoderma harzianum. |
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Thesaurus NAL: |
Biological control; Root-knot nematodes. |
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Categoria do assunto: |
O Insetos e Entomologia |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/73403/1/mascarin.pdf
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Marc: |
LEADER 01563naa a2200241 a 4500
001 1944430
005 2013-01-11
008 2012 bl uuuu u00u1 u #d
100 1 $aMASCARIN, G. M.
245 $aTrichoderma harzianum reduces population of Meloidogyne incognita in cucumber plants under greenhouse conditions.$h[electronic resource]
260 $c2012
520 $aTrichoderma harzianum strain ESALQ-1306 was assessed for its potential biological control against Meloidogyne incognita race 4 under in vitro and greenhouse conditions. In vitro, we noticed 64% of conidial attachment on eggs and second-stage juvenile immobilized by the fungus. In greenhouse, cucumber plants were treated with different concentrations of conidial suspensions before and after inoculation with M. incognita. After 60 days, the most efficient treatment provided about 50% nematode reduction by using three sequential applications of T. harzianum. However, the fungus did not increase the fresh and dry root weight. We conclude that this fungus rises as a good option of biological control for the integrated management of root-knot nematode in protected cultivation of cucumbers.
650 $aBiological control
650 $aRoot-knot nematodes
650 $aControle biológico
650 $aCucumis sativus
650 $aFungo
650 $aMeloidogyne incognita
650 $aPepino
650 $aTrichoderma harzianum
700 1 $aBONFIM JUNIOR, M. F.
700 1 $aARAÚJO FILHO, J. V. de
773 $tJournal of Entomology and Nematology$gv. 4, n. 6, p. 54-57, Dec. 2012.
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Registro original: |
Embrapa Arroz e Feijão (CNPAF) |
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