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Registro Completo |
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Biblioteca(s): |
Embrapa Amazônia Oriental. |
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Data corrente: |
15/12/2009 |
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Data da última atualização: |
08/06/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
KELLER, M.; VARNER, R.; DIAS, J. D.; SILVA, H.; CRILL, P.; OLIVEIRA JUNIOR, R. C. de; ASNER, G. P. |
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Afiliação: |
MICHAEL KELLER, International Institute of Tropical Forestry, USDA Forest Service / University of New Hampshire; RUTH VARNER, University of New Hampshire; JADSON D. DIAS, Fundação Floresta Tropical; HUDSON SILVA, University of New Hampshire / Fundação Floresta Tropical; PATRICK CRILL, University of New Hampshire / Stockholm University; RAIMUNDO COSME DE OLIVEIRA JUNIOR, CPATU; GREGORY P. ASNER, Stanford University. |
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Título: |
Soil-atmosphere exchange of nitrous oxide, nitric oxide, methane, and carbon dioxide in logged and undisturbed forest in the Tapajos National Forest, Brazil. |
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Ano de publicação: |
2005 |
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Fonte/Imprenta: |
Earth Interactions, v. 9, n. 23, p. 1-28, Nov. 2005. |
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Idioma: |
Inglês |
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Conteúdo: |
Selective logging is an extensive land use in the Brazilian Amazon region. The soil?atmosphere fluxes of nitrous oxide (N2O), nitric oxide (NO), methane (CH4), and carbon dioxide (CO2) are studied on two soil types (clay Oxisol and sandy loam Ultisol) over two years (2000?01) in both undisturbed forest and forest recently logged using reduced impact forest management in the Tapajos National Forest, near Santarem, Para, Brazil. In undisturbed forest, annual soil?atmosphere fluxes of N2O (mean ± standard error) were 7.9 ± 0.7 and 7.0 ± 0.6 ng N cm?2 h?1 for the Oxisol and 1.7 ± 0.1 and 1.6 ± 0.3 ng N cm?2 h?1 for the Ultisol for 2000 and 2001, respectively. The annual fluxes of NO from undisturbed forest soil in 2001 were 9.0 ± 2.8 ng N cm?2 h?1 for the Oxisol and 8.8 ± 5.0 ng N cm?2 h?1 for the Ultisol. Consumption of CH4 from the atmosphere dominated over production on undisturbed forest soils. Fluxes averaged ?0.3 ± 0.2 and ?0.1 ± 0.9 mg CH4 m?2 day?1 on the Oxisol and ?1.0 ± 0.2 and ?0.9 ± 0.3 mg CH4 m?2 day?1 on the Ultisol for years 2000 and 2001. For CO2 in 2001, the annual fluxes averaged 3.6 ± 0.4 ?mol m?2 s?1 on the Oxisol and 4.9 ± 1.1 ?mol m?2 s?1 on the Ultisol. We measured fluxes over one year each from two recently logged forests on the Oxisol in 2000 and on the Ultisol in 2001. Sampling in logged areas was stratified from greatest to least ground disturbance covering log decks, skid trails, tree-fall gaps, and forest matrix. Areas of strong soil compaction, especially the skid trails and logging decks, were prone to significantly greater emissions of N2O, NO, and especially CH4. In the case of CH4, estimated annual emissions from decks reached extremely high rates of 531 ± 419 and 98 ± 41 mg CH4 m?2 day?1, for Oxisol and Ultisol sites, respectively, comparable to wetland emissions in the region. We calculated excess fluxes from logged areas by subtraction of a background forest matrix or undisturbed forest flux and adjusted these fluxes for the proportional area of ground disturbance. Our calculations suggest that selective logging increases emissions of N2O and NO from 30% to 350% depending upon conditions. While undisturbed forest was a CH4 sink, logged forest tended to emit methane at moderate rates. Soil?atmosphere CO2 fluxes were only slightly affected by logging. The regional effects of logging cannot be simply extrapolated based upon one site. We studied sites where reduced impact harvest management was used while in typical conventional logging ground damage is twice as great. Even so, our results indicate that for N2O, NO, and CH4, logging disturbance may be as important for regional budgets of these gases as other extensive land-use changes in the Amazon such as the conversion of forest to cattle pasture. MenosSelective logging is an extensive land use in the Brazilian Amazon region. The soil?atmosphere fluxes of nitrous oxide (N2O), nitric oxide (NO), methane (CH4), and carbon dioxide (CO2) are studied on two soil types (clay Oxisol and sandy loam Ultisol) over two years (2000?01) in both undisturbed forest and forest recently logged using reduced impact forest management in the Tapajos National Forest, near Santarem, Para, Brazil. In undisturbed forest, annual soil?atmosphere fluxes of N2O (mean ± standard error) were 7.9 ± 0.7 and 7.0 ± 0.6 ng N cm?2 h?1 for the Oxisol and 1.7 ± 0.1 and 1.6 ± 0.3 ng N cm?2 h?1 for the Ultisol for 2000 and 2001, respectively. The annual fluxes of NO from undisturbed forest soil in 2001 were 9.0 ± 2.8 ng N cm?2 h?1 for the Oxisol and 8.8 ± 5.0 ng N cm?2 h?1 for the Ultisol. Consumption of CH4 from the atmosphere dominated over production on undisturbed forest soils. Fluxes averaged ?0.3 ± 0.2 and ?0.1 ± 0.9 mg CH4 m?2 day?1 on the Oxisol and ?1.0 ± 0.2 and ?0.9 ± 0.3 mg CH4 m?2 day?1 on the Ultisol for years 2000 and 2001. For CO2 in 2001, the annual fluxes averaged 3.6 ± 0.4 ?mol m?2 s?1 on the Oxisol and 4.9 ± 1.1 ?mol m?2 s?1 on the Ultisol. We measured fluxes over one year each from two recently logged forests on the Oxisol in 2000 and on the Ultisol in 2001. Sampling in logged areas was stratified from greatest to least ground disturbance covering log decks, skid trails, tree-fall gaps, and forest matrix. Areas of strong soil compaction, esp... Mostrar Tudo |
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Palavras-Chave: |
Trace gas. |
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Thesagro: |
Floresta Tropical. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/103525/1/ei1252E1.pdf
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Marc: |
LEADER 03484naa a2200217 a 4500
001 1578048
005 2022-06-08
008 2005 bl uuuu u00u1 u #d
100 1 $aKELLER, M.
245 $aSoil-atmosphere exchange of nitrous oxide, nitric oxide, methane, and carbon dioxide in logged and undisturbed forest in the Tapajos National Forest, Brazil.$h[electronic resource]
260 $c2005
520 $aSelective logging is an extensive land use in the Brazilian Amazon region. The soil?atmosphere fluxes of nitrous oxide (N2O), nitric oxide (NO), methane (CH4), and carbon dioxide (CO2) are studied on two soil types (clay Oxisol and sandy loam Ultisol) over two years (2000?01) in both undisturbed forest and forest recently logged using reduced impact forest management in the Tapajos National Forest, near Santarem, Para, Brazil. In undisturbed forest, annual soil?atmosphere fluxes of N2O (mean ± standard error) were 7.9 ± 0.7 and 7.0 ± 0.6 ng N cm?2 h?1 for the Oxisol and 1.7 ± 0.1 and 1.6 ± 0.3 ng N cm?2 h?1 for the Ultisol for 2000 and 2001, respectively. The annual fluxes of NO from undisturbed forest soil in 2001 were 9.0 ± 2.8 ng N cm?2 h?1 for the Oxisol and 8.8 ± 5.0 ng N cm?2 h?1 for the Ultisol. Consumption of CH4 from the atmosphere dominated over production on undisturbed forest soils. Fluxes averaged ?0.3 ± 0.2 and ?0.1 ± 0.9 mg CH4 m?2 day?1 on the Oxisol and ?1.0 ± 0.2 and ?0.9 ± 0.3 mg CH4 m?2 day?1 on the Ultisol for years 2000 and 2001. For CO2 in 2001, the annual fluxes averaged 3.6 ± 0.4 ?mol m?2 s?1 on the Oxisol and 4.9 ± 1.1 ?mol m?2 s?1 on the Ultisol. We measured fluxes over one year each from two recently logged forests on the Oxisol in 2000 and on the Ultisol in 2001. Sampling in logged areas was stratified from greatest to least ground disturbance covering log decks, skid trails, tree-fall gaps, and forest matrix. Areas of strong soil compaction, especially the skid trails and logging decks, were prone to significantly greater emissions of N2O, NO, and especially CH4. In the case of CH4, estimated annual emissions from decks reached extremely high rates of 531 ± 419 and 98 ± 41 mg CH4 m?2 day?1, for Oxisol and Ultisol sites, respectively, comparable to wetland emissions in the region. We calculated excess fluxes from logged areas by subtraction of a background forest matrix or undisturbed forest flux and adjusted these fluxes for the proportional area of ground disturbance. Our calculations suggest that selective logging increases emissions of N2O and NO from 30% to 350% depending upon conditions. While undisturbed forest was a CH4 sink, logged forest tended to emit methane at moderate rates. Soil?atmosphere CO2 fluxes were only slightly affected by logging. The regional effects of logging cannot be simply extrapolated based upon one site. We studied sites where reduced impact harvest management was used while in typical conventional logging ground damage is twice as great. Even so, our results indicate that for N2O, NO, and CH4, logging disturbance may be as important for regional budgets of these gases as other extensive land-use changes in the Amazon such as the conversion of forest to cattle pasture.
650 $aFloresta Tropical
653 $aTrace gas
700 1 $aVARNER, R.
700 1 $aDIAS, J. D.
700 1 $aSILVA, H.
700 1 $aCRILL, P.
700 1 $aOLIVEIRA JUNIOR, R. C. de
700 1 $aASNER, G. P.
773 $tEarth Interactions$gv. 9, n. 23, p. 1-28, Nov. 2005.
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Registro original: |
Embrapa Amazônia Oriental (CPATU) |
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Registro Completo
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Biblioteca(s): |
Embrapa Hortaliças. |
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Data corrente: |
18/02/2021 |
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Data da última atualização: |
02/02/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
B - 1 |
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Autoria: |
SANTOS, F. N. dos; DUARTE, L. N.; SAMBORSKI, T.; MELLO, A. F. S.; KRINGEL, D. H.; SEVERO, J. |
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Afiliação: |
FELIPE NARDO DOS SANTOS, UNIVERSIDADE FEDERAL DE PELOTAS; LUCAS NACHTIGAL DUARTE, INSTITUTO FEDERAL FARROUPILHA, CAMPUS SANTO AUGUSTO.; TARCÍSIO SAMBORSKI, UNIVERSIDADE FEDERAL DE PELOTAS; ALEXANDRE FURTADO SILVEIRA MELLO, CNPH; KIANINI HÜTTENER KRINGEL, UNIVERSIDADE ESTADUAL DE SANTA CATARINA; JOSEANA SEVERO, INSTITUTO FEDERAL FARROUPILHA, CAMPUS SANTA ROSA. |
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Título: |
Elaboration of food products with biofortified sweet potatoes: characterization and sensory acceptability. |
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Ano de publicação: |
2021 |
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Fonte/Imprenta: |
Revista Chilena de Nutrición, v. 48, n. 1, p. 59-66, 2021. |
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ISSN: |
0717-7518 |
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Idioma: |
Inglês |
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Conteúdo: |
Beauregard sweet potato is an orange color crop rich in β-carotene, a precursor of vitamin A. β-carotene improve immunity and decrease of incidence of degenerative diseases. The objective of this work was to introduce sweet potato in the diet through of some food products, such as bread, cake and sweets. The effect of processing on the chemical composition, as well as the quantification of phenols and total carotenoids, antioxidant activity, and sensory acceptability were evaluated. Cakes and coconut sweets presented higher levels of carotenoids. Higher phenolic and antioxidant activity were verified in cocoa sweets. All foods had good acceptability: 86% for bread, 83.3% for cake and 84,4%, and 86% for coconut and cocoa sweets, respectively. Servings of 95g of roasted sweet potato, 330g of bread, 182g of cake, 187g of coconut sweet and 391g end of cocoa sweet, would provide the recommended daily intake of vitamin A for children 10 years and older. It was concluded that the elaboration of foods containing sweet potato is a viable alternative to inserting biofortified foods into the human diet. |
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Palavras-Chave: |
Cultivar Beauregard. |
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Thesagro: |
Análise de Alimento; Batata Doce; Carotenóide; Ipomoea Batatas; Vitamina A. |
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Thesaurus NAL: |
Antioxidant activity; Beta-carotene; Cakes; Phenols; Sweet potatoes; Sweets. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/221238/1/06-1151-Santos-59-66.pdf
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Marc: |
LEADER 02067naa a2200337 a 4500
001 2130067
005 2022-02-02
008 2021 bl uuuu u00u1 u #d
022 $a0717-7518
100 1 $aSANTOS, F. N. dos
245 $aElaboration of food products with biofortified sweet potatoes$bcharacterization and sensory acceptability.$h[electronic resource]
260 $c2021
520 $aBeauregard sweet potato is an orange color crop rich in β-carotene, a precursor of vitamin A. β-carotene improve immunity and decrease of incidence of degenerative diseases. The objective of this work was to introduce sweet potato in the diet through of some food products, such as bread, cake and sweets. The effect of processing on the chemical composition, as well as the quantification of phenols and total carotenoids, antioxidant activity, and sensory acceptability were evaluated. Cakes and coconut sweets presented higher levels of carotenoids. Higher phenolic and antioxidant activity were verified in cocoa sweets. All foods had good acceptability: 86% for bread, 83.3% for cake and 84,4%, and 86% for coconut and cocoa sweets, respectively. Servings of 95g of roasted sweet potato, 330g of bread, 182g of cake, 187g of coconut sweet and 391g end of cocoa sweet, would provide the recommended daily intake of vitamin A for children 10 years and older. It was concluded that the elaboration of foods containing sweet potato is a viable alternative to inserting biofortified foods into the human diet.
650 $aAntioxidant activity
650 $aBeta-carotene
650 $aCakes
650 $aPhenols
650 $aSweet potatoes
650 $aSweets
650 $aAnálise de Alimento
650 $aBatata Doce
650 $aCarotenóide
650 $aIpomoea Batatas
650 $aVitamina A
653 $aCultivar Beauregard
700 1 $aDUARTE, L. N.
700 1 $aSAMBORSKI, T.
700 1 $aMELLO, A. F. S.
700 1 $aKRINGEL, D. H.
700 1 $aSEVERO, J.
773 $tRevista Chilena de Nutrición$gv. 48, n. 1, p. 59-66, 2021.
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