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Registro Completo |
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Biblioteca(s): |
Embrapa Florestas. |
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Data corrente: |
06/06/1995 |
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Data da última atualização: |
18/03/2009 |
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Autoria: |
LIMA, W. de P. |
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Título: |
Hydrologic behavior of two small watersheds in West Virginia undergoing natural reforestation. |
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Ano de publicação: |
1971 |
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Fonte/Imprenta: |
1971. |
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Páginas: |
144 f. |
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Idioma: |
Inglês |
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Notas: |
Thesis (Master of Science) - The Ohio State University. |
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Conteúdo: |
Thirteen years of precipitacion and stream flow data from two water sheds from timber and Watershed Laboratory, in Parsons, West Virginia, were analyzed to determine the effectos of natural reforestation of former pastured and cultivated lands on streamflow.The watersheds were incorporated into the Monongahela National Forest about the year of 1940, and since then approximately 70 percent of their areas have reverted naturally to mexed hardwood forest cover.Streamflow measurement, hower, did not start until the year of 1957, and, therefore, the analyses in the present study do not encompass the entire period of forest development. Results of the analyses show an indication of reduction in the annual and dormant season streamflow from both watersheds between the period, 1957-1971, and all of the indicated annual reduction ocurred primarily in the dormant season period. This pattern of streamflow reduction would be explained in terms of an increase in soil water utilization by the increased forest cover, with would them require more of the dormant season precipitation to replenish the soil moisture deficit created during growing season before any surplus water was available for streamflow. None of indicated trends of streamflow with time, however, were statistically significant. Based on the findings of similar, earlier studies, and also on the results of the survey of the vegetation development in the study watersheds, it was believed that the major part of the change in streamflow had already occurred before 1957, that is, during the periods of initial and more rapid change in the cover conditions of the area. This assumption, coupled with the relatively short period of streamflow meassurement considered in the analysis, would it very difficult to significantly detect a possible change in streamflow. The Thornth waite water balance computed for the study watersheds showed that during the period of study, from an average annual precipitation of 58.4 inches, the mean annual evapotranspiration accounted for 24.3 inches, giving an annual water of 34.1 inches, which represents the water available for streamflow. From the total, annual streamflow yielded by study watersheds, 75 percent accurred in dormant season period, and 25 percent in the growing season period. During the interval, 1957-1971, therefore low flow regime of the study watersheds was practically unaffected, and high flow regime showed a slight, non-significant, downward trend. MenosThirteen years of precipitacion and stream flow data from two water sheds from timber and Watershed Laboratory, in Parsons, West Virginia, were analyzed to determine the effectos of natural reforestation of former pastured and cultivated lands on streamflow.The watersheds were incorporated into the Monongahela National Forest about the year of 1940, and since then approximately 70 percent of their areas have reverted naturally to mexed hardwood forest cover.Streamflow measurement, hower, did not start until the year of 1957, and, therefore, the analyses in the present study do not encompass the entire period of forest development. Results of the analyses show an indication of reduction in the annual and dormant season streamflow from both watersheds between the period, 1957-1971, and all of the indicated annual reduction ocurred primarily in the dormant season period. This pattern of streamflow reduction would be explained in terms of an increase in soil water utilization by the increased forest cover, with would them require more of the dormant season precipitation to replenish the soil moisture deficit created during growing season before any surplus water was available for streamflow. None of indicated trends of streamflow with time, however, were statistically significant. Based on the findings of similar, earlier studies, and also on the results of the survey of the vegetation development in the study watersheds, it was believed that the major part of the change in stre... Mostrar Tudo |
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Palavras-Chave: |
Comportamento hidrológico; Riparian vegetation. |
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Thesagro: |
Mata Ciliar; Regeneração Natural. |
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Thesaurus Nal: |
natural regeneration; watersheds. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 03092nam a2200205 a 4500
001 1304979
005 2009-03-18
008 1971 bl uuuu m 00u1 u #d
100 1 $aLIMA, W. de P.
245 $aHydrologic behavior of two small watersheds in West Virginia undergoing natural reforestation.
260 $a1971.$c1971
300 $a144 f.
500 $aThesis (Master of Science) - The Ohio State University.
520 $aThirteen years of precipitacion and stream flow data from two water sheds from timber and Watershed Laboratory, in Parsons, West Virginia, were analyzed to determine the effectos of natural reforestation of former pastured and cultivated lands on streamflow.The watersheds were incorporated into the Monongahela National Forest about the year of 1940, and since then approximately 70 percent of their areas have reverted naturally to mexed hardwood forest cover.Streamflow measurement, hower, did not start until the year of 1957, and, therefore, the analyses in the present study do not encompass the entire period of forest development. Results of the analyses show an indication of reduction in the annual and dormant season streamflow from both watersheds between the period, 1957-1971, and all of the indicated annual reduction ocurred primarily in the dormant season period. This pattern of streamflow reduction would be explained in terms of an increase in soil water utilization by the increased forest cover, with would them require more of the dormant season precipitation to replenish the soil moisture deficit created during growing season before any surplus water was available for streamflow. None of indicated trends of streamflow with time, however, were statistically significant. Based on the findings of similar, earlier studies, and also on the results of the survey of the vegetation development in the study watersheds, it was believed that the major part of the change in streamflow had already occurred before 1957, that is, during the periods of initial and more rapid change in the cover conditions of the area. This assumption, coupled with the relatively short period of streamflow meassurement considered in the analysis, would it very difficult to significantly detect a possible change in streamflow. The Thornth waite water balance computed for the study watersheds showed that during the period of study, from an average annual precipitation of 58.4 inches, the mean annual evapotranspiration accounted for 24.3 inches, giving an annual water of 34.1 inches, which represents the water available for streamflow. From the total, annual streamflow yielded by study watersheds, 75 percent accurred in dormant season period, and 25 percent in the growing season period. During the interval, 1957-1971, therefore low flow regime of the study watersheds was practically unaffected, and high flow regime showed a slight, non-significant, downward trend.
650 $anatural regeneration
650 $awatersheds
650 $aMata Ciliar
650 $aRegeneração Natural
653 $aComportamento hidrológico
653 $aRiparian vegetation
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Registro original: |
Embrapa Florestas (CNPF) |
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Registro Completo
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Biblioteca(s): |
Embrapa Milho e Sorgo; Embrapa Unidades Centrais. |
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Data corrente: |
04/01/2002 |
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Data da última atualização: |
07/06/2018 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
GUARCONI, R. C.; DURAES, F. O. M.; MAGALHAES, P. C.; SILVA, R. F. da. |
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Afiliação: |
FREDERICO OZANAN MACHADO DURAES, SPM GGE; PAULO CESAR MAGALHAES, CNPMS. |
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Título: |
Efeito do armazenamento na qualidade fisiológica das sementes de populações de milho cultivadas sob estresses hídrico e mineral. |
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Ano de publicação: |
2001 |
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Fonte/Imprenta: |
Pesquisa Agropecuária Brasileira, Brasília, v. 36, n. 12, p. 1479-1484, dez. 2001. |
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Idioma: |
Português |
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Conteúdo: |
O objetivo deste trabalho foi avaliar o efeito do armazenamento na qualidade fisiologica de sementes de cinco populacoes de milho submetidas aos estresses de Al no solo e de seca no florescimento. Cinco populacoes de milho (CMS06, CMS35, CMS36, CMS54 e Milho Metro) foram cultivadas em solos com dois niveis de fertilidade: o primeiro, apresentando alta saturacao de bases (V = 67%), e o segundo, alta saturacao de Al (m = 54%). As populacoes de milho foram tambem submetidas a irrigacao plena e a supressao de irrigacao durante o florescimento. As sementes obtidas dessas populacoes foram armazenadas no laboratorio de sementes sob condicoes ambientais. A qualidade fisiologicas das sementes foi determinada no inicio e aos 30, 90 e 210 dias de armazenamento. As sementes da populacao CMS36 apresentaram maior vigor quando produzidas em solos com alta saturacao de aluminio. A populacao CMS54 foi a mais estavel com relacao a qualidade fisiologica das sementes produzidas em diferentes ambientes. As sementes das populacoes CMS35, CMS36, CMS54 e Milho Metro foram mais estaveis com relacao a qualidade fisiologica, durante o periodo de armazenamento, do que as da CMS06. |
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Palavras-Chave: |
Estresse hidrico; longevidade das sementes; Maize; Seed; seed longevity. |
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Thesagro: |
Alumínio; Armazenamento; Germinação; Longevidade; Milho; Seca; Semente; Solo; Zea Mays. |
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Thesaurus NAL: |
aluminum; drought; germination; longevity; soil. |
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Categoria do assunto: |
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F Plantas e Produtos de Origem Vegetal |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/160718/1/Efeito-armazenamento.pdf
https://ainfo.cnptia.embrapa.br/digital/bitstream/AI-SEDE/21000/1/1479.pdf
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Marc: |
LEADER 02209naa a2200385 a 4500
001 1485187
005 2018-06-07
008 2001 bl uuuu u00u1 u #d
100 1 $aGUARCONI, R. C.
245 $aEfeito do armazenamento na qualidade fisiológica das sementes de populações de milho cultivadas sob estresses hídrico e mineral.
260 $c2001
520 $aO objetivo deste trabalho foi avaliar o efeito do armazenamento na qualidade fisiologica de sementes de cinco populacoes de milho submetidas aos estresses de Al no solo e de seca no florescimento. Cinco populacoes de milho (CMS06, CMS35, CMS36, CMS54 e Milho Metro) foram cultivadas em solos com dois niveis de fertilidade: o primeiro, apresentando alta saturacao de bases (V = 67%), e o segundo, alta saturacao de Al (m = 54%). As populacoes de milho foram tambem submetidas a irrigacao plena e a supressao de irrigacao durante o florescimento. As sementes obtidas dessas populacoes foram armazenadas no laboratorio de sementes sob condicoes ambientais. A qualidade fisiologicas das sementes foi determinada no inicio e aos 30, 90 e 210 dias de armazenamento. As sementes da populacao CMS36 apresentaram maior vigor quando produzidas em solos com alta saturacao de aluminio. A populacao CMS54 foi a mais estavel com relacao a qualidade fisiologica das sementes produzidas em diferentes ambientes. As sementes das populacoes CMS35, CMS36, CMS54 e Milho Metro foram mais estaveis com relacao a qualidade fisiologica, durante o periodo de armazenamento, do que as da CMS06.
650 $aaluminum
650 $adrought
650 $agermination
650 $alongevity
650 $asoil
650 $aAlumínio
650 $aArmazenamento
650 $aGerminação
650 $aLongevidade
650 $aMilho
650 $aSeca
650 $aSemente
650 $aSolo
650 $aZea Mays
653 $aEstresse hidrico
653 $alongevidade das sementes
653 $aMaize
653 $aSeed
653 $aseed longevity
700 1 $aDURAES, F. O. M.
700 1 $aMAGALHAES, P. C.
700 1 $aSILVA, R. F. da
773 $tPesquisa Agropecuária Brasileira, Brasília$gv. 36, n. 12, p. 1479-1484, dez. 2001.
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Registro original: |
Embrapa Milho e Sorgo (CNPMS) |
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