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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: |
17/10/2011 |
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Data da última atualização: |
11/11/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
MARKEWITZ, D.; LAMON, E. C.; BUSTAMANTE, M. C.; CHAVES, J.; FIGUEIREDO, R. O.; JOHNSON, M. S.; KRUSCHE, A.; NEILL, C.; SILVA, J. S. O. |
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Afiliação: |
DANIEL MARKEWITZ, UNIVERSITY OF GEORGIA; E. CONTAD LAMON III, STATISTICAL ECOLOGY ASSOCIATES LLC; MERCEDES C. BUSTAMANTE, UNB; JOAQUIM CHAVES, ECOSYSTEMS CENTER; RICARDO DE OLIVEIRA FIGUEIREDO, CPATU; MARK S. JOHNSON, UNIVERSITY OF BRITISH COLUMBIA; ALEX KRUSCHE, USP/CENA; CHRISTOPHER NEILL, ECOSYSTEMS CENTER; JOSÉ S. O. SILVA, UNB. |
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Título: |
Discharge-calcium concentration relationships in streams of the Amazon and Cerrado of Brazil: soil or land use controlled. |
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Ano de publicação: |
2011 |
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Fonte/Imprenta: |
Biogeochemistry, Dordrecht, v. 105, n. 1-3, p. 19-35, Sep. 2011. |
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DOI: |
10.1007/s10533-011-9574-2 |
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Idioma: |
Inglês |
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Conteúdo: |
Stream discharge?concentration relationships are indicators of terrestrial ecosystem function. Throughout the Amazon and Cerrado regions of Brazil rapid changes in land use and land cover may be altering these hydrochemical relationships. The current analysis focuses on factors controlling the discharge?calcium (Ca) concentration relationship since previous research in these regions has demonstrated both positive and negative slopes in linear log10discharge?log10Ca concentration regressions. The objective of the current study was to evaluate factors controlling stream discharge?Ca concentration relationships including year, season, stream order, vegetation cover, land use, and soil classification. It was hypothesized that land use and soil class are the most critical attributes controlling discharge?Ca concentration relationships. A multilevel, linear regression approach was utilized with data from 28 streams throughout Brazil. These streams come from three distinct regions and varied broadly in watershed size (<1 to >106 ha) and discharge (10−5.7?103.2 m3 s−1). Linear regressions of log10Ca versus log10discharge in 13 streams have a preponderance of negative slopes with only two streams having significant positive slopes. An ANOVA decomposition suggests the effect of discharge on Ca concentration is large but variable. Vegetation cover, which incorporates aspects of land use, explains the largest proportion of the variance in the effect of discharge on Ca followed by season and year. In contrast, stream order, land use, and soil class explain most of the variation in stream Ca concentration. In the current data set, soil class, which is related to lithology, has an important effect on Ca concentration but land use, likely through its effect on runoff concentration and hydrology, has a greater effect on discharge?concentration relationships. MenosStream discharge?concentration relationships are indicators of terrestrial ecosystem function. Throughout the Amazon and Cerrado regions of Brazil rapid changes in land use and land cover may be altering these hydrochemical relationships. The current analysis focuses on factors controlling the discharge?calcium (Ca) concentration relationship since previous research in these regions has demonstrated both positive and negative slopes in linear log10discharge?log10Ca concentration regressions. The objective of the current study was to evaluate factors controlling stream discharge?Ca concentration relationships including year, season, stream order, vegetation cover, land use, and soil classification. It was hypothesized that land use and soil class are the most critical attributes controlling discharge?Ca concentration relationships. A multilevel, linear regression approach was utilized with data from 28 streams throughout Brazil. These streams come from three distinct regions and varied broadly in watershed size (<1 to >106 ha) and discharge (10−5.7?103.2 m3 s−1). Linear regressions of log10Ca versus log10discharge in 13 streams have a preponderance of negative slopes with only two streams having significant positive slopes. An ANOVA decomposition suggests the effect of discharge on Ca concentration is large but variable. Vegetation cover, which incorporates aspects of land use, explains the largest proportion of the variance in the effect of discharge on Ca follow... Mostrar Tudo |
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Palavras-Chave: |
Brasil; Multilevel linear model. |
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Thesagro: |
Cálcio; Uso da Terra. |
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Thesaurus Nal: |
Brazil; calcium; land use. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
LEADER 02798naa a2200313 a 4500
001 1903277
005 2022-11-11
008 2011 bl uuuu u00u1 u #d
024 7 $a10.1007/s10533-011-9574-2$2DOI
100 1 $aMARKEWITZ, D.
245 $aDischarge-calcium concentration relationships in streams of the Amazon and Cerrado of Brazil$bsoil or land use controlled.$h[electronic resource]
260 $c2011
520 $aStream discharge?concentration relationships are indicators of terrestrial ecosystem function. Throughout the Amazon and Cerrado regions of Brazil rapid changes in land use and land cover may be altering these hydrochemical relationships. The current analysis focuses on factors controlling the discharge?calcium (Ca) concentration relationship since previous research in these regions has demonstrated both positive and negative slopes in linear log10discharge?log10Ca concentration regressions. The objective of the current study was to evaluate factors controlling stream discharge?Ca concentration relationships including year, season, stream order, vegetation cover, land use, and soil classification. It was hypothesized that land use and soil class are the most critical attributes controlling discharge?Ca concentration relationships. A multilevel, linear regression approach was utilized with data from 28 streams throughout Brazil. These streams come from three distinct regions and varied broadly in watershed size (<1 to >106 ha) and discharge (10−5.7?103.2 m3 s−1). Linear regressions of log10Ca versus log10discharge in 13 streams have a preponderance of negative slopes with only two streams having significant positive slopes. An ANOVA decomposition suggests the effect of discharge on Ca concentration is large but variable. Vegetation cover, which incorporates aspects of land use, explains the largest proportion of the variance in the effect of discharge on Ca followed by season and year. In contrast, stream order, land use, and soil class explain most of the variation in stream Ca concentration. In the current data set, soil class, which is related to lithology, has an important effect on Ca concentration but land use, likely through its effect on runoff concentration and hydrology, has a greater effect on discharge?concentration relationships.
650 $aBrazil
650 $acalcium
650 $aland use
650 $aCálcio
650 $aUso da Terra
653 $aBrasil
653 $aMultilevel linear model
700 1 $aLAMON, E. C.
700 1 $aBUSTAMANTE, M. C.
700 1 $aCHAVES, J.
700 1 $aFIGUEIREDO, R. O.
700 1 $aJOHNSON, M. S.
700 1 $aKRUSCHE, A.
700 1 $aNEILL, C.
700 1 $aSILVA, J. S. O.
773 $tBiogeochemistry, Dordrecht$gv. 105, n. 1-3, p. 19-35, Sep. 2011.
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