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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: |
23/11/2011 |
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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: |
DAVIDSON, E.; LEFEBVRE, P. A.; BRANDO, P. M.; RAY, D. M.; TRUMBORE, S. E.; SOLORZANO, L. A.; FERREIRA, J. N.; BUSTAMANTE, M. M. da C.; NEPSTAD, D. C. |
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Afiliação: |
Eric A. Davidson, Woods Hole Research Center; Paul A. Lefebvre, Woods Hole Research Center; Paulo M. Brando, IPAM; David Ray, Tall Timbers Research Station; Susan E. Trumbore, University of California; Luis A. Solorzano, The Gordon and Betty Moore Foundation; JOICE NUNES FERREIRA, CPATU; Mercedes M. da C. Bustamante, UNB; Daniel C. Nepstad, The Woods Hole Research Center. |
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Título: |
Carbon inputs and water uptake in deep soils of an Eastern Amazon forest. |
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Ano de publicação: |
2011 |
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Fonte/Imprenta: |
Forest Science, v. 57, n. 1, p. 51-58, Feb. 2011. |
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Idioma: |
Inglês |
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Conteúdo: |
Rooting depth affects soil profiles of water uptake and carbon inputs. Here we explore the importance of deep roots in a mature tropical forest of eastern Amazonia, where a throughfall exclusion experiment was conducted to test the resilience of the forest to experimentally induced drought. We hypothesized that soil water depletion occurred below the depth previously measured by sensors in 11-m-deep soil pits and that only a small root biomass is necessary to affect water uptake and the isotopic signature of soil CO2. A noninvasive electrical profiling method demonstrated greater depletion of soil water in the 11?18 m depth increment in the exclusion plot compared with the control plot by the end of the 3rd year of the experiment. A fine root biomass of only 0.1 g/cm3 measured at 3?6 m was sufficient for soil water drawdown and for imparting an isotopic signature of modern soil 14CO2 in both plots. A soil 13CO2 profile indicated drought stress in the exclusion plot. Fine root inputs of organic C to deep soils are small with respect to the carbon dynamics of the forest, but the deep rooting habit clearly affects the ecosystem water balance and profiles of soil CO2. FOR. SCI. 57(1):51?58. |
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Palavras-Chave: |
Co2. |
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Thesagro: |
Água; Matéria Orgânica; Solo. |
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Categoria do assunto: |
K Ciência Florestal e Produtos de Origem Vegetal |
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Marc: |
LEADER 01928naa a2200265 a 4500
001 1906991
005 2022-11-11
008 2011 bl uuuu u00u1 u #d
100 1 $aDAVIDSON, E.
245 $aCarbon inputs and water uptake in deep soils of an Eastern Amazon forest.$h[electronic resource]
260 $c2011
520 $aRooting depth affects soil profiles of water uptake and carbon inputs. Here we explore the importance of deep roots in a mature tropical forest of eastern Amazonia, where a throughfall exclusion experiment was conducted to test the resilience of the forest to experimentally induced drought. We hypothesized that soil water depletion occurred below the depth previously measured by sensors in 11-m-deep soil pits and that only a small root biomass is necessary to affect water uptake and the isotopic signature of soil CO2. A noninvasive electrical profiling method demonstrated greater depletion of soil water in the 11?18 m depth increment in the exclusion plot compared with the control plot by the end of the 3rd year of the experiment. A fine root biomass of only 0.1 g/cm3 measured at 3?6 m was sufficient for soil water drawdown and for imparting an isotopic signature of modern soil 14CO2 in both plots. A soil 13CO2 profile indicated drought stress in the exclusion plot. Fine root inputs of organic C to deep soils are small with respect to the carbon dynamics of the forest, but the deep rooting habit clearly affects the ecosystem water balance and profiles of soil CO2. FOR. SCI. 57(1):51?58.
650 $aÁgua
650 $aMatéria Orgânica
650 $aSolo
653 $aCo2
700 1 $aLEFEBVRE, P. A.
700 1 $aBRANDO, P. M.
700 1 $aRAY, D. M.
700 1 $aTRUMBORE, S. E.
700 1 $aSOLORZANO, L. A.
700 1 $aFERREIRA, J. N.
700 1 $aBUSTAMANTE, M. M. da C.
700 1 $aNEPSTAD, D. C.
773 $tForest Science$gv. 57, n. 1, p. 51-58, Feb. 2011.
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Registro original: |
Embrapa Amazônia Oriental (CPATU) |
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Tipo/Formato |
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Registro |
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| Acesso ao texto completo restrito à biblioteca da Embrapa Solos. Para informações adicionais entre em contato com cnps.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Solos. |
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Data corrente: |
07/02/2014 |
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Data da última atualização: |
07/02/2014 |
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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: |
XUE-YU, H.; VASQUES, G. de M.; GRUNWALD, S. |
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Afiliação: |
H Xue-Yu; GUSTAVO DE MATTOS VASQUES, CNPS. |
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Título: |
Application of visible/near-Infrared spectra in modeling of soil Total phosphorus. |
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Ano de publicação: |
2013 |
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Fonte/Imprenta: |
Pedosphere, China v. 23, n. 4, p. 417- 421, 2013. |
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Páginas: |
5p. |
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ISSN: |
1002-0160 |
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Idioma: |
Português |
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Conteúdo: |
Overabundance of phosphorus (P) in soils and water is of great concern and has received much attention in Florida, USA. Therefore, it is essential to analyze and predict the distribution of P in soils across large areas. This study was undertaken to model the variation of soil total phosphorus (TP) in Florida. A total of 448 soil samples were collected from different soil types. Soil samples were analyzed by chemical reference method and scanned in the visible/near-infrared (VNIR) region of 350?2 500 nm. Partial least squares regression (PLSR) calibration model was developed between chemical reference values and VNIR values. The coefficient of determination (R2) and the root mean squares error (RMSE) of calibration and validation sets, and the residual prediction deviation (RPD) were used to evaluate the models. The R2 in calibration and validation for log-transformed TP (log TP) were 0.69 and 0.65, respectively, indicating that VNIR calibration obtained in this study accounted for at least 65% of the variance in log TP using only VNIR spectra, and the high RPD of 2.82 obtained suggested that the spectral model derived in this study was suitable and robust to predict TP in a wide range of soil types, being representative of Florida soil conditions. |
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Palavras-Chave: |
Partial least square regression; Spectral model; Visible/near-infrared spectroscopy. |
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Thesaurus NAL: |
Florida; prediction. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
LEADER 01934naa a2200229 a 4500
001 1979091
005 2014-02-07
008 2013 bl uuuu u00u1 u #d
022 $a1002-0160
100 1 $aXUE-YU, H.
245 $aApplication of visible/near-Infrared spectra in modeling of soil Total phosphorus.$h[electronic resource]
260 $c2013
300 $a5p.
520 $aOverabundance of phosphorus (P) in soils and water is of great concern and has received much attention in Florida, USA. Therefore, it is essential to analyze and predict the distribution of P in soils across large areas. This study was undertaken to model the variation of soil total phosphorus (TP) in Florida. A total of 448 soil samples were collected from different soil types. Soil samples were analyzed by chemical reference method and scanned in the visible/near-infrared (VNIR) region of 350?2 500 nm. Partial least squares regression (PLSR) calibration model was developed between chemical reference values and VNIR values. The coefficient of determination (R2) and the root mean squares error (RMSE) of calibration and validation sets, and the residual prediction deviation (RPD) were used to evaluate the models. The R2 in calibration and validation for log-transformed TP (log TP) were 0.69 and 0.65, respectively, indicating that VNIR calibration obtained in this study accounted for at least 65% of the variance in log TP using only VNIR spectra, and the high RPD of 2.82 obtained suggested that the spectral model derived in this study was suitable and robust to predict TP in a wide range of soil types, being representative of Florida soil conditions.
650 $aFlorida
650 $aprediction
653 $aPartial least square regression
653 $aSpectral model
653 $aVisible/near-infrared spectroscopy
700 1 $aVASQUES, G. de M.
700 1 $aGRUNWALD, S.
773 $tPedosphere, China$gv. 23, n. 4, p. 417- 421, 2013.
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Embrapa Solos (CNPS) |
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