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Registro Completo |
Biblioteca(s): |
Embrapa Amapá. |
Data corrente: |
24/02/2015 |
Data da última atualização: |
29/05/2019 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Autoria: |
VICCA, S.; BAHN, M.; ESTIARTE, M.; VAN LOON, E. E.; VARGAS, R.; ALBERTI, G.; AMBUS, P.; ARAIN, M. A.; BEIER, C.; BENTLEY, L. P.; BORKEN, W.; BUCHMANN, N.; COLLINS, S. L.; GATO, G. de; DUKES, J. S.; ESCOLAR, C.; FAY, P.; GUIDOLOTTI, G.; HANSON, P. J.; KAHMEN, A.; KRÖEL-DULAY, G.; LADREITER-KNAUSS, T.; LARSEN, K. S.; LELLEI-KOVACS, E.; LEBRIJA-TREJOS, E.; MAESTRE, F. T.; MARHAN, S.; MARSHALL, M.; MEIR, P.; MIAO, Y.; MUHR, J.; NIKLAUS, P. A.; OGAYA, R.; PEÑUELAS, J.; POLL, C.; RUSTAD, L. E.; SAVAGE, K.; SCHINDLBACHER, A.; SCHMIDT, I. K.; SMITH, A. R.; SOTTA, E. D.; SUSEELA, V.; TIETEMA, A.; VAN GESTEL, N.; VAN STRAATEN, O.; WAN, S.; WEBER, U.; JANSSENS, I. A. |
Afiliação: |
ELENEIDE DOFF SOTTA, CPAF-AP. |
Título: |
Can current moisture responses predict soil CO2 efflux under altered precipitation regimes? A synthesis of manipulation experiments. |
Ano de publicação: |
2014 |
Fonte/Imprenta: |
Biogeosciences, v. 11, n. 11, p. 2991-3013, 2014. |
Idioma: |
Inglês |
Conteúdo: |
As a key component of the carbon cycle, soil CO2 efflux (SCE) is being increasingly studied to improve our mechanistic understanding of this important carbon flux. Predicting ecosystem responses to climate change often depends on extrapolation of current relationships between ecosystem processes and their climatic drivers to conditions not yet experienced by the ecosystem. This raises the question of to what extent these relationships remain unaltered beyond the current climatic window for which observations are available to constrain the relationships. Here, we evaluate whether current responses of SCE to fluctuations in soil temperature and soil water content can be used to predict SCE under altered rainfall patterns. Of the 58 experiments for which we gathered SCE data, 20 were discarded because either too few data were available or inconsistencies precluded their incorporation in the analyses. The 38 remaining experiments were used to test the hypothesis that a model parameterized with data from the control plots (using soil temperature and water content as predictor variables) could adequately predict SCE measured in the manipulated treatment. Only for 7 of these 38 experiments was this hypothesis rejected. Importantly, these were the experiments with the most reliable data sets, i.e., those providing high-frequency measurements of SCE. Regression tree analysis demonstrated that our hypothesis could be rejected only for experiments with measurement intervals of less than 11 days, and was not rejected for any of the 24 experiments with larger measurement intervals. This highlights the importance of high-frequency measurements when studying effects of altered precipitation on SCE, probably because infrequent measurement schemes have insufficient capacity to detect shifts in the climate dependencies of SCE. Hence, the most justified answer to the question of whether current moisture responses of SCE can be extrapolated to predict SCE under altered precipitation regimes is ?no? ? as based on the most reliable data sets available. We strongly recommend that future experiments focus more strongly on establishing response functions across a broader range of precipitation regimes and soil moisture conditions. Such experiments should make accurate measurements of water availability, should conduct high-frequency SCE measurements, and should consider both instantaneous responses and the potential legacy effects of climate extremes. This is important, because with the novel approach presented here, we demonstrated that, at least for some ecosystems, current moisture responses could not be extrapolated to predict SCE under altered rainfall conditions. MenosAs a key component of the carbon cycle, soil CO2 efflux (SCE) is being increasingly studied to improve our mechanistic understanding of this important carbon flux. Predicting ecosystem responses to climate change often depends on extrapolation of current relationships between ecosystem processes and their climatic drivers to conditions not yet experienced by the ecosystem. This raises the question of to what extent these relationships remain unaltered beyond the current climatic window for which observations are available to constrain the relationships. Here, we evaluate whether current responses of SCE to fluctuations in soil temperature and soil water content can be used to predict SCE under altered rainfall patterns. Of the 58 experiments for which we gathered SCE data, 20 were discarded because either too few data were available or inconsistencies precluded their incorporation in the analyses. The 38 remaining experiments were used to test the hypothesis that a model parameterized with data from the control plots (using soil temperature and water content as predictor variables) could adequately predict SCE measured in the manipulated treatment. Only for 7 of these 38 experiments was this hypothesis rejected. Importantly, these were the experiments with the most reliable data sets, i.e., those providing high-frequency measurements of SCE. Regression tree analysis demonstrated that our hypothesis could be rejected only for experiments with measurement intervals of less tha... Mostrar Tudo |
Palavras-Chave: |
Rainfall. |
Thesagro: |
Mudança Climática; Precipitação pluvial; Solo; Umidade. |
Thesaurus Nal: |
climate change; humidity; soil. |
Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/118934/1/CAP-AP-2014-Can-current-moisture.pdf
|
Marc: |
LEADER 04700naa a2200781 a 4500 001 2009572 005 2019-05-29 008 2014 bl uuuu u00u1 u #d 100 1 $aVICCA, S. 245 $aCan current moisture responses predict soil CO2 efflux under altered precipitation regimes? A synthesis of manipulation experiments.$h[electronic resource] 260 $c2014 520 $aAs a key component of the carbon cycle, soil CO2 efflux (SCE) is being increasingly studied to improve our mechanistic understanding of this important carbon flux. Predicting ecosystem responses to climate change often depends on extrapolation of current relationships between ecosystem processes and their climatic drivers to conditions not yet experienced by the ecosystem. This raises the question of to what extent these relationships remain unaltered beyond the current climatic window for which observations are available to constrain the relationships. Here, we evaluate whether current responses of SCE to fluctuations in soil temperature and soil water content can be used to predict SCE under altered rainfall patterns. Of the 58 experiments for which we gathered SCE data, 20 were discarded because either too few data were available or inconsistencies precluded their incorporation in the analyses. The 38 remaining experiments were used to test the hypothesis that a model parameterized with data from the control plots (using soil temperature and water content as predictor variables) could adequately predict SCE measured in the manipulated treatment. Only for 7 of these 38 experiments was this hypothesis rejected. Importantly, these were the experiments with the most reliable data sets, i.e., those providing high-frequency measurements of SCE. Regression tree analysis demonstrated that our hypothesis could be rejected only for experiments with measurement intervals of less than 11 days, and was not rejected for any of the 24 experiments with larger measurement intervals. This highlights the importance of high-frequency measurements when studying effects of altered precipitation on SCE, probably because infrequent measurement schemes have insufficient capacity to detect shifts in the climate dependencies of SCE. Hence, the most justified answer to the question of whether current moisture responses of SCE can be extrapolated to predict SCE under altered precipitation regimes is ?no? ? as based on the most reliable data sets available. We strongly recommend that future experiments focus more strongly on establishing response functions across a broader range of precipitation regimes and soil moisture conditions. Such experiments should make accurate measurements of water availability, should conduct high-frequency SCE measurements, and should consider both instantaneous responses and the potential legacy effects of climate extremes. This is important, because with the novel approach presented here, we demonstrated that, at least for some ecosystems, current moisture responses could not be extrapolated to predict SCE under altered rainfall conditions. 650 $aclimate change 650 $ahumidity 650 $asoil 650 $aMudança Climática 650 $aPrecipitação pluvial 650 $aSolo 650 $aUmidade 653 $aRainfall 700 1 $aBAHN, M. 700 1 $aESTIARTE, M. 700 1 $aVAN LOON, E. E. 700 1 $aVARGAS, R. 700 1 $aALBERTI, G. 700 1 $aAMBUS, P. 700 1 $aARAIN, M. A. 700 1 $aBEIER, C. 700 1 $aBENTLEY, L. P. 700 1 $aBORKEN, W. 700 1 $aBUCHMANN, N. 700 1 $aCOLLINS, S. L. 700 1 $aGATO, G. de 700 1 $aDUKES, J. S. 700 1 $aESCOLAR, C. 700 1 $aFAY, P. 700 1 $aGUIDOLOTTI, G. 700 1 $aHANSON, P. J. 700 1 $aKAHMEN, A. 700 1 $aKRÖEL-DULAY, G. 700 1 $aLADREITER-KNAUSS, T. 700 1 $aLARSEN, K. S. 700 1 $aLELLEI-KOVACS, E. 700 1 $aLEBRIJA-TREJOS, E. 700 1 $aMAESTRE, F. T. 700 1 $aMARHAN, S. 700 1 $aMARSHALL, M. 700 1 $aMEIR, P. 700 1 $aMIAO, Y. 700 1 $aMUHR, J. 700 1 $aNIKLAUS, P. A. 700 1 $aOGAYA, R. 700 1 $aPEÑUELAS, J. 700 1 $aPOLL, C. 700 1 $aRUSTAD, L. E. 700 1 $aSAVAGE, K. 700 1 $aSCHINDLBACHER, A. 700 1 $aSCHMIDT, I. K. 700 1 $aSMITH, A. R. 700 1 $aSOTTA, E. D. 700 1 $aSUSEELA, V. 700 1 $aTIETEMA, A. 700 1 $aVAN GESTEL, N. 700 1 $aVAN STRAATEN, O. 700 1 $aWAN, S. 700 1 $aWEBER, U. 700 1 $aJANSSENS, I. A. 773 $tBiogeosciences$gv. 11, n. 11, p. 2991-3013, 2014.
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Embrapa Amapá (CPAF-AP) |
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Biblioteca(s): |
Embrapa Hortaliças. |
Data corrente: |
16/10/2009 |
Data da última atualização: |
27/03/2019 |
Tipo da produção científica: |
Folder/Folheto/Cartilha |
Autoria: |
SANTOS, F. F. dos; MATOS, M. J. L. F.; TAVARES, S. A.; MELO, M. F. de; LANA, M. M. |
Afiliação: |
FAUSTO FRANCISCO DOS SANTOS, CNPH; MARIA JOSÉ L. F. MATOS, EMATER-DF; SELMA APARECIDA TAVARES, EMATER-DF; MÁRIO FELIPE DE MELO, EMATER-DF; MILZA MOREIRA LANA, CNPH. |
Título: |
Mandioquinha salsa: sabor único e delicado. |
Edição: |
[2 ed.] |
Ano de publicação: |
2009 |
Fonte/Imprenta: |
Brasília, DF: Embrapa Hortaliças, 2009. |
Série: |
(Hortaliças. Como comprar, conservar e consumir). |
Idioma: |
Português |
Notas: |
Folder. |
Conteúdo: |
Como comprar; Como conservar; Como consumir; Dicas; Receitas. |
Palavras-Chave: |
Arracacha; Batata baroa; Conservation; Consumption; Mandioquinha-salsa; Peruvian carrot. |
Thesagro: |
Arracacia Xanthorrhiza; Comercialização; Conservação; Consumo. |
Thesaurus NAL: |
marketing. |
Categoria do assunto: |
-- |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/195076/1/digitalizar0190.pdf
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Marc: |
LEADER 00924nam a2200325 a 4500 001 1782589 005 2019-03-27 008 2009 bl uuuu u0uu1 u #d 100 1 $aSANTOS, F. F. dos 245 $aMandioquinha salsa$bsabor único e delicado. 250 $a[2 ed.] 260 $aBrasília, DF: Embrapa Hortaliças$c2009 490 $a(Hortaliças. Como comprar, conservar e consumir). 500 $aFolder. 520 $aComo comprar; Como conservar; Como consumir; Dicas; Receitas. 650 $amarketing 650 $aArracacia Xanthorrhiza 650 $aComercialização 650 $aConservação 650 $aConsumo 653 $aArracacha 653 $aBatata baroa 653 $aConservation 653 $aConsumption 653 $aMandioquinha-salsa 653 $aPeruvian carrot 700 1 $aMATOS, M. J. L. F. 700 1 $aTAVARES, S. A. 700 1 $aMELO, M. F. de 700 1 $aLANA, M. M.
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