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Registro Completo |
Biblioteca(s): |
Embrapa Meio Ambiente. |
Data corrente: |
24/02/2016 |
Data da última atualização: |
16/10/2020 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Autoria: |
EPRON, D.; CABRAL, O. M. R.; LACLAU, J.-P.; DANNOURA, M.; PACKER, A. P.; PLAIN, C.; BATTIE-LACLAU, P.; MOREIRA, M. Z.; TRIVELIN, P. C. O.; BOUILLET, J-P.; GÉRANT, D.; NOUVELLON, Y. |
Afiliação: |
DANIEL EPRON, Université de Lorraine; OSVALDO MACHADO RODRIGUES CABRAL, CNPMA; JEAN-PAUL LACLAU, CIRAD; MASAKO DANNOURA, Kyoto University; ANA PAULA CONTADOR PACKER, CNPMA; CAROLINE PLAIN, INRA; PATRICIA BATTIE-LACLAU, CENA-USP; MARCELO ZACHARIAS MOREIRA, CENA-USP; PAULO CESAR OCHEUZE TRIVELIN, CENA-USP; JEAN-PIERRE BOUILLET, ESALQ-USP; DOMINIQUE GERANT, Université de Lorraine; YANN NOUVELLON, IAG-USP. |
Título: |
In situ 13CO2 pulse labelling of field-grown eucalypt trees revealed the effects of potassium nutrition and throughfall exclusion on phloem transport of photosynthetic carbon. |
Ano de publicação: |
2016 |
Fonte/Imprenta: |
Tree Physiology, Oxford, v. 36, n. 1, p. 6-21, 2016. |
Idioma: |
Inglês |
Conteúdo: |
Abstract: Potassium (K) is an important limiting factor of tree growth, but little is known of the effects of K supply on the long-distance transport of photosynthetic carbon (C) in the phloem and of the interaction between K fertilization and drought. We pulselabelled 2-year-old Eucalyptus grandis L. trees grown in a field trial combining K fertilization (+K and -K) and throughfall exclusion (+W and -W), and we estimated the velocity of C transfer by comparing time lags between the uptake of 13CO2 and its recovery in trunk CO2 efflux recorded at different heights. We also analysed the dynamics of the labelled photosynthates recovered in the foliage and in the phloem sap (inner bark extract). The mean residence time of labelled C in the foliage was short (21?31 h). The time series of 13C in excess in the foliage was affected by the level of fertilization, whereas the effect of throughfall exclusion was not significant. The velocity of C transfer in the trunk (0.20?0.82 m h-1) was twice as high in +K trees than in -K trees, with no significant effect of throughfall exclusion except for one +K -W tree labelled in the middle of the drought season that was exposed to a more pronounced water stress (midday leaf water potential of -2.2 MPa). Our results suggest that besides reductions in photosynthetic C supply and in C demand by sink organs, the lower velocity under K deficiency is due to a lower cross-sectional area of the sieve tubes, whereas an increase in phloem sap viscosity is more likely limiting phloem transport under drought. In all treatments, 10 times less 13C was recovered in inner bark extracts at the bottom of the trunk when compared with the base of the crown, suggesting that a large part of the labelled assimilates has been exported out of the phloem and replaced by unlabelled C. This supports the ?leakage-retrieval mechanism? that may play a role in maintaining the pressure gradient between source and sink organs required to sustain high velocity of phloem transport in tall trees. MenosAbstract: Potassium (K) is an important limiting factor of tree growth, but little is known of the effects of K supply on the long-distance transport of photosynthetic carbon (C) in the phloem and of the interaction between K fertilization and drought. We pulselabelled 2-year-old Eucalyptus grandis L. trees grown in a field trial combining K fertilization (+K and -K) and throughfall exclusion (+W and -W), and we estimated the velocity of C transfer by comparing time lags between the uptake of 13CO2 and its recovery in trunk CO2 efflux recorded at different heights. We also analysed the dynamics of the labelled photosynthates recovered in the foliage and in the phloem sap (inner bark extract). The mean residence time of labelled C in the foliage was short (21?31 h). The time series of 13C in excess in the foliage was affected by the level of fertilization, whereas the effect of throughfall exclusion was not significant. The velocity of C transfer in the trunk (0.20?0.82 m h-1) was twice as high in +K trees than in -K trees, with no significant effect of throughfall exclusion except for one +K -W tree labelled in the middle of the drought season that was exposed to a more pronounced water stress (midday leaf water potential of -2.2 MPa). Our results suggest that besides reductions in photosynthetic C supply and in C demand by sink organs, the lower velocity under K deficiency is due to a lower cross-sectional area of the sieve tubes, whereas an increase in phloem sap viscosity... Mostrar Tudo |
Palavras-Chave: |
Carbon isotope; Carbon transfer; v. |
Thesagro: |
Carbono; Eucalipto; Eucalyptus Grandis; Fertilizante potássico; Seca. |
Thesaurus Nal: |
Eucalyptus; Potassium fertilizers. |
Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
Marc: |
LEADER 03126naa a2200373 a 4500 001 2038387 005 2020-10-16 008 2016 bl uuuu u00u1 u #d 100 1 $aEPRON, D. 245 $aIn situ 13CO2 pulse labelling of field-grown eucalypt trees revealed the effects of potassium nutrition and throughfall exclusion on phloem transport of photosynthetic carbon.$h[electronic resource] 260 $c2016 520 $aAbstract: Potassium (K) is an important limiting factor of tree growth, but little is known of the effects of K supply on the long-distance transport of photosynthetic carbon (C) in the phloem and of the interaction between K fertilization and drought. We pulselabelled 2-year-old Eucalyptus grandis L. trees grown in a field trial combining K fertilization (+K and -K) and throughfall exclusion (+W and -W), and we estimated the velocity of C transfer by comparing time lags between the uptake of 13CO2 and its recovery in trunk CO2 efflux recorded at different heights. We also analysed the dynamics of the labelled photosynthates recovered in the foliage and in the phloem sap (inner bark extract). The mean residence time of labelled C in the foliage was short (21?31 h). The time series of 13C in excess in the foliage was affected by the level of fertilization, whereas the effect of throughfall exclusion was not significant. The velocity of C transfer in the trunk (0.20?0.82 m h-1) was twice as high in +K trees than in -K trees, with no significant effect of throughfall exclusion except for one +K -W tree labelled in the middle of the drought season that was exposed to a more pronounced water stress (midday leaf water potential of -2.2 MPa). Our results suggest that besides reductions in photosynthetic C supply and in C demand by sink organs, the lower velocity under K deficiency is due to a lower cross-sectional area of the sieve tubes, whereas an increase in phloem sap viscosity is more likely limiting phloem transport under drought. In all treatments, 10 times less 13C was recovered in inner bark extracts at the bottom of the trunk when compared with the base of the crown, suggesting that a large part of the labelled assimilates has been exported out of the phloem and replaced by unlabelled C. This supports the ?leakage-retrieval mechanism? that may play a role in maintaining the pressure gradient between source and sink organs required to sustain high velocity of phloem transport in tall trees. 650 $aEucalyptus 650 $aPotassium fertilizers 650 $aCarbono 650 $aEucalipto 650 $aEucalyptus Grandis 650 $aFertilizante potássico 650 $aSeca 653 $aCarbon isotope 653 $aCarbon transfer 653 $av 700 1 $aCABRAL, O. M. R. 700 1 $aLACLAU, J.-P. 700 1 $aDANNOURA, M. 700 1 $aPACKER, A. P. 700 1 $aPLAIN, C. 700 1 $aBATTIE-LACLAU, P. 700 1 $aMOREIRA, M. Z. 700 1 $aTRIVELIN, P. C. O. 700 1 $aBOUILLET, J-P. 700 1 $aGÉRANT, D. 700 1 $aNOUVELLON, Y. 773 $tTree Physiology, Oxford$gv. 36, n. 1, p. 6-21, 2016.
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Embrapa Meio Ambiente (CNPMA) |
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Biblioteca(s): |
Embrapa Amazônia Ocidental. |
Data corrente: |
06/10/1999 |
Data da última atualização: |
28/12/2018 |
Tipo da produção científica: |
Artigo em Anais de Congresso |
Autoria: |
BECK, L.; GASPAROTTO, L.; FORSTER, B.; FRANKLIN, E.; GARCIA, M.; HARADA, A.; HOFER, H.; LUIZAO, F.; LUIZAO, R.; MARTIUS, C.; MORAIS, J. W. de; ROMBKE, J. |
Afiliação: |
LUADIR GASPAROTTO, CPAA; MARCOS VINICIUS BASTOS GARCIA, CPAA. |
Título: |
The role of soil fauna in litter decomposition in primary forests, secondary forests and a polyculture plantation in Amazonia - methodological considerations. |
Ano de publicação: |
1998 |
Fonte/Imprenta: |
In: SHIFT - WORKSHOP, 3., 1998, Manaus. Proceedings... Bonn: BMBF, 1998. |
Páginas: |
p. 471-481. |
Idioma: |
Inglês |
Conteúdo: |
A comparative study of litter quantity and quality, decomposition rates, and the abundance, biomass, and respiration of soil-inhabiting microbes, arthropods and oligochaetes in a polyculture forestry plantation and in plots of nearby secondary and primary forests. The aim is to evaluate the specific contribution of the soil microflora and of the different function soil fauna groups to the decompostion of organic matter and the resulting nutrient supply to the plants. Several methods for the study of the soil fauna and microflora have been adapted to neotropical conditions on the base of preliminary tests. |
Palavras-Chave: |
Agrofloresta; Amazonas; Brasil; Litter forest; Manaus. |
Thesagro: |
Biomassa; Cultivo Multiplo; Fauna Edáfica; Floresta Tropical Úmida; Serapilheira. |
Thesaurus NAL: |
agroforestry; biomass; multiple cropping; soil fauna; tropical rain forests. |
Categoria do assunto: |
-- |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/113770/1/Shift471.pdf
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Marc: |
LEADER 01818nam a2200433 a 4500 001 1668408 005 2018-12-28 008 1998 bl uuuu u00u1 u #d 100 1 $aBECK, L. 245 $aThe role of soil fauna in litter decomposition in primary forests, secondary forests and a polyculture plantation in Amazonia - methodological considerations. 260 $aIn: SHIFT - WORKSHOP, 3., 1998, Manaus. Proceedings... Bonn: BMBF$c1998 300 $ap. 471-481. 520 $aA comparative study of litter quantity and quality, decomposition rates, and the abundance, biomass, and respiration of soil-inhabiting microbes, arthropods and oligochaetes in a polyculture forestry plantation and in plots of nearby secondary and primary forests. The aim is to evaluate the specific contribution of the soil microflora and of the different function soil fauna groups to the decompostion of organic matter and the resulting nutrient supply to the plants. Several methods for the study of the soil fauna and microflora have been adapted to neotropical conditions on the base of preliminary tests. 650 $aagroforestry 650 $abiomass 650 $amultiple cropping 650 $asoil fauna 650 $atropical rain forests 650 $aBiomassa 650 $aCultivo Multiplo 650 $aFauna Edáfica 650 $aFloresta Tropical Úmida 650 $aSerapilheira 653 $aAgrofloresta 653 $aAmazonas 653 $aBrasil 653 $aLitter forest 653 $aManaus 700 1 $aGASPAROTTO, L. 700 1 $aFORSTER, B. 700 1 $aFRANKLIN, E. 700 1 $aGARCIA, M. 700 1 $aHARADA, A. 700 1 $aHOFER, H. 700 1 $aLUIZAO, F. 700 1 $aLUIZAO, R. 700 1 $aMARTIUS, C. 700 1 $aMORAIS, J. W. de 700 1 $aROMBKE, J.
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