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Registro Completo |
Biblioteca(s): |
Embrapa Meio-Norte. |
Data corrente: |
14/04/1997 |
Data da última atualização: |
14/04/1997 |
Autoria: |
TARDIEU, F. |
Título: |
Growth and functioning of roots and of root systems subjected to soil compaction. Towards a system with multiple signalling?. |
Ano de publicação: |
1994 |
Fonte/Imprenta: |
Soil & Tillage Research, v. 30, n. 214, p. 217-243, 1994. |
Idioma: |
Inglês |
Conteúdo: |
The effect of soil mechanical impedance on root growth is discussed on several levels from the apex to the root system. At the individual root level, the balance of pressures on the root apex cannot account for observed reductions in root elongation rate. Furthermore, soil mechanical impedance affects the elongation rate of fon-impeded organs, such as leaves or non-impeded roots. A chemical message originating in roots could account for such an effect, probably via changes in cell wall rheological properties in all growing zones of the plant. Changes in carbon allocation could also have a role. At a whole-plant level, indirect effects linked to changes in the plant structure contribute in a major way to the effect of mechanical impedance on root growth. Although only a small proportion of roots o field-grown plants are in contact with compact soil, geometrical characteristics of root systems are considerably affected. In particular, root deepening is delayed and roots tend to have a clumped spatial arrangement. Experimental evidence and modelling suggest that this change in root system architecture could cause water stress, even in relatively wet soil, because of an increase in resistance to the soil-root water flux. As a consequence, root water status and water flux decrease, and stomatal conductance is reduced as a consequence of a chemical message originating in the roots. This socondary message is super-imposed onto the direct message linked to mechanical impedance. |
Palavras-Chave: |
Caompactacao; Compaction; Elongation rate; Plant growth regulator; Soil mechanical impedance; Water flux. |
Thesagro: |
Raiz; Solo. |
Thesaurus Nal: |
stomatal conductance. |
Categoria do assunto: |
-- |
Marc: |
LEADER 02173naa a2200229 a 4500 001 1054568 005 1997-04-14 008 1994 bl --- 0-- u #d 100 1 $aTARDIEU, F. 245 $aGrowth and functioning of roots and of root systems subjected to soil compaction. Towards a system with multiple signalling?. 260 $c1994 520 $aThe effect of soil mechanical impedance on root growth is discussed on several levels from the apex to the root system. At the individual root level, the balance of pressures on the root apex cannot account for observed reductions in root elongation rate. Furthermore, soil mechanical impedance affects the elongation rate of fon-impeded organs, such as leaves or non-impeded roots. A chemical message originating in roots could account for such an effect, probably via changes in cell wall rheological properties in all growing zones of the plant. Changes in carbon allocation could also have a role. At a whole-plant level, indirect effects linked to changes in the plant structure contribute in a major way to the effect of mechanical impedance on root growth. Although only a small proportion of roots o field-grown plants are in contact with compact soil, geometrical characteristics of root systems are considerably affected. In particular, root deepening is delayed and roots tend to have a clumped spatial arrangement. Experimental evidence and modelling suggest that this change in root system architecture could cause water stress, even in relatively wet soil, because of an increase in resistance to the soil-root water flux. As a consequence, root water status and water flux decrease, and stomatal conductance is reduced as a consequence of a chemical message originating in the roots. This socondary message is super-imposed onto the direct message linked to mechanical impedance. 650 $astomatal conductance 650 $aRaiz 650 $aSolo 653 $aCaompactacao 653 $aCompaction 653 $aElongation rate 653 $aPlant growth regulator 653 $aSoil mechanical impedance 653 $aWater flux 773 $tSoil & Tillage Research$gv. 30, n. 214, p. 217-243, 1994.
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Embrapa Meio-Norte (CPAMN) |
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Biblioteca(s): |
Embrapa Cerrados. |
Data corrente: |
22/03/2023 |
Data da última atualização: |
22/03/2023 |
Tipo da produção científica: |
Artigo em Anais de Congresso |
Autoria: |
ARCOVERDE, G. F. B.; BORGES, M. E. S.; MARTINS, E. de S.; RAMOS, V. M.; GUIMARÃES, R. F.; CARVALHO JUNIOR, O. A. de; GOMES, R. A. T. |
Afiliação: |
GUSTAVO FELIPE BALUÉ ARCOVERDE, UNIVERSIDADE DE BRASÍLIA; MARIA ELISABETE SILVEIRA BORGES, UNIVERSIDADE DE BRASÍLIA; EDER DE SOUZA MARTINS, CPAC; VERÔNICA MOREIRA RAMOS, UNIVERSIDADE DE BRASÍLIA; RENATO FONTES GUIMARÃES, UNIVERSIDADE DE BRASÍLIA; OSMAR ABÍLIO DE CARVALHO JÚNIOR, UNIVERSIDADE DE BRASÍLIA; ROBERTO ARNALDO TRANCOSO GOMES, UNIVERSIDADE DE BRASÍLIA. |
Título: |
Mapeamento pedológico em relevos cársticos a partir da análise morfométrica. |
Ano de publicação: |
2005 |
Fonte/Imprenta: |
In: SIMPÓSIO BRASILEIRO DE SENSORIAMENTO REMOTO, 12., 2005, Goiânia. Anais... São José dos Campos: INPE, 2005. |
Páginas: |
P. 1725-1732 |
Idioma: |
Português |
Conteúdo: |
ABSTRACT - The space has elements of physical, biotic and anthropic order that interact and impel other elements of an inferior hierarchy in a successive way which propitiate the formation of emerging properties that feed a system of higher subsequence, configuring what we visually know as landscape. This system possesses its own characteristics in accordance with each area of influence of more predominant elements, where it is possible the determination of patterns and models within a space and temporary scale. This work proposes the modeling of a landscape from geomorphologic variables (an element under geologic and hydrologic influences mainly), based on a digital model of the terrain in a region where the natural process and the anthropic one on the carbonatic rocks are expressive. Due to the drainage shape, the corrosive action on the rocks makes up the main characteristic of the carstic landscape instead of performing the erosive process. The proposed statistical method establishes relationships between morphometric parameters and pedological units. |
Palavras-Chave: |
Análise morfométrica; Mapeamento pedológico. |
Thesagro: |
Cerrado; Relevo. |
Thesaurus NAL: |
Landscapes; Morphometry; Savannas. |
Categoria do assunto: |
-- |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/doc/1152580/1/Mapeamento-pedologico-relevos-2005.pdf
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Marc: |
LEADER 01934nam a2200277 a 4500 001 2152580 005 2023-03-22 008 2005 bl uuuu u00u1 u #d 100 1 $aARCOVERDE, G. F. B. 245 $aMapeamento pedológico em relevos cársticos a partir da análise morfométrica.$h[electronic resource] 260 $aIn: SIMPÓSIO BRASILEIRO DE SENSORIAMENTO REMOTO, 12., 2005, Goiânia. Anais... São José dos Campos: INPE$c2005 300 $aP. 1725-1732 520 $aABSTRACT - The space has elements of physical, biotic and anthropic order that interact and impel other elements of an inferior hierarchy in a successive way which propitiate the formation of emerging properties that feed a system of higher subsequence, configuring what we visually know as landscape. This system possesses its own characteristics in accordance with each area of influence of more predominant elements, where it is possible the determination of patterns and models within a space and temporary scale. This work proposes the modeling of a landscape from geomorphologic variables (an element under geologic and hydrologic influences mainly), based on a digital model of the terrain in a region where the natural process and the anthropic one on the carbonatic rocks are expressive. Due to the drainage shape, the corrosive action on the rocks makes up the main characteristic of the carstic landscape instead of performing the erosive process. The proposed statistical method establishes relationships between morphometric parameters and pedological units. 650 $aLandscapes 650 $aMorphometry 650 $aSavannas 650 $aCerrado 650 $aRelevo 653 $aAnálise morfométrica 653 $aMapeamento pedológico 700 1 $aBORGES, M. E. S. 700 1 $aMARTINS, E. de S. 700 1 $aRAMOS, V. M. 700 1 $aGUIMARÃES, R. F. 700 1 $aCARVALHO JUNIOR, O. A. de 700 1 $aGOMES, R. A. T.
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