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Registro Completo |
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Biblioteca(s): |
Embrapa Florestas. |
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Data corrente: |
22/09/2008 |
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Data da última atualização: |
22/09/2008 |
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Autoria: |
LUBBERS, I. M.; GIANNOPOULOS, G.; RIZHIYA, E.; BERTORA, C.; BRUSSAARD, L.; GROENIGEN, J. W. van. |
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Título: |
Trade-offs between N2O emission and C-sequestration in the soil: the role of earthworms. |
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Ano de publicação: |
2008 |
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Fonte/Imprenta: |
In: INTERNATIONAL COLLOQUIUM ON SOIL ZOOLOGY, 15; INTERNATIONAL COLLOQUIUM ON APTERYGOTA, 12., 2008, Curitiba. Biodiversity, conservation and sustainabele management of soil animal: abstracts. Colombo: Embrapa Florestas. Editors: George Gardner Brown; Klaus Dieter Sautter; Renato Marques; Amarildo Pasini. 1 CD-ROM. |
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Idioma: |
Inglês |
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Conteúdo: |
The rapidly rising concentrations of the greenhouse gas carbon dioxide (CO2) in the atmosphere
has spurred the interest in soils as a potential carbon (C) sink. The sequestration of C in soils
and vegetation has therefore received much attention and an overwhelming amount of research
has recently been aimed at increasing soil organic C stocks. However, there are many reports
indicating that C-sequestration is often negated by elevated emissions of the potent greenhouse
gas nitrous oxide (N2O). This trade-off mechanism is especially relevant in agro-ecosystems,
where C-sequestration is thought to be most promising, but where conversely almost half of
anthropogenic N2O-emissions originate from.
It is not yet clear what the driving factors behind this trade-off are, nor how it can be avoided. We
suggest that earthworm activity may be partly responsible for the trade-off. Earthworm activity is
increasingly recognized as being beneficial to C-sequestration through stabilization of SOM.
We report results from two laboratory experiments indicating that earthworm activity can also
lead to strongly elevated N2O-emissions.
In a first experiment, dried grass residue (Lolium perenne) was applied at the top of a loamy
soil or mixed through the soil, and N2O-emission was followed for three months. Treatments
included presence of the epigeic earthworm Lumbricus rubellus and the anecic earthworm
Aporrectodea longa. Cumulative N2O-emissions increased significantly for both species. The
strongest effect was measured for L. rubellus, where N2O-emissions significantly increased
from 55.7 to 789.1 ìg N2O-N kg-1 soil. This effect was only observed when residue was applied
on top of the soil.
In a second experiment we determined the effect of epigeic (L. rubellus) and endogeic
(Aporrectodea caliginosa) earthworms on N2O-emissions for two different soil types (loam and
sand) in the presence of radish residue (Raphanus sativus subsp. oleiferus). Both species
showed significant increases in N2O-emissions, which differed with residue application method
and soil type. N2O-emissions were generally larger in loamy soils and the strongest effect was
measured for A. caliginosa when residue was mixed into the soil, increasing emissions from
1350.1 to 2223.2 ìg N2O-N kg-1 soil. L. rubellus only resulted in elevated N2O-emissions when
residue was applied on top.
These studies make it clear that elevated N2O-emissions due to earthworm activity is a
widespread phenomenon which is associated with all three functional earthworm groups. Also,
there are strong indications that interaction effects (both positive and negative) are taking place
between earthworm species with respect to N2O-emissions. However, many aspects remain to
be determined before we will fully understand the relation between earthworm activity and N2Oemissions.
Our future research will focus on: i) quantifying to what extent the earthworm effect is
present in functioning (grassland) agro-ecosytems; ii) distinguishing between a ?species effect?
and an ?earthworm density effect?; iii) characterizing interactions between functional groups; iv)
identifying the exact mechanism through which earthworms increase N2O-emissions, and v) to
relate increased N2O-emissions to increased C stabilization through earthworms. Ultimately,
our research should make the link between biodiversity (of earthworms) and ecosystem functioning
(the soil greenhouse gas balance). MenosThe rapidly rising concentrations of the greenhouse gas carbon dioxide (CO2) in the atmosphere
has spurred the interest in soils as a potential carbon (C) sink. The sequestration of C in soils
and vegetation has therefore received much attention and an overwhelming amount of research
has recently been aimed at increasing soil organic C stocks. However, there are many reports
indicating that C-sequestration is often negated by elevated emissions of the potent greenhouse
gas nitrous oxide (N2O). This trade-off mechanism is especially relevant in agro-ecosystems,
where C-sequestration is thought to be most promising, but where conversely almost half of
anthropogenic N2O-emissions originate from.
It is not yet clear what the driving factors behind this trade-off are, nor how it can be avoided. We
suggest that earthworm activity may be partly responsible for the trade-off. Earthworm activity is
increasingly recognized as being beneficial to C-sequestration through stabilization of SOM.
We report results from two laboratory experiments indicating that earthworm activity can also
lead to strongly elevated N2O-emissions.
In a first experiment, dried grass residue (Lolium perenne) was applied at the top of a loamy
soil or mixed through the soil, and N2O-emission was followed for three months. Treatments
included presence of the epigeic earthworm Lumbricus rubellus and the anecic earthworm
Aporrectodea longa. Cumulative N2O-emissions increased significantly for both species. The
stron... Mostrar Tudo |
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Categoria do assunto: |
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Marc: |
LEADER 04229naa a2200181 a 4500
001 1314895
005 2008-09-22
008 2008 bl uuuu u00u1 u #d
100 1 $aLUBBERS, I. M.
245 $aTrade-offs between N2O emission and C-sequestration in the soil$bthe role of earthworms.
260 $c2008
520 $aThe rapidly rising concentrations of the greenhouse gas carbon dioxide (CO2) in the atmosphere has spurred the interest in soils as a potential carbon (C) sink. The sequestration of C in soils and vegetation has therefore received much attention and an overwhelming amount of research has recently been aimed at increasing soil organic C stocks. However, there are many reports indicating that C-sequestration is often negated by elevated emissions of the potent greenhouse gas nitrous oxide (N2O). This trade-off mechanism is especially relevant in agro-ecosystems, where C-sequestration is thought to be most promising, but where conversely almost half of anthropogenic N2O-emissions originate from. It is not yet clear what the driving factors behind this trade-off are, nor how it can be avoided. We suggest that earthworm activity may be partly responsible for the trade-off. Earthworm activity is increasingly recognized as being beneficial to C-sequestration through stabilization of SOM. We report results from two laboratory experiments indicating that earthworm activity can also lead to strongly elevated N2O-emissions. In a first experiment, dried grass residue (Lolium perenne) was applied at the top of a loamy soil or mixed through the soil, and N2O-emission was followed for three months. Treatments included presence of the epigeic earthworm Lumbricus rubellus and the anecic earthworm Aporrectodea longa. Cumulative N2O-emissions increased significantly for both species. The strongest effect was measured for L. rubellus, where N2O-emissions significantly increased from 55.7 to 789.1 ìg N2O-N kg-1 soil. This effect was only observed when residue was applied on top of the soil. In a second experiment we determined the effect of epigeic (L. rubellus) and endogeic (Aporrectodea caliginosa) earthworms on N2O-emissions for two different soil types (loam and sand) in the presence of radish residue (Raphanus sativus subsp. oleiferus). Both species showed significant increases in N2O-emissions, which differed with residue application method and soil type. N2O-emissions were generally larger in loamy soils and the strongest effect was measured for A. caliginosa when residue was mixed into the soil, increasing emissions from 1350.1 to 2223.2 ìg N2O-N kg-1 soil. L. rubellus only resulted in elevated N2O-emissions when residue was applied on top. These studies make it clear that elevated N2O-emissions due to earthworm activity is a widespread phenomenon which is associated with all three functional earthworm groups. Also, there are strong indications that interaction effects (both positive and negative) are taking place between earthworm species with respect to N2O-emissions. However, many aspects remain to be determined before we will fully understand the relation between earthworm activity and N2Oemissions. Our future research will focus on: i) quantifying to what extent the earthworm effect is present in functioning (grassland) agro-ecosytems; ii) distinguishing between a ?species effect? and an ?earthworm density effect?; iii) characterizing interactions between functional groups; iv) identifying the exact mechanism through which earthworms increase N2O-emissions, and v) to relate increased N2O-emissions to increased C stabilization through earthworms. Ultimately, our research should make the link between biodiversity (of earthworms) and ecosystem functioning (the soil greenhouse gas balance).
700 1 $aGIANNOPOULOS, G.
700 1 $aRIZHIYA, E.
700 1 $aBERTORA, C.
700 1 $aBRUSSAARD, L.
700 1 $aGROENIGEN, J. W. van.
773 $tIn: INTERNATIONAL COLLOQUIUM ON SOIL ZOOLOGY, 15; INTERNATIONAL COLLOQUIUM ON APTERYGOTA, 12., 2008, Curitiba. Biodiversity, conservation and sustainabele management of soil animal: abstracts. Colombo: Embrapa Florestas. Editors: George Gardner Brown; Klaus Dieter Sautter; Renato Marques; Amarildo Pasini. 1 CD-ROM.
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Registro original: |
Embrapa Florestas (CNPF) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Algodão. Para informações adicionais entre em contato com cnpa.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Algodão. |
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Data corrente: |
14/01/2010 |
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Data da última atualização: |
14/01/2010 |
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Tipo da produção científica: |
Resumo em Anais de Congresso |
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Autoria: |
FERNANDES, V. M. C.; MORAIS, J. P. S.; PINHEIRO, M. V. M.; CARVALHO, A. C. P. P. de; BARROS, L. de M.; ARAGÃO, F. A. S. de. |
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Afiliação: |
Vanessa Moreira Câmara Fernandes, UFC;; João Paulo Saraiva Morais, CNPA;; Marcos Vinícios Marques Pinheiro, UFV;; Ana Cristina Portugal Pinto Carvalho, CNPAT;; Levi de Moura Barros, CNPAT;; Fenando Antônio Sousa Aragão, CNPAT.; JOÃO PAULO SARAIVA MORAIS. |
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Título: |
Efeito de diferentes auxinas na indução de calos embriogênicos em três cultivares de antúrio. |
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Ano de publicação: |
2009 |
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Fonte/Imprenta: |
In: CONGRESSO BRASILEIRO DE CULTURA DE TECIDOS DE PLANTAS, 4., 2009, Aracaju. Resumos... Aracaju: Embrapa Tabuleiros Costeiros, 2009. |
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Descrição Física: |
1 CD-ROM. |
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ISSN: |
1678-1953 |
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Idioma: |
Português |
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Palavras-Chave: |
Propagação in vitro; Segmento nodais. |
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Thesagro: |
Anthurium Andraeanum. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 00782naa a2200229 a 4500
001 1580569
005 2010-01-14
008 2009 bl uuuu u00u1 u #d
022 $a1678-1953
100 1 $aFERNANDES, V. M. C.
245 $aEfeito de diferentes auxinas na indução de calos embriogênicos em três cultivares de antúrio.
260 $c2009
300 $c1 CD-ROM.
650 $aAnthurium Andraeanum
653 $aPropagação in vitro
653 $aSegmento nodais
700 1 $aMORAIS, J. P. S.
700 1 $aPINHEIRO, M. V. M.
700 1 $aCARVALHO, A. C. P. P. de
700 1 $aBARROS, L. de M.
700 1 $aARAGÃO, F. A. S. de
773 $tIn: CONGRESSO BRASILEIRO DE CULTURA DE TECIDOS DE PLANTAS, 4., 2009, Aracaju. Resumos... Aracaju: Embrapa Tabuleiros Costeiros, 2009.
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