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Registro Completo |
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Biblioteca(s): |
Embrapa Clima Temperado; Embrapa Unidades Centrais. |
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Data corrente: |
28/12/2009 |
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Data da última atualização: |
22/05/2019 |
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Tipo da produção científica: |
Documentos |
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Autoria: |
AZAMBUJA, I. H. V.; MAGALHAES JUNIOR, A. M. de; FAGUNDES, P. R. R.; FRANCO, D. F. |
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Afiliação: |
ISABEL HELENA VERNETTI AZAMBUJA, CPACT; ARIANO MARTINS DE MAGALHAES JUNIOR, CPACT; PAULO RICARDO REIS FAGUNDES, CPACT; DANIEL FERNANDEZ FRANCO, CPACT. |
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Título: |
Avaliação dos impactos ambientais e econômicos da cultivar de arroz irrigado BRS Querência. |
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Ano de publicação: |
2009 |
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Fonte/Imprenta: |
Pelotas: Embrapa Clima Temperado, 2009. |
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Páginas: |
25 p. |
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Série: |
(Embrapa Clima Temperado. Documentos, 260). |
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ISSN: |
1806-9193 |
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Idioma: |
Português |
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Palavras-Chave: |
Indicador ambientalL; Indicador Arroz irrigado. |
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Thesagro: |
Agronegócio; Arroz Irrigado; Indicador Econômico; Indicador Social. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/CPACT-2010/12346/1/documento-260.pdf
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Marc: |
LEADER 00748nam a2200241 a 4500
001 1747022
005 2019-05-22
008 2009 bl uuuu u0uu1 u #d
022 $a1806-9193
100 1 $aAZAMBUJA, I. H. V.
245 $aAvaliação dos impactos ambientais e econômicos da cultivar de arroz irrigado BRS Querência.
260 $aPelotas: Embrapa Clima Temperado$c2009
300 $a25 p.
490 $a(Embrapa Clima Temperado. Documentos, 260).
650 $aAgronegócio
650 $aArroz Irrigado
650 $aIndicador Econômico
650 $aIndicador Social
653 $aIndicador ambientalL
653 $aIndicador Arroz irrigado
700 1 $aMAGALHAES JUNIOR, A. M. de
700 1 $aFAGUNDES, P. R. R.
700 1 $aFRANCO, D. F.
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Embrapa Clima Temperado (CPACT) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Florestas. Para informações adicionais entre em contato com cnpf.biblioteca@embrapa.br. |
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: |
HEDDE, M.; BUREAU, F.; CECILLON, L.; DECAENS, T. |
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Título: |
Effects of five earthworm species on soil structure and organic matter in LUVISOLs. |
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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: |
Earthworms are frequently cited as key stone soil organisms, however, their effects on soil
structure stability and organic matter (OM) in macro-aggregates are mainly driven by soil type
and land use. Loamy soils of the Bassin Parisien are mainly dedicated to intensive crop which
have led to soil degradation. Introduction of pastures is one of the most promising practices that
may restore them. The aim of this work is to quantify and compare, in laboratory experiments,
the effects of 5 earthworm species on soil OM. We hypothesize that direction and magnitude of
earthworm effects depend on (i) earthworm species and (ii) OM of the substrate hosting it.
Five earthworm species were retained for the experiment (Aporrectodea caliginosa,
Aporrectodea rosea, Allolobophora chlorotica, Aporrectodea icterica and Aporrectodea longa).
The superficial soil of 3 stands were sampled in May 2006: a 30 yrs intensive crop stand (CS);
a 5 yrs pasture (YP); a 46 yrs permanent pasture (PP). Soil (150 g of 2mm-sieved) was added
to microcosms and moistened at field capacity at the onset of the experiment. Three replicates
were set up for each treatment (species x substrate) and stored for 3 weeks in climate chambers.
C-CO2 release during the experiment was estimated by the conductivity method (Heemsbergen
et al., 2004). At the end of the experiment, soil was air-dried and dry-sieved at 2 mm to isolate
and weight the large macro-aggregate fraction (> 2mm, LMA). LMA were characterized by (i)
their organic matter content (loss-in-ignition at 550 °C); (ii) their stability estimated by the more
desegregating test of Le Bissonnais? (1996) method and expressed as the mean weight diameter
(MWD) and (iii) their organic composition assessed by Near Infrared Spectroscopy (NIRS, Antaris
II Thermo electron).
The C-CO2 release may result from quality or localisation of soil OM. The high C-CO2 release
observed in CS-microcosms hosting earthworm can be explained by the mineralization of a
labile OM pool. This hypothesis was confirmed by the decrease of OM content in LMA. On the
other hand, in pasture soils, the lack of C-CO2 release increase in earthworm presence may be
due to a physical or chemical protection of OM.
Globally the rate of LMA production decreased with soil OM content increase. On low OM content
soil, earthworms should ingest a larger amount of soil than on high OM content soil to cover the
energetic needs.
Aggregate structural stability produced in earthworms hosting microcosms was lower (CS soil),
similar (YP soil) and higher (PP soil) than in animal-free controls. Although the factor ?species?
mattered, short-term stabilisation mechanisms in those loamy soils were firstly linked to the
initial soil OM content.
Interpretation of NIRS spectra showed that the regular disturbance regime YP was submitted to
might have maintained OM biochemical composition similar to CS one and that the composition
of soil OM influence the capacities of earthworms to modify this OM composition.
Biodiversity, Conservation and
Sustainable Management of Soil Animals
August 25 - 29, 2008
Positivo University
Curitiba - Paraná - Brazil
We demonstrated that earthworm short-term effects depend on both earthworm species and
initial soil OM. These effects are complex and appear mainly in the more contrasted soils.
Conversely, in the 5-years old pasture soil, earthworm presence has very few effects. MenosEarthworms are frequently cited as key stone soil organisms, however, their effects on soil
structure stability and organic matter (OM) in macro-aggregates are mainly driven by soil type
and land use. Loamy soils of the Bassin Parisien are mainly dedicated to intensive crop which
have led to soil degradation. Introduction of pastures is one of the most promising practices that
may restore them. The aim of this work is to quantify and compare, in laboratory experiments,
the effects of 5 earthworm species on soil OM. We hypothesize that direction and magnitude of
earthworm effects depend on (i) earthworm species and (ii) OM of the substrate hosting it.
Five earthworm species were retained for the experiment (Aporrectodea caliginosa,
Aporrectodea rosea, Allolobophora chlorotica, Aporrectodea icterica and Aporrectodea longa).
The superficial soil of 3 stands were sampled in May 2006: a 30 yrs intensive crop stand (CS);
a 5 yrs pasture (YP); a 46 yrs permanent pasture (PP). Soil (150 g of 2mm-sieved) was added
to microcosms and moistened at field capacity at the onset of the experiment. Three replicates
were set up for each treatment (species x substrate) and stored for 3 weeks in climate chambers.
C-CO2 release during the experiment was estimated by the conductivity method (Heemsbergen
et al., 2004). At the end of the experiment, soil was air-dried and dry-sieved at 2 mm to isolate
and weight the large macro-aggregate fraction (> 2mm, LMA). LMA were characterized by (i)
their or... Mostrar Tudo |
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Categoria do assunto: |
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Marc: |
LEADER 04113naa a2200157 a 4500
001 1314907
005 2008-09-22
008 2008 bl uuuu u00u1 u #d
100 1 $aHEDDE, M.
245 $aEffects of five earthworm species on soil structure and organic matter in LUVISOLs.
260 $c2008
520 $aEarthworms are frequently cited as key stone soil organisms, however, their effects on soil structure stability and organic matter (OM) in macro-aggregates are mainly driven by soil type and land use. Loamy soils of the Bassin Parisien are mainly dedicated to intensive crop which have led to soil degradation. Introduction of pastures is one of the most promising practices that may restore them. The aim of this work is to quantify and compare, in laboratory experiments, the effects of 5 earthworm species on soil OM. We hypothesize that direction and magnitude of earthworm effects depend on (i) earthworm species and (ii) OM of the substrate hosting it. Five earthworm species were retained for the experiment (Aporrectodea caliginosa, Aporrectodea rosea, Allolobophora chlorotica, Aporrectodea icterica and Aporrectodea longa). The superficial soil of 3 stands were sampled in May 2006: a 30 yrs intensive crop stand (CS); a 5 yrs pasture (YP); a 46 yrs permanent pasture (PP). Soil (150 g of 2mm-sieved) was added to microcosms and moistened at field capacity at the onset of the experiment. Three replicates were set up for each treatment (species x substrate) and stored for 3 weeks in climate chambers. C-CO2 release during the experiment was estimated by the conductivity method (Heemsbergen et al., 2004). At the end of the experiment, soil was air-dried and dry-sieved at 2 mm to isolate and weight the large macro-aggregate fraction (> 2mm, LMA). LMA were characterized by (i) their organic matter content (loss-in-ignition at 550 °C); (ii) their stability estimated by the more desegregating test of Le Bissonnais? (1996) method and expressed as the mean weight diameter (MWD) and (iii) their organic composition assessed by Near Infrared Spectroscopy (NIRS, Antaris II Thermo electron). The C-CO2 release may result from quality or localisation of soil OM. The high C-CO2 release observed in CS-microcosms hosting earthworm can be explained by the mineralization of a labile OM pool. This hypothesis was confirmed by the decrease of OM content in LMA. On the other hand, in pasture soils, the lack of C-CO2 release increase in earthworm presence may be due to a physical or chemical protection of OM. Globally the rate of LMA production decreased with soil OM content increase. On low OM content soil, earthworms should ingest a larger amount of soil than on high OM content soil to cover the energetic needs. Aggregate structural stability produced in earthworms hosting microcosms was lower (CS soil), similar (YP soil) and higher (PP soil) than in animal-free controls. Although the factor ?species? mattered, short-term stabilisation mechanisms in those loamy soils were firstly linked to the initial soil OM content. Interpretation of NIRS spectra showed that the regular disturbance regime YP was submitted to might have maintained OM biochemical composition similar to CS one and that the composition of soil OM influence the capacities of earthworms to modify this OM composition. Biodiversity, Conservation and Sustainable Management of Soil Animals August 25 - 29, 2008 Positivo University Curitiba - Paraná - Brazil We demonstrated that earthworm short-term effects depend on both earthworm species and initial soil OM. These effects are complex and appear mainly in the more contrasted soils. Conversely, in the 5-years old pasture soil, earthworm presence has very few effects.
700 1 $aBUREAU, F.
700 1 $aCECILLON, L.
700 1 $aDECAENS, T.
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.
Download
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