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Registro Completo |
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Biblioteca(s): |
Embrapa Agrobiologia; Embrapa Pantanal. |
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Data corrente: |
27/06/1995 |
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Data da última atualização: |
27/06/1995 |
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Autoria: |
WARDLE, D. A. |
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Título: |
Changes in the microbial biomass and metabolic quotient during leaf litter succession in some New Zealand forest and scrubland ecosystems. |
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Ano de publicação: |
1993 |
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Fonte/Imprenta: |
Funct. Ecol., v.7, n.3, p.346-355, 1993. |
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Idioma: |
Inglês |
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Conteúdo: |
1. The soil microbial biomass and microbial metabolic quotient (respiration: biomass ratio) was measured in 16 forest and scrubland ecosystems throughout New Zealand, on materials representing successional stages of plant litter and its subsequent incorporation into the F-H and mineral soil layers. 2. Microbial biomass usually peaked in the L1 layer and then declined. The microbial carbon: organic ratio decreased sharply between the F-H layer and the underlying layer, indicating that a dtree (possibly pH) reduced the proportion of organic matter immobilizewd in the microbial biomass at this stage. 3. The microbial respiration: biomass ratio declined between the L1 and F-H stages.Thsi was followed by a statistically significant (and sometimes very large) increase in this ratio upon reaching the mineral layer, for 10 of the 16 sites. This increase is in contrast to the predictions of Odum's theory of ecosystem succession and probably occurs because increasing levels of stress (in the absence of disturbance) in the latter stages of this succession reduce microbial efficiency. 4. When the 16 sites were classified acordfing to early and late-vegetation successional stages, thre was no difference between the two categories with reagrd to mnicrobial biomass, respiration or the metabolic quotient, although the microbial biomass carbon: organic carbon ratio was significantly higher for the early-successional sites. However, the variance for the microbial biomass: carbon ratio and metabolic quotient was substantially lower for the late-successional than early-successional sites, indicating that as vegetation succession proceeds these varoables both converge to a narrower range of values. Menos1. The soil microbial biomass and microbial metabolic quotient (respiration: biomass ratio) was measured in 16 forest and scrubland ecosystems throughout New Zealand, on materials representing successional stages of plant litter and its subsequent incorporation into the F-H and mineral soil layers. 2. Microbial biomass usually peaked in the L1 layer and then declined. The microbial carbon: organic ratio decreased sharply between the F-H layer and the underlying layer, indicating that a dtree (possibly pH) reduced the proportion of organic matter immobilizewd in the microbial biomass at this stage. 3. The microbial respiration: biomass ratio declined between the L1 and F-H stages.Thsi was followed by a statistically significant (and sometimes very large) increase in this ratio upon reaching the mineral layer, for 10 of the 16 sites. This increase is in contrast to the predictions of Odum's theory of ecosystem succession and probably occurs because increasing levels of stress (in the absence of disturbance) in the latter stages of this succession reduce microbial efficiency. 4. When the 16 sites were classified acordfing to early and late-vegetation successional stages, thre was no difference between the two categories with reagrd to mnicrobial biomass, respiration or the metabolic quotient, although the microbial biomass carbon: organic carbon ratio was significantly higher for the early-successional sites. However, the variance for the microbial biomass: carbon ratio and met... Mostrar Tudo |
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Palavras-Chave: |
Biomassa Microbiana; CO2 (pCO2); Decomposition; Forest; Litter. |
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Thesagro: |
Carbono; Decomposição; Ecologia; Floresta; Matéria Orgânica; Microflora; Ph; Planta; Seca. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02477naa a2200289 a 4500
001 1618403
005 1995-06-27
008 1993 bl --- 0-- u #d
100 1 $aWARDLE, D. A.
245 $aChanges in the microbial biomass and metabolic quotient during leaf litter succession in some New Zealand forest and scrubland ecosystems.
260 $c1993
520 $a1. The soil microbial biomass and microbial metabolic quotient (respiration: biomass ratio) was measured in 16 forest and scrubland ecosystems throughout New Zealand, on materials representing successional stages of plant litter and its subsequent incorporation into the F-H and mineral soil layers. 2. Microbial biomass usually peaked in the L1 layer and then declined. The microbial carbon: organic ratio decreased sharply between the F-H layer and the underlying layer, indicating that a dtree (possibly pH) reduced the proportion of organic matter immobilizewd in the microbial biomass at this stage. 3. The microbial respiration: biomass ratio declined between the L1 and F-H stages.Thsi was followed by a statistically significant (and sometimes very large) increase in this ratio upon reaching the mineral layer, for 10 of the 16 sites. This increase is in contrast to the predictions of Odum's theory of ecosystem succession and probably occurs because increasing levels of stress (in the absence of disturbance) in the latter stages of this succession reduce microbial efficiency. 4. When the 16 sites were classified acordfing to early and late-vegetation successional stages, thre was no difference between the two categories with reagrd to mnicrobial biomass, respiration or the metabolic quotient, although the microbial biomass carbon: organic carbon ratio was significantly higher for the early-successional sites. However, the variance for the microbial biomass: carbon ratio and metabolic quotient was substantially lower for the late-successional than early-successional sites, indicating that as vegetation succession proceeds these varoables both converge to a narrower range of values.
650 $aCarbono
650 $aDecomposição
650 $aEcologia
650 $aFloresta
650 $aMatéria Orgânica
650 $aMicroflora
650 $aPh
650 $aPlanta
650 $aSeca
653 $aBiomassa Microbiana
653 $aCO2 (pCO2)
653 $aDecomposition
653 $aForest
653 $aLitter
773 $tFunct. Ecol.$gv.7, n.3, p.346-355, 1993.
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Embrapa Agrobiologia (CNPAB) |
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