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 | Acesso ao texto completo restrito à biblioteca da Embrapa Caprinos e Ovinos. Para informações adicionais entre em contato com cnpc.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
01/08/1992 |
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Data da última atualização: |
20/07/2023 |
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Autoria: |
HUNT, H. W. |
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Título: |
A simulations model for decomposition in grasslands. |
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Ano de publicação: |
1977 |
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Fonte/Imprenta: |
Ecology, v. 58, n. 3, p.469-484, 1977. |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: A model has been developed to simulate the dynamics of decomposers and substrates in grasslands. Substrates represented are humic material, feces, and dead plant and animal remains. Except for humic material, substrates are further divided into a rapidly and a slowly decomposing fraction. The proportion of rapidly decomposing material in a substrate is predicted from its initial nitrogen content. The belowground portion of the system is divided into layers because temperature and soil water, the most important driving variables for the model, vary with depth. Decomposition rates are predicted from temperature, water tension, and inorganic nitrogen concentration. Taxonomic groups of decomposers are not distinguished, but a distinction is made between active and inactive states, which differ in respiration rate, in death rate, and in that only active decomposers assimilate substrate. The model's predictions compare favorably to data on C02 evolution and to litter bag experiments, but not to ATP estimates of active microbial biomass. The model indicates a profound influence of depth on decomposition rates and on decomposer biomass dynamics, growth yield, and secondary productivity. |
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Palavras-Chave: |
C02 evolution; Decomposers; Litter bags; Metabolic requirementS; Restolho. |
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Thesagro: |
Decomposição; Pastagem. |
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Thesaurus Nal: |
Grassland soils; Population dynamics; Simulation models. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
LEADER 01850naa a2200241 a 4500
001 1521066
005 2023-07-20
008 1977 bl uuuu u00u1 u #d
100 1 $aHUNT, H. W.
245 $aA simulations model for decomposition in grasslands.$h[electronic resource]
260 $c1977
520 $aAbstract: A model has been developed to simulate the dynamics of decomposers and substrates in grasslands. Substrates represented are humic material, feces, and dead plant and animal remains. Except for humic material, substrates are further divided into a rapidly and a slowly decomposing fraction. The proportion of rapidly decomposing material in a substrate is predicted from its initial nitrogen content. The belowground portion of the system is divided into layers because temperature and soil water, the most important driving variables for the model, vary with depth. Decomposition rates are predicted from temperature, water tension, and inorganic nitrogen concentration. Taxonomic groups of decomposers are not distinguished, but a distinction is made between active and inactive states, which differ in respiration rate, in death rate, and in that only active decomposers assimilate substrate. The model's predictions compare favorably to data on C02 evolution and to litter bag experiments, but not to ATP estimates of active microbial biomass. The model indicates a profound influence of depth on decomposition rates and on decomposer biomass dynamics, growth yield, and secondary productivity.
650 $aGrassland soils
650 $aPopulation dynamics
650 $aSimulation models
650 $aDecomposição
650 $aPastagem
653 $aC02 evolution
653 $aDecomposers
653 $aLitter bags
653 $aMetabolic requirementS
653 $aRestolho
773 $tEcology$gv. 58, n. 3, p.469-484, 1977.
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