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Registro Completo |
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Biblioteca(s): |
Embrapa Agropecuária Oeste. |
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Data corrente: |
17/01/2002 |
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Data da última atualização: |
13/01/2011 |
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Autoria: |
KRIFT, T. van der. |
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Título: |
Effects of plant species on nitrogen mineralization in grassland ecosystems. |
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Ano de publicação: |
2000 |
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Fonte/Imprenta: |
2000. |
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Páginas: |
131 p. |
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ISBN: |
90-5808-320-9 |
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Idioma: |
Inglês |
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Notas: |
Thesis (Doutor - Wageningen Universiteit, Wageningen. |
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Conteúdo: |
In many ecosystems, the nutrient supply is an important factor that determines plant species composition. Plant species have developed different characteristics, which make them successful competitors in either nutrient-poor or more fertile environments. These plant characteristics could, in turn, have important consequences for soil fertility. The research described in this thesis set out to investigate different plant characteristics of species from habitats that differ in nitrogen availability, to assess their possible consequences for soil nitrogen mineralization. Compared to species from nutrient-poor habitats, species from fertile habitats were expected to stimulate the N mineralization because they produce larger quantities of rhizodeposits and litter, which decompose better. Overall, the results described in this thesis support this hypothesis. Plant species from high fertility habitats increased soil N mineralization more than species from low fertility habitats. Living plants of species from high fertility habitats produced more root biomass and consequently more rhizodeposits. Moreover, species from high fertility habitats had a shorter root lifespan than low fertility species. As a result, they added greater amounts of dead roots to the soil, but the decomposability of these dead roots was not related to the fertility of the habitat that they preferred. The effect of N availability on the plant characteristics studied was striking. When N supply decreased, root biomass declined, especially for the species from high fertility habitats, and as a result the rhizodeposition decreased. Moreover, for all species lower N supplies had a negativem effect on rhizodeposit and dead root decomposition. Living plants stimulated dead root decomposition but the degree of stimulation depended on the C:N ratio of the decomposing roots. Overall, the differences in stimulation or inhibition of the N mineralization as a result of different levels of soil fertility seemed to be greater in species from high fertility habitats than in species from low fertility habitats. MenosIn many ecosystems, the nutrient supply is an important factor that determines plant species composition. Plant species have developed different characteristics, which make them successful competitors in either nutrient-poor or more fertile environments. These plant characteristics could, in turn, have important consequences for soil fertility. The research described in this thesis set out to investigate different plant characteristics of species from habitats that differ in nitrogen availability, to assess their possible consequences for soil nitrogen mineralization. Compared to species from nutrient-poor habitats, species from fertile habitats were expected to stimulate the N mineralization because they produce larger quantities of rhizodeposits and litter, which decompose better. Overall, the results described in this thesis support this hypothesis. Plant species from high fertility habitats increased soil N mineralization more than species from low fertility habitats. Living plants of species from high fertility habitats produced more root biomass and consequently more rhizodeposits. Moreover, species from high fertility habitats had a shorter root lifespan than low fertility species. As a result, they added greater amounts of dead roots to the soil, but the decomposability of these dead roots was not related to the fertility of the habitat that they preferred. The effect of N availability on the plant characteristics studied was striking. When N supply decreased, root ... Mostrar Tudo |
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Palavras-Chave: |
Pasture; Plants; Species. |
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Thesagro: |
Espécie; Mineralização; Nitrogênio; Pastagem; Planta. |
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Thesaurus Nal: |
mineralization; nitrogen. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02774nam a2200265 a 4500
001 1244217
005 2011-01-13
008 2000 bl uuuu m 00u1 u #d
020 $a90-5808-320-9
100 1 $aKRIFT, T. van der.
245 $aEffects of plant species on nitrogen mineralization in grassland ecosystems.
260 $a2000.$c2000
300 $a131 p.
500 $aThesis (Doutor - Wageningen Universiteit, Wageningen.
520 $aIn many ecosystems, the nutrient supply is an important factor that determines plant species composition. Plant species have developed different characteristics, which make them successful competitors in either nutrient-poor or more fertile environments. These plant characteristics could, in turn, have important consequences for soil fertility. The research described in this thesis set out to investigate different plant characteristics of species from habitats that differ in nitrogen availability, to assess their possible consequences for soil nitrogen mineralization. Compared to species from nutrient-poor habitats, species from fertile habitats were expected to stimulate the N mineralization because they produce larger quantities of rhizodeposits and litter, which decompose better. Overall, the results described in this thesis support this hypothesis. Plant species from high fertility habitats increased soil N mineralization more than species from low fertility habitats. Living plants of species from high fertility habitats produced more root biomass and consequently more rhizodeposits. Moreover, species from high fertility habitats had a shorter root lifespan than low fertility species. As a result, they added greater amounts of dead roots to the soil, but the decomposability of these dead roots was not related to the fertility of the habitat that they preferred. The effect of N availability on the plant characteristics studied was striking. When N supply decreased, root biomass declined, especially for the species from high fertility habitats, and as a result the rhizodeposition decreased. Moreover, for all species lower N supplies had a negativem effect on rhizodeposit and dead root decomposition. Living plants stimulated dead root decomposition but the degree of stimulation depended on the C:N ratio of the decomposing roots. Overall, the differences in stimulation or inhibition of the N mineralization as a result of different levels of soil fertility seemed to be greater in species from high fertility habitats than in species from low fertility habitats.
650 $amineralization
650 $anitrogen
650 $aEspécie
650 $aMineralização
650 $aNitrogênio
650 $aPastagem
650 $aPlanta
653 $aPasture
653 $aPlants
653 $aSpecies
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Registro original: |
Embrapa Agropecuária Oeste (CPAO) |
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| Registros recuperados : 105 | |
| 4. |  | PROTAS, J. F. da S. Aspectos atuais e perspectivas da vitivinicultura brasileira. In: CONGRESSO LATINO-AMERICANO DE VITICULTURA E ENOLOGIA, 10.; CONGRESSO BRASILEIRO DE VITICULTURA E ENOLOGIA, 11.; SEMINÁRIO FRANCO-BRASILEIRO DE VITICULTURA E ENOLOGIA, 2., 2005, Bento Gonçalves. Anais... Bento Gonçalves: Embrapa Uva e Vinho, 2005. p. 105. p. 105-108. Série Documentos, 55| Tipo: Artigo em Anais de Congresso / Nota Técnica |
| Biblioteca(s): Embrapa Uva e Vinho. |
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| 6. | | PROTAS, J. F. da S. Bom para todos. In: ANUÁRIO Brasileiro da Uva e do Vinho. Santa Cruz do Sul: Gazeta, 2007. v. 4 p. 94-95. José Fernando da Silva Protas, CNPUV.| Tipo: Artigo de Divulgação na Mídia |
| Biblioteca(s): Embrapa Uva e Vinho. |
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| Registros recuperados : 105 | |
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