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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
01/10/1997 |
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Data da última atualização: |
05/04/2017 |
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Autoria: |
HOLLAND, E. A.; PARTON, W. J.; DETLING, J. K.; COPPOCK, D. L. |
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Título: |
Physiological responses of plant populations to herbivory and their consequences for ecosystem nutrient flow. |
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Ano de publicação: |
1992 |
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Fonte/Imprenta: |
American Naturalist, v.140, n.4, p.685-706, Oct. 1992. |
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Idioma: |
Inglês |
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Conteúdo: |
We explored how responses of two populations variable in grazing tolerance provide feedbacks to nutrient supply by controlling carbon supply to soil heterotrophs. The study focused on differences in production and carbon and nitrogen allocation patterns between the two population. The grazing-tolerant population, or non-colony population, is found on intensively grazed prairie dog colonies, and a grazing-intolerant population, the off-colony population, is found in uncolonized grasslands. Equations describing the production and allocation responses to defoliation for the two ecotypes described were incorporated into CENTURY, a nutrient cycling simulation model. Simulations showed an increase in plant production that paralleled increases in net nitrogen mineralization. Production was greather with grazing and was maintened at higher grazing intensities for the on-colony than the off-colony population. Differences between the populations provide important controls over nitrogen losses. Feedback between plant responses to grazing and nitrogen cycling accounted for increased nitrogen availability with grazing. These feedbacks were more important determinants of ecosystem function than were fertilization effects of urine and feces deposition. The simulation results suggest that ecosystem function may be sensitive to physiological differences in population responses to periodic disturbances like herbivory. |
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Palavras-Chave: |
Ecosystem; Fluxo de nutrient; Herbivoro; Herbivory; Nutrient flow; Plant populations. |
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Thesagro: |
Ecossistema; Planta; População. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02158naa a2200265 a 4500
001 1791848
005 2017-04-05
008 1992 bl --- 0-- u #d
100 1 $aHOLLAND, E. A.
245 $aPhysiological responses of plant populations to herbivory and their consequences for ecosystem nutrient flow.
260 $c1992
520 $aWe explored how responses of two populations variable in grazing tolerance provide feedbacks to nutrient supply by controlling carbon supply to soil heterotrophs. The study focused on differences in production and carbon and nitrogen allocation patterns between the two population. The grazing-tolerant population, or non-colony population, is found on intensively grazed prairie dog colonies, and a grazing-intolerant population, the off-colony population, is found in uncolonized grasslands. Equations describing the production and allocation responses to defoliation for the two ecotypes described were incorporated into CENTURY, a nutrient cycling simulation model. Simulations showed an increase in plant production that paralleled increases in net nitrogen mineralization. Production was greather with grazing and was maintened at higher grazing intensities for the on-colony than the off-colony population. Differences between the populations provide important controls over nitrogen losses. Feedback between plant responses to grazing and nitrogen cycling accounted for increased nitrogen availability with grazing. These feedbacks were more important determinants of ecosystem function than were fertilization effects of urine and feces deposition. The simulation results suggest that ecosystem function may be sensitive to physiological differences in population responses to periodic disturbances like herbivory.
650 $aEcossistema
650 $aPlanta
650 $aPopulação
653 $aEcosystem
653 $aFluxo de nutrient
653 $aHerbivoro
653 $aHerbivory
653 $aNutrient flow
653 $aPlant populations
700 1 $aPARTON, W. J.
700 1 $aDETLING, J. K.
700 1 $aCOPPOCK, D. L.
773 $tAmerican Naturalist$gv.140, n.4, p.685-706, Oct. 1992.
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Registro original: |
Embrapa Pantanal (CPAP) |
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