contribuição de fungos micorrízicos arbusculares nativos no estabelecimento de aristida setifolia kunth em áreas degradadas do cerrado contribution of native arbuscular mycorrhizal fungi in the stablishment of aristida setifolia kunth in degraded areas in the cerrado
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1999
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Abstract
Para estudar a dinâmica de fungos micorrízicos arbusculares (MA) nativos, em solo de cerrado natural e de três áreas degradadas, foram efetuadas avaliações quantitativa e qualitativa desses fungos, nos períodos seco e chuvoso. Nessa avaliação incluíram-se parcelas experimentais, em uma das áreas degradadas, com calcário, turfa natural e torta de mamona. Em casa de vegetação conduziram-se dois experimentos para avaliar a contribuição desses fungos no estabelecimento da gramínea pioneira Aristida setifolia Kunth. No primeiro, utilizaram-se substratos das quatro áreas, esterilizados a vapor e ao natural; no segundo, foram utilizados substratos da área experimental esterilizados, com e sem aplicação de mistura de três fungos MA nativos. No campo, a densidade aparente nas áreas degradadas foi superior à do cerrado natural, e todas apresentaram alta acidez e baixa fertilidade. Os fungos MA ocorreram em todas as áreas; houve maior número de esporos e espécies no período chuvoso. Em casa de vegetação, os fungos MA nativos promoveram aumentos significativos na matéria seca da gramínea. Não houve efeitos significativos do calcário e dos insumos orgânicos no crescimento das plantas sem inoculação dos fungos MA. Entretanto, com a inoculação, ocorreu acréscimo significativo no crescimento da gramínea e diferenciação e maximização nos efeitos desses insumos.
To study the dynamics of native AM fungi, in natural cerrado soil and three degraded areas, quantitative and qualitative avaliations were done, in the dry and rainy seasons. Those avaliations included field experiment plots from a degraded area with lime, natural peat and castor bean cake. Two greenhouse experiments studied the contribution of AM fungi to the stablishment of a spontaneous grass Aristida setifolia Kunth. The first used natural and steam sterilized substrates from the four areas; the second, field plots substrates steam sterilized with and without inoculation of three native AM fungi. In the field, soil density was higher in degraded areas and both areas presented high soil acidity. The AM fungi were present in all areas with higher number of spores and species in the rainy season. In the greenhouse experiments, native AM fungi promoted a significant increase in plant shoot dry matter. In the noninoculated field plots substrates, there was no significant effect of lime and organic compounds on plant growth. However, with the inoculation, there was a significant increase in grass shoot dry matter, with a significant improvement and differentiation of the field treatments effects.
To study the dynamics of native AM fungi, in natural cerrado soil and three degraded areas, quantitative and qualitative avaliations were done, in the dry and rainy seasons. Those avaliations included field experiment plots from a degraded area with lime, natural peat and castor bean cake. Two greenhouse experiments studied the contribution of AM fungi to the stablishment of a spontaneous grass Aristida setifolia Kunth. The first used natural and steam sterilized substrates from the four areas; the second, field plots substrates steam sterilized with and without inoculation of three native AM fungi. In the field, soil density was higher in degraded areas and both areas presented high soil acidity. The AM fungi were present in all areas with higher number of spores and species in the rainy season. In the greenhouse experiments, native AM fungi promoted a significant increase in plant shoot dry matter. In the noninoculated field plots substrates, there was no significant effect of lime and organic compounds on plant growth. However, with the inoculation, there was a significant increase in grass shoot dry matter, with a significant improvement and differentiation of the field treatments effects.
| Reference Key |
martins1999pesquisacontribuio
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| Authors | ;Carlos Romero Martins;Jeanne Christine Claessen de Miranda;Leo Nobre de Miranda |
| Journal | proc - the fourth ieee workshop on software technol for future embedded and ubiquitous syst, seus 2006 andthe second int workshop on collaborative comput, integr, and assur, wccia 2006 |
| Year | 1999 |
| DOI |
10.1590/S0100-204X1999000400019
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