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| Viana,Laura Tillmann; Bustamante,Mercedes Maria da Cunha; Molina,Marirosa; Pinto,Alexandre de Siqueira; Kisselle,Keith; Zepp,Richard; Burke,Roger A. |
| The objective of this work was to evaluate the effects of fire regimes and vegetation cover on the structure and dynamics of soil microbial communities, through phospholipid fatty acid (PLFA) analysis. Comparisons were made between native areas with different woody covers ("cerrado stricto sensu" and "campo sujo"), under different fire regimes, and a 20-year-old active palisadegrass pasture in the Central Plateau of Brazil. Microbial biomass was higher in the native plots than in the pasture, and the highest monthly values were observed during the rainy season in the native plots. No significant differences were observed between fire regimes or between communities from the two native vegetation types. However, the principal component (PC) analysis... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Land use; Microbial diversity; PLFA; Savannas; Seasonality. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2011001200012 |
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| Lenza,Eddie; Pinto,José Roberto Rodrigues; Pinto,Alexandre de Siqueira; Maracahipes,Leandro; Bruziguessi,Elisa Pereira. |
| Foram determinadas a composição florística e a estrutura da vegetação arbustivo-arbórea, incluindo monocotiledôneas, em uma comunidade de cerrado rupestre, no município Alto Paraíso de Goiás, Goiás. Os objetivos desse estudo foram: 1. Comparar os aspectos florísticos e estruturais da área estudada com aqueles de outros 14 estudos com comunidades arbustivo-arbóreas, com e sem a presença de monocotiledôneas, 2. Avaliar os padrões fitogeográficos das 15 áreas comparadas. Foram amostradas 71 espécies, sendo cinco espécies de monocotiledôneas (três Velloziaceae e duas Arecaceae). Considerando as monocotiledôneas, a comunidade inventariada foi a mais densa (1.977 indivíduos ha-1) e apresentou a segunda maior área basal (11,25/ m²/ ha-1), entre as áreas... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Afloramentos rochosos; Conservação; Especialistas de habitat; Fitogeografia. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042011000300002 |
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| Ferreira,Eloisa Aparecida Belleza; Bustamante,Mercedes Maria da Cunha; Resck,Dimas Vital Siqueira; Figueiredo,Cícero Célio de; Pinto,Alexandre de Siqueira; Malaquias,Juaci Vitória. |
| ABSTRACT Changes in carbon stocks in different compartments of soil organic matter of a clayey Latossolo Vermelho Distrófico (Typic Haplustox), caused by the substitution of native savanna vegetation (cerrado sensu stricto) by agroecosystems, were assessed after 31 years of cultivation. Under native vegetation, a stock of 164.5 Mg ha-1 C was estimated in the 0.00-1.00 m layer. After 31 years of cultivation, these changes in soil C stocks were detected to a depth of 0.60 m. In the case of substitution of cerrado sensu stricto by no-tillage soybean-corn rotation, a reduction of at least 11 % of the soil C pools was observed. However, the adoption of no-tillage as an alternative to tillage with a moldboard plow (conventional system) reduced CO2 emissions by... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Conventional tillage; No-tillage; Microbial biomass; Particulate organic matter. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100507 |
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