Mudanˋas temporais na composiˋˋo flor赤stica e na diversidade de um cerrado sensu stricto do Brasil Central em um per赤odo de 18 anos (1985-2003)

作者：Libano; Andrea Marilza; Felfili; Jeanine Maria

来源：Acta Botanica Brasilica, 2006.

DOI：10.1590/S0102-33062006000400016

• dynamics
• vegetation
• community
• savanna
• fire.

inventories were conducted at three-year intervals in 19 permanent plots of 1000 m2 located at fazenda 芍gua limpa (fal) - df. three events of disturbance by fire occurred in the area. a total of 69 species, 54 genera and 35 families were registered. floristic composition was compared using the modified morisita-horn index, a quantitative similarity index, and sˋrensen, a qualitative index. both indices showed high similarity between inventories with little change in species composition over time. changes in richness caused differences in the values of simpson%26apos;s index, and shannon%26apos;s index according to hutcheson%26apos;s t-test (p %26lt; 0.05). floristic composition has not changed over time under the current fire regime. but diversity increased after a longer interval without fire. in this nine-year period free from fire, new species appeared and others returned to the plots, increasing diversity, but not up to its initial values.