RODRIGUES, J. P.; http://lattes.cnpq.br/6893351847342605; RODRIGUES, Joaquim Pereira.
Resumo:
The Brazilians species of Eucalyptus and Pinus present a high resistance levei to the
forest fires, being considered, for some, as plants active pyrofits. And, for this reason it
wonders: Did the behavior of the seeds of those species develop exclusively in relationship
the disturbances produced by the fire or for the thwart, do other causes influence in that
process and if, those species developed answers similar adapted? To answer these questions,
seeds of five species of Eucalyptuses and three of Pinus were submitted at different thermal
intensities and time of exhibition, for similar answer to the different fire regimes, evaluating
the effects provoked by high temperatures were submitted the one , as well as the effect of the
ashes, had as the element more notable of the environment in that must grow the plants later.
The material employed vegetable was produced and acquired by 1PEF (Researches and Forest
Studies Institute) in Piracicaba; SP. To evaluate the answer of the seeds to the effect of the
temperatures, it was made use of the statistical lineation entirely casualty with factorial
arrangement. In the absence of thermal treatments, the of Eucalyptus and Pinus seeds already
registered discharges germination rates and strong reduction starting from temperatures equal
or superior to 70 °C suggesting that are not really plants active pyrofits. The values of the
germination obtained with the temperature treatments same to 50 °C they differed
statisticiality of control, however the reduction of the germination, in médium terms, was of
5% (87 for 92% of control), being very similar for ali the species of Eucalyptus and Pinus
seeds studied. When the values of the temperature are same or superior to 110 °C an
important reduction of the germination of the seeds of ali the treatments it is observed. The
simultaneous evaluation of the heat and of the ashes, it showed the interaction existence
between both the factors, with total inhibition of the germination in some treatments.