Abstract
Two permanent transects were established in a maquis on uplands in central Italy at the time of the last fire in the area, in summer 1984. The observations were carried out during five years in ten new-burned and nine old-burned plots. The results showed that the effects of fire on floristic composition are very temporary. Annual species increased only slightly because of the perennial woody and herbaceous species resprout vigorously. Changes of ß diversity and stability were also minimal ; in a short time (four years) the values of ß diversity, recorded in new and old-burned plots, became comparable but the structure of the two stands was still different. The reduction of disturbance (halting of grazing and longer intervals between fires) showed aremarkable impact on the structure of this vegetation, by favouring the dynamics towards the more-degraded and floristically unstable stages, where the perennial herbaceous species were prevalent.
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