Relaˋˋo entre a presenˋa de vegetaˋˋo herb芍cea e a regeneraˋˋo natural de esp谷cies lenhosas em pastagens abandonadas na Floresta Ombr車fila Densa do Sul do Brasil

作者：Cheung; Kwok Chiu; Marques; Marcia C M; Liebsch; Dieter

来源：Acta Botanica Brasilica, 2009, 23(4): 1048-1056.

DOI：10.1590/S0102-33062009000400015

• alien species
• atlantic forest
• ecological restoration
• secondary succession.

deforestation and conversion of forests to pasture is one of the most degrading activities impacting the atlantic rain forest. we analyzed pastures abandoned for 8, 14, 48, 50 and 96 months in antonina (paran芍 state; 25o19%26apos;15%26apos;%26apos; s; 45o24%26apos;24%26apos;%26apos; w) to verify if herb cover reduces the natural regeneration of the atlantic forest. we identified species and assessed shoot biomass of herbaceous species (in 24 1 m2 plots), and calculated the volume of all woody species (height %26gt; 1m; in 24 25 m2 plots). we collected 59 herbaceous species (1,062 individuals) most of which were allochthonous species (95%), including brachiaria decumbens and b. humidicola. we also sampled 104 woody species (2,234 individuals). there were significant floristic and structural changes in the community during the first four years since the pasture was abandoned. woody vegetation development was negatively related to herb species%26apos; biomass, suggesting that grasses (b. decumbens) inhibited forest regeneration. our results suggested that management, including brachiaria spp removal, is necessary for the restoration of abandoned pastures in the atlantic forest region.