03190naa a2200517 a 450000100080000000500110000800800410001902200250006002400400008510000270012524501330015226000090028552016040029465000280189865000130192665000230193965000180196265000220198065000250200265000220202765000210204965000100207065000200208065000240210065000270212465000250215165000100217665000130218665000290219965000170222865000260224565300240227165300230229565300140231865300240233265300310235665300170238765300380240465300180244265300260246065300290248665300200251565300320253565300210256777300840258815067022021-07-28       2000    bl uuuu     u00u1 u    #d  a0378-1127 (impresso)7 a10.1016/S0378-1127(99)00117-6.2DOI1 aOLIVEIRA, M. V. N. d'.  aArtificial regeneration in gaps and skidding trails after mechanised forest exploitation in Acre, Brazil.h[electronic resource]  c2000  aThe natural regeneration of some desirable species under exploitation pressure in Amazon is often very poor or non-existent. The traditional techniques of enrichment planting have presented low performance of the planted seedlings and high costs for its implementation. This study analyzes the first 5 years of growth and survival of five tropical tree species (Bertholletia excelsa, Ceiba pentandra, Torresia acreana, Swietenia macrophylla and Cedrela fissilis) planted in skidding trails and exploitation gaps. The basic planting technique consisted in using the cleared areas after forest harvesting for the establishment of seedlings of species ecologically adapted to the gap environment. The study was carried out in the EMBRAPA-CPAF-ACRE (Agroforestry Research Centre of Acre) in Acre State in West Amazon. The diameter increment varied from 0.30 cm year?1 for Bertholletia to 0.52 cm year?1 for Swietenia and Torresia. After 5 years the height growth was similar for all species around 3.0 m. In the first year Bertholletia presented a high mortality, around 80%, caused by severe predation by rodents. Ceiba also presented a high mortality after the second year of planting probably due the canopy closure. The best survival percentage was presented by Torresia, over 90%. The Meliaceae (Swietenia and Cedrela) species had a similar survival, around 70 to 75%. The Hypsipyla grandella attack was more severe in Cedrela than in Swietenia, but in both cases (9.37 and 31% after 7 and 5 years respectively for Swietenia and Cedrela) was still low when compared with other enrichment plantings.  aArtificial regeneration  aForestry  aGrowth performance  aMechanization  aTimber production  aBertholletia excelsa  aCastanha do pará  aCedrela fissilis  aCedro  aCeiba pentandra  aEssência florestal  aExploração florestal  aFator de crescimento  aMogno  aPaineira  aRegeneração artificial  aSilvicultura  aSwietenia macrophylla  aAmazônia Ocidental  aCastanha do brasil  aCerejeira  aCiencias forestales  aDesempeño del crecimiento  aEmbrapa Acre  aExploração florestal mecanizada  aMecanización  aProducción de madera  aRegeneración artificial  aRio Branco (AC)  aSobrevivência de espécies  aTorresia acreana  tForest Ecology and Management, Amsterdamgv. 127, n. 1/3, p. 67-76, March 2000.