das Flores O.M.M.,Ciencias Florestais |
de Queiroz W.T.,Institute Ciencias Agrarias |
Pinheiro J.G.,UFRA |
Oliveira F.A.,Institute Ciencias Agrarias |
And 2 more authors.
Acta Amazonica | Year: 2012
We conducted a study with sample units of conglomerate structure using cross-database of forest inventory 100% of Annual Production Unit (APU-08), located at the Top Pacajá Martins farm, municipality of Portel-PA to study the effects of variation between and within clusters with reference to three response variables they were: i) VT = Total volume of wood of 77 tree species found in the study area, ii) VO = Total Volume of the 10 most frequent tree species and volume in the study area and, iii) Vt = Total volume of 10 forest species Cikel more commercialized by the company we aimed to determine the ideal size and distance of plots from the Method of Maximum Curvature, once defined the size, its area was fixed and then there was tested five different values to determine the ideal distance from the center of the conglomerate to the plots and between them. Results showed that the size of 0.10 ha plot, the distance of 50 m between plots, and cross-structure with 8 subplots are efficient for estimating the parameters.
da Silva Lopes E.,UNICENTRO |
Vosniak J.,Ciencias Florestais |
Fiedler N.C.,UFES |
Floresta | Year: 2011
The aim of this research was to analyze human factors and work conditions in forest planting operations. Data were collected by interviews with 48 workers of hole-digging, planting and fertilizing activities. The results indicated that the workers average age was 31.7 years, height 170.1 cm and body weight 74.2 Kg. 77.9% were of rural origin, 58.9% were married and 77.5% did not reach basic schooling. The average job time in the company was 30.4 months and the average time of activity experience was 23.0 months. Most (58.3%) of the workers of hole-digging were dexterous and 41.7% were left-hand, which may influence the adaptation of workers in operation of the equipment. The high incidence of leg (40.7%) and back pain (30.3%) was affirmed by the workers of hole-digging as caused by the high weight of the equipment. The helmet with visor was appointed by workers as cause of headaches and vision difficulty and gloves were identified as cause to wet hands and hardly handling punch land in work.
Effect of different classes of height and pruning intensity on growth of a hybrid eucalyptus [Efeito de diferentes classes de altura e intensidades de desrama artificial sobre o crescimento de um híbrido de eucalipto]
Cezana D.P.,Ciencias Florestais |
Chichorro J.F.,UFES |
Martins L.T.,Ciencias Florestais |
Cotta T.R.,Ciencias Florestais |
Silva J.L.,Ciencias Florestais
Floresta | Year: 2012
This study aimed to evaluate the effect of interaction between pruning intensity and height class on the growth of the hybrid Eucalyptus grandis x Eucalyptus urophylla. The experiment was installed on a sloping area in the municipality of Mimoso do Sul, ES. The design used was the completely randomized in factorial arrangement 4 × 4 (classes of height × pruning intensity). That revealed that as the classes of height as the pruning intensity had significant effect on tree growth at 5% probability, indicating that trees larger than 4 meters of height had more intense growth than trees located in lower stratus and with increase of pruning intensity; there were a reduction on the growth, and the 80% pruning treatment presented smaller diameter and height growth. Interaction between pruning intensity and height class on the trees' growth was not significant at 5% probability.