Nilton César Fiedler

Efeito de incêndios florestais na estrutura e composição florística de uma área de cerrado sensu stricto na fazenda Água Limpa-DF

This research aimed to evaluate the effect of fire on the structure and floristic composition of a 10 ha cerrado sensu stricto area located at the Ecological and Experimental Reserve of the University of Brasilia, Fazenda Agua Limpa-FAL. Two assessments were conducted in the area: the first, after the area had suffered a criminal fire in 1999, and the second in 2002. A sample of four 20 x 50 m permanent plots was assessed. All individuals with stems 5 cm diameter at 0,30 m (Db) from the ground level were registered, and had their Db and total height measured. Density, basal area, frequency and value of covering index were calculated for the two assessments. The floristic similarity between the two surveys was evaluated for qualitative data (presence and absence of species) based on the Sfrensen Index. Few changes were observed in the floristic composition of the community during the studied period. There was an increase of 125% in density by hectare from 1999 to 2002. A high similarity (Sfrensen Index equal to 0.68)was found between the two assessments while diversity (Shannon Index) was small (about 2.5). This value is smaller than those found in natural areas of the Cerrado sensu stricto at Fazenda Agua Limpa, although it is common in areas with disturbances. Three years after fire 13 new species were verified in the area.

Custos e rendimentos operacionais de um plantio de eucalipto em região de cerrado

The research in question was executed in an area dedicated to the stablishment of eucalipt forest population in the University of Brasilias Agua Limpa Farm, with the aim of evaluating the production costs and time in the stages of seedling production, soil preparation, plantation and cultural treatments. All production costs of the various stages were analysed. Time was measured with the use of the individual time method. According to the results, the average cost for the establishment of one hectare of eucalypt was R

Avaliação de brigadas de incêndios florestais em unidades de conservação

703,02. The highest costs were obtained in the acquisition of trays and tubes (28,3%), ant extermination (16,7%), soil preparation (14,0%) and labor (11,0%). The highest consuming time was verified during weeding (27,0%), plantation (22,0%), cultivation at nursery (19,0%) and fertilization (13,0%).

Avaliação do nível de ruído em marcenarias no Distrito Federal, Brasil

The objective of this study was to determine the working conditions and training level of forest fire volunteers of the Jardim Botânico de Brasilia, IBGE Ecological Reserve and Agua Limpa Farm, Universidade de Brasilia. The study was carried out during the first semester of 2000 on the headquarters of the three brigades located in each Conservation Unit. The methodology consisted in applying questionnaires and interviews to the brigadiers and their coordinators. The data set was analyzed for the three brigades, with the best training level and brigadier satisfaction being found at the IBGE Ecological Reserve, and the worst at the UnB´s Agua Limpa Farm. No individual protection equipment was available to the forest fire fighters and the number of forest fire fighting equipments and tools was not sufficient. No road maintenance machines were at the disposal of the brigades. Only the IBGE Ecological Reserve Brigade was supplied with a pipe truck for forest fire fighting. Agua Limpa farm Brigade had the greatest participation in educational campaigns at the nearby communities. It was concluded that all the brigades have a good training and skill level and despite the limitation of tools and equipments, they are able to fight small forest fires. The worst problem found was the lack of individual protection during forest fire fighting, what may cause accidents.

Fatores econômicos relacionados à intervenção na vegetação para a implantação de linhas de transmissão no estado de Rondônia.

This research was carried out in a carpentry in the Federal District, Brazil, with the objective to evaluate and to compare the noise level emitted by the machines used in the manufacture of furniture in four establishments. The evaluation was made with the one noise level measured and it was located as to ear of the worker while operating the machine as per NR15 norm. Six machines were evaluated. The statistical analysis was done using factorial design and mean test. The results indicated significant differences at 5% probability level among machines in the four companies. The mean noise level was of 92,16 dB(A). The highest value was found in the buzz saw in company 4 (101 dB(A)). The horizontal wimble was the only machine in all the companies that fitted with in the limits allowed in the NR15 norm (85 dB(A)) for a daily working of 8 hours. The other machines presented problems related to the noise emission.

Avaliação técnica e econômica do Forwarder na extração de toras de pinus

The study was made on an electric energy transmission line between the cities of Ji-Parana and Pimenta Bueno, in the State of Rondonia. The objective was to quantify the economic factors related to the suppression of vegetation by traditional and selective methods. The selective method cost was estimated according to the number of individuals per hectare, the area of intervention and the cost of felled trees. The total cost of the traditional method was determined by the area of intervention and by the cost of deforested hectares. The transposal of a fragment with the use of seven 55m towers, with no intervention in the vegetation, generates an increase of only 2,8% on the total cost, if compared to the cost of employing seven 35m towers plus the costs of a selective intervention in the vegetation. In the selective method, the number of individuals per hectare is the most important variable because it indicates directly the value to be wasted with the felling of trees. The traditional method will grow out of use because it does not offer big advantages in tecnicals envairomentals and economics terms.