Versides Sebastião Moraes e Silva

Determinação do volume, do fator de forma e da porcentagem de casca de árvores individuais em uma Floresta Ombrófila Aberta na região noroeste de Mato Grosso

This study aimed to test and select models, with and without bark volume, and to determine the form factor and bark percentage of an open ombrophylous forest in northwest Mato Grosso. 91 trees were cubed by obtaining diameter, bark percentage, stem height and solid stem volume. A total of 10 models were tested. Statistical procedures, such as adjusted determination coefficient, residual error and distribution of residuals, were tested. The selected models were validated by the L&O test. The average form factor was 0.7424 and 0.7297, with and without bark, respectively. The average volume of bark was 0.4292 m3 (7.45% of total volume). The Schumacher-Hall model showed the best performance for volumes with and without bark.

Composição, diversidade e similaridade florística de uma floresta tropical semidecídua submontana em Marcelândia - MT

The objective of this study was to analyze the floristic composition, diversity and similarity of a submontane, semideciduous tropical forest in Marcelândia-MT, in an ecological tension area in the forest contact region. The 33 families and 92 species specimens were found in 4008 individuals, in 74 plots of 10m x 250 m. The families that contributed most frequently to the floristic composition were Lauraceae (15.99%), Melastomataceae (12.97%), Sapotaceae (12.50%), Fabaceae - Mimosoideae (9.91%), Burseraceae (9.13%) and Moraceae (7.29%). The Shannon-Weaver diversity, Simpson concentration and Pielou evenness indexes indicated that the area presents relatively high diversity and low concentration of species with high uniformity in the ratios of individuals per species. The floristic similarity standards had low similarity among the evaluated areas evidencing the existence of phitogeografic standards based on the species distribution.

Prognose da produção de Eucalyptus camaldulensis Dehnh. pela aplicação da função de distribuição S B de Johnson

This study was carried out to accomplish the yield projection of Eucalyptus camaldulensis Delnh. in Cuiaba-MT. For the diameter distribution, the Johnson SBs function was adjusted by the methods of the moments. The model used to express the attributes of the forest was evaluated by the regression analysis. In general, the tests carried out showed that the model presented satisfactory fitting and was unbiased in the graphic analyses of the residues. The efficiency of the prognosis was appraised by the t-test, prognosis deviation and correlation between the predicted and the observed volume at the same age. The modeling process used allowed us to obtain the detailed tendencies of growth. From these tendencies, it can be concluded that the adopted methodology allowed us to obtain the estimates of the current or future production, making use of the group of bio-mathematical models discriminated for each phase of this study.

Incremento, ingresso e mortalidade em uma floresta de contato ombrófila aberta/estacional em Marcelândia, Estado do Mato Grosso

This research aimed to study the increase in diameter, basal area, volume, the entry, and the mortality of an open/seasonal ombrophilous forest in the city of Marcelândia. Data were collected in 69 permanent plots established in 2001 and remeasured in 2003 and 2007. The number of individuals and the increases in diameter, basal area, and volume for the period 2001 to 2007 were evaluated. The entry was determined by the trees that have reached or exceeded a diameter of 17 cm. Mortality was calculated as the sum of all found dead trees in each measurement with a diameter equal or more than 17 cm. In the considered period of six years, the results to the increase in diameter, basal area, and volume were respectively, 0.34 cm, 0.22 m².ha -1 , and 2.11 m³.ha -1 . The average values for the mortality rates and entry respectively were 0.78% and 0.30%.