Densidade e incremento diamétrico de árvores individuais da floresta ombrófila mista

Abstract

This study aimed to provide answers about the diameter growth for individual trees of different layers of the Mixed Ombrophylous Forest of São Francisco de Paula, in northeastern Rio Grande do Sul, as well as present methods of determining the density considering angular sampling methods. Therefore, were used 8 years remeasurements of 262 Araucaria angustifolia individuals, 111 Blepharocalix salicifolius individuals, 115 Cryptocaria aschersoniana individuals and 154 Casearia decandra individuals, sampled in the permanent plots of the Project PELD CNPq. Using angular counting methods, the density point was determined, in basal area and number of trees per hectare, in each location point of the studied species and evaluated its influence on the growth of these individuals. Proceeded a detailed analysis of the dimensional characteristics and competition for each species. Using correlation analysis, covariance and regression, increment models were adjusted, stratified by the highest correlation with the diameter increment. Was used the annual periodic increment, calculated based on the diameter increment of the individuals in the analyzed period. Generally, the point density showed a significant effect on the increment in diameter. The methodology for calculating the number of trees per hectare more correlated with the increase in diameter was Linares and Zagoya. Models resulted in good estimates of the increase, however, showed wastes with a strong tendency. The inefficiency of models can be attributed to the little distinction between the variables in each of the stratifications. For individuals of Araucaria angustifolia and Blepharocalix salicifolius was possible to stratify the individuals by diameter class. As for the Cryptocaria aschersoniana and Casearia decandra, there was a value tendency stratification. For each species at each of the stratifications, different variables had an effect on the increment of diameter with total height, a variable influence on the growth of all individuals studied. The site features of the species showed no explanatory distinctions of the increment.