Quantidade de carbono e nitrogênio via serapilheira de diferentes materiais genéticos de Eucalyptus spp.

Abstract

The present study aims to determine the amount of C and N present in the litter produced in ten different genetic materials of Eucalyptus in three different fractions (leaves, branches and miscellaneous). As well as levels produced in each month and their correlation with the dendrometric variables (total height and DAP) and with climatic variables (temperature, relative humidity, wind speed and precipitation). The collections were made monthly for a period of 36 months. The total litter in kg / year did not present significant variations, E. camaldulensis was the one that presented the largest quantity of litter in two of the three years of study. The correlations with the dendrometric variables presented only weak and medium correlations, not being a predominant factor in the amount of deposited material. For the climatic variables, the wind velocity was the one that provided greater amount of strong correlations. For the determination of C and N was using the methodology of Tedesco (1995). In the determination of N, values between 0.50 and 4 were found, which is in agreement when compared to other studies. The C found provided a range of 60 to 70% values somewhat above those found in other studies. The C / N ratio presented values of 10.8% of individuals within the range of 20 to 30, 5% <20 and 84.2%> 30, indicating a slow decomposition of the litter.