Composição da manta florestal sob povoamentos de Pinus taeda L. na região de Telêmaco Borba - PR

Abstract

Plantations with 7, 10 and I-l years old in the Telêmaco Borba region of Paraná were sampled to determine the dry matter anti nutrient contents of the forest floor components. Sixty 0.25 m2 sample plots were ramdomly placed under 7 years old plantation to collect the forest floor. Under each 10 and 14 years old. plantations were used 180 plots. The forest floor contained 7.7, 19.7 and 24.3 t/ha of biomass under 7, 10 and 14 years old plantations respectively. Tlte forest floor under 7 years old plantation contained the following weigltts of nutrients, in kg/ha: 61.82 of N, 4.82 of P, 8.57 of K, 41. 74 of Ca, 8.18 of Mg, 5. 78 of Fe, 3. 74 of Mn, 0.034 of Cu, 0.081 of Zn and 0.244 of B. The forest floor under I 0 years old plantation contained the following weigltts of nutrients, in kg/ha: 161.05 of N, 10.67 of P, 9.22 of K, 61.26 of Ca, 9. 71 of Mg, 25.02 of Fe, 4. 94 of Mn, 0.081 of Cu, 0.163 of Zn and 1.01 of B. Tite forest floor under 14 years old plantation contained the following weigltts of nutrients, in kg/Ita: 84.96 of N, 13.39 of P, 8.42 of K 87.52 of Ca, 14. 20 of Mg, 21.31 of Fe, 6.25 of Mn. 0.144 of Cu, 0.231 of Zn and 0.751 of B.