0023-6152

AA00697606

23871

査読無

0023-6152

AA00697606

The state forest in Sao Paulo, Aguas de Santa Barbara, are mostly covered by pine plantation. Since all of these forest are the first plantation, there is still no establishment of the estimation method for their growing stock and growth of forest stand. Forest inventory by sampling has never been conducted yet. In this study, the systematic line-plot sampling, which is an effective method for the estimation of growing stock, has been experimentally applied on a stand of 1 Talhao (25 ha). Further, for the growth of forest stand estimation, the increment core survey was also conducted. In studies area, 35 plots of 0.04 ha has been investigated, and for the growth of forest stand estimation 105 stem of sample trees have been measured. The survey was conducted by a team consists of 4 persons, during 5 days. As the result, the estimated values for the mean and total number of trees, and for the mean and total volume (per 1 Talhao) are as follows. (1) Number of trees ; (i) per ha for to5 : 937.5 i37.1, for t._01 : 937.5f49.9. (ii) Per 1 Talhao for t._05 : 23438±927, for t._01 : 23438±1248. (2) Volume(m^3) ; (i) Per ha for t._05 : 153.93±22.39, for t._01 : 153.93±30.15. (ii) Per 1 Talhao for t._05 : 3848.3t559.6, for t._01 : 3848.3±753.7. Further, the plot sampling error for number of trees and volume are equal to 3.95 % and 14.54 %, respectively. The coefficient of variation for number of trees and volume are equal to 11.86 % and 43.37 % respectively. Regarding the growth of forest stand, it was found that the growth of forest stand per ha to be 14.3718 m^3, and the per 1 Talhao is equal to 359.2946 m^3. The corresponding growth percent of forest stand is equal to 9.27 %. The total time spent for the measurement of 32 plots, as presented in Table 2, was amount to 851 minutes, where 1 plot at average takes 26.6 minutes.