Growth modeling of Cryptomeria japonica by partial trunk analysis
DOI:
https://doi.org/10.4336/2017.pfb.37.90.1371Keywords:
Probability analysis, Increment, Forest managementAbstract
This study aimed to evaluate the growth pattern of Cryptomeria japonica increment (L. F.) D. Don. and to describe the probability distribution in stands stablished at the municipality of Rio Negro, Paraná State. Twenty trees were sampled in a 34 years-old stand, with 3 m x 2 m spacing. Wood disks were taken from each tree at 1.3 m above the ground (DBH) to perform partial stem analysis. Diameter growth series without bark were used to generate the average cumulative growth curves for DBH (cm), mean annual increment (MAI) and current annual increment (CAI). From the increment data, the frequency distribution was evaluated by means of probability density functions (pdfs). The mean annual increment for DBH was 0.78 cm year-1 and the age of intersection of CAI and MAI curves was between the 7th and 8th years. It was found that near 43% of the species increments are concentrated bellow 0.5 cm. The results are useful to define appropriate management strategies for the species for sites similar to the studying regions, defining for example ages of silvicultural intervention, such as thinning.
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