Reliability of results of beech high stand inventory by sample method
2006
Koprivica, M.,Institute of Forestry, Belgrade (Serbia)
The variation and precision (reliability) of estimate of taxation elements in beech high stand was researched by the sample method. Five characteristic stands were selected based on their diameter and height structure, as well as their spatial variation. They are uneven aged beech stands, with a slight percentage of other tree species. The stand inventory consists of a systematic distribution of sample plots sized 500 cubic meter. The sample size is 10-29 sample plots, and the attained precision of estimate (probability 95%) is from +/- 12% to +/- 23%. The coefficient of variation of stand volume is 27%-49%, Average coefficient of variation is about 35% and double relative error (for the sample of 20 sample plots) is +/- 16.0%. Altogether 100 sample plots, i.e. 1327 trees were measured (diameter above 10 cm).
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