59 樹幹直径について
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概要
- 論文の詳細を見る
1. I devised the following EMPIRICAL FORMULA for making easier and more accurate the measurement of the diameter of tree.d_o=0.4D+0.6d d_o……DIAMETER D……MAXIMUM AXIS of the cross section.d……GREATEST AXIS that is at right angles to the MAXIMUM AXIS of the cross section.2. By this EMPIRICAL FORMULA, Measurement of the cross section-area was actually made of 66 "SUGI" (Criptomeria japonica D. DON) and 50 "AKAMATSU" (Pinus densiflora SLEB. et ZUCC) Produces from ONSEN-GUN, EHIME PREFECTURE, SHIKOKU, JAPAN.3. The results thus obtained were compared respectively with those secured by using the following popular FORMULA, d_o=(D+d)/2 4. and I found that my method is superior to the above mentioned method in the probabilities of POSITIVE, NEGATIVE, MAXIMUM ERROR, as well as STANDARD DEVIATIONS.5. I may confidently say, therefore, that my method is the more practical and accurate one for use in determining the diameter of trees.
- 一般社団法人日本森林学会の論文
- 1951-11-25