毎木調査のエネルギー代謝率について

Abstract

森林作業能率の研究を進めて行く上に先ず最初に必要なことは, その作業強度の決定である。本研究は, 森林調査の一つである毎木調査の作業強度を明らかにする目的で, 傾斜, 作業速度, 斜面の上り下り, 作業員の年齢の4因子についてそのエネルギー代謝率を測定した結果をとりあつかったものである。試験地は京都府立大学大枝演習林第9林班は小班内の35年生ヒノキ林分中に設定した。解析の結果エネルギー代謝率については, 1) 作業員の年齢間では差は認められなかった。2)傾斜, 作業速度, 斜面の上り下りの各因子によって, 大きな差が認められた。3) 上記4因子の組合せによる相互作用については, 影響は認められなかった。4) 斜面の上り下り別, 傾斜緩 (10° - 15°)・中 (20° - 25°)・急 (30° - 35°)・別のエネルギー代謝率と, その消費熱量は, 上りの場合はそれぞれ 2. 11 . 3 . 19cal/分, 3. 02. 4. 06cal/分, 4. 55. 5. 51cal/分, であり, その平均は 3. 23. 4. 26cal/分である。また, 下りの場合は 1. 45. 2. 57cal/分, 2. 21. 3. 29cal/分, 3. 21. 4. 24cal/分であり, その平均は 2. 29. 3. 36cal/分であった。

This paper is a result of the investigations of the intensity of the labour of cruising the forest stand which were caried out as one of the studies of the efficiency of forest inventory. The experiments were conducted for eight days in the Ōe Experimental Forest of the Kyoto Prefectural University. In order to estimate the intensity of the labour, the ralative metabolic rate (R.M.R.) was measured for six workers under all the possible combinations of the factors such as inclination of slope, tempo of working, "going up or down a slope" and the age of workers, which were supposed to affect the intensity of labour of cruising the forest stand. The results are as follows : 1) No significant differences between the age groups were found concerning the relative metabolic rate. 2) The inclination, the tempo and "going up or down a slope" greatly affected the relative metabolic rate, but no interactions between them were recognized. 3) The relative metabolic rate and the consumed calorie in easy slope, middle slope, and steep slope were 2.11, 3.19 cal/min, 3.02, 4.06 cal/min, and 4.55, 5.51 cal/min, respectively in going up a slope, and 1.45, 2.57 cal/min, 2.21, 3.29 cal/min, and 3.21, 4.24 cal/min. respectively in going down a slope. 4) The average relative metabolic rate and the average consumed calorie were 3.23 and 4.26 cal/min. respectively, in going up a slope, and 2.29 and 3.36 cal/min. respectively in going down a slope.