A study on the systematization of the helicopter type logging in forest management by the non-clear cutting method

采用量化方法，对1983年以后三年期间日本国家森林的直升机停机坪作业生产率与各种作业条件之间的相互关系进行了调查。结果表明，直升机种类对直升机堆场作业的生产力影响最大，其次是树种、平均每原木体积、有效载荷等。该定量方法分析结果可以预测不同操作条件下的生产效率。还对1986年日本国家森林的直升机停机坪作业费用与各种作业条件之间的相互关系进行了量化研究。结果表明，平均停飞距离对直升机停飞成本的影响最大，其次是树种、停飞区域的平均海拔高度和平均原木体积，直升机种类和平均循环载荷对成本的影响较小。分析结果可以预测不同工况下的运行成本。

The interrelationship between the productivity of helicopter yarding operation and various operational conditions was investigated, using the quantification method, on Japanese National Forests in the three-year-period following 1983. It was confirmed that the kinds of helicopters had the greatest effect on the productivity of helicopter yarding operations, and the tree species, average volume per log, payload, and so forth followed. The productivity under different operational conditions could be predicted by the results of this quantification method analysis.Also the interrelationship between the cost of helicopter yarding operation and various operational conditions was investigated, using the quantification method, on Japanese National Forests in 1986. It was confirmed that the average yarding distance had the greatest effect on the cost of helicopter yarding operations, and the tree species, average height above sea level in the yarding area, and average volume per log followed, but on the other hand, the kinds of helicopters and average payload per cycle had little effect on the cost. The cost under different operational conditions could be predicted by the results of this analysis.