We conducted the preliminary time studies of clear-cutting operations using a small-scale cable logging system in 62- and 107-year-old, gently and moderately sloping Japanese cypress forests. The cycle times, productivities, and costs were compared to examine the effects of extending the cutting age. The operation system included the use of a chainsaw for felling, a tower yarder for yarding, a grapple loader for bunching and piling, and a processor. For some 107-year-old trees, a chainsaw was also used for delimbing operations because of the larger branches. The productivities of felling and processing operations did not decline beyond a certain stem volume even with chainsaw felling and the use of a small-sized processor (6.7 t). The average cycle time of yarding operations in the 107-year-old forest was longer, but the productivity was higher compared to the 62-year-old forest, owing to larger volumes. Although geography and stand conditions differed, productivity and costs of the operation systems were similar even with larger volumes and using small-sized machines. The costs of the operation systems were JPY 2088/m³ and JPY 2307/m³ in the 107- and 62-year-old forests, respectively. The costs were slightly higher than those with larger ground based machines. A small-scale cable logging system, on a relatively gentle slope with larger volumes is an option for low-cost, clear-cutting operations in small-scale forestry.

中文翻译：

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使用小型电缆测井系统对62年和107年历史的日本赛普拉斯透明切割作业的周期时间，生产率和成本的比较分析

我们在62岁和107岁的日本柏木中度和中度倾斜的森林中，使用小型电缆测井系统进行了伐木作业的初步时间研究。比较了周期时间，生产率和成本，以检查延长切削年龄的影响。操作系统包括使用链锯进行砍伐，使用塔式堆料机进行堆料，使用抓斗式装载机进行捆扎和打桩以及使用处理器。对于一些已有107年历史的树木，由于树枝较大，还用链锯进行了下坡操作。即使使用链锯砍伐和使用小型处理机（6.7吨），砍伐和加工操作的生产率也不会下降超过一定的茎量。在拥有107年历史的森林中，平均进行堆放作业的周期时间更长，但由于产量大，与62岁的森林相比，生产力更高。尽管地理位置和立场条件各不相同，但即使在使用大容量机器和使用小型机器的情况下，操作系统的生产率和成本也相似。操作系统成本为2088日元/米107和62年历史的森林中分别为³和2307日元/ m ³。成本略高于大型地面机器的成本。小型电缆测井系统，在相对平缓的斜坡上，具有较大的体积，是小型林业中低成本，明晰的作业的一种选择。