and reforestation is being researched for cost reduction by using logging machines in reforestation. In this study, we researched clearcutting and reforestation productivity and cost with the vehicle logging system in three areas that included five gentle slope forest stands in Nagano Prefecture. As the results revealed labor productivity of m man-day in clearcutting operations, we expect productivity of about m man-day with similar systems. In our site preparations, the grapple loader showed higher productivity than human power, and use of the loader reduced cost to as compared to human power. The forwarding operation of carrying seedlings was reduced to of the usual cost. The planting productivity of the containerized trees was significantly higher than that of bare-root trees, but also higher in cost. To balance cost cutting with efficiency, we expect a lower price for containerized trees.
and Initial Growth Rate of Cryptomeria japonica Containerized Seedlings Planted in Northern Nagano Prefecture. J Jpn For Soc 98: 227 232 We investigated and compared the survival ratio and initial growth rate during two years after planting between the containerized and bare-root seedlings of Cryptomeria japonica in Shinanomachi, northern Nagano Prefecture, located in the cool and dry inland region in Japan. The survival ratio of the containerized seedlings was similar to that of bare-root seedlings. The first-year height growth rate was less than one cm per year for both seedling types, suggesting that the strong water stress was caused by planting shock. The second-year height and diameter growth demonstrated recovery, but containerized seedlings showed less than bare-root seedlings. We also found that the second-year growth was negatively affected by competition with weeds, suggesting that the small first-year height growth in this study site might be a serious disadvantage for healthy seedling growth and cost savings on weeding.
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