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.
2016 A Simple Method to Calculate the Upper Limits on Silviculture Cost. J Jpn For Soc 98: 31 38 The upper limits on silviculture cost that will allow a forest manager to produce a profit under the optimized controllable variables of given profit models can be defined as the allowable upper limits. A simple calculation method for determining these limits will be useful for designing a subsidy system and examining its validity. In this paper, we derived a simple calculation method with the following simplifications: only rotation age is the only controllable variable; thinning profits and upkeep costs are ignored. The formula can be applied in cases where either the both soil expectation value SEV or net present value of the yields NPV is defined as the management criterion of the forest. The formula is derived from a hypothesis that the net profit at clear cutting grows according to a Richards or Gompertz function. If the following conditions are met, the formula can be applied: the height of dominant trees grows according to these functions Richards or Gompertz , the relationship between the height of dominant trees and yield volume per area is exponential, and the net profit per volume at clear cutting is constant. Using the formula, the upper limits on the silviculture cost for four major species planted sites of each quality at Nagano Prefecture were calculated. The calculation shows that the silviculture cost should be controlled at less than million yen ha except for Hinoki and Sugi at the best quality site, and the subsidy for silviculture rate should be more than except for Japanese larch at the best quality site.
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