Possibility of energy use of forest biomass and effect of forest road network in mountainous area.(<SPECIAL ISSUE>BIOMASS)

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  • 山岳森林地域における森林バイオマスのエネルギー利用の可能性と基盤整備の効果(<特集>バイオマス)
  • 山岳森林地域における森林バイオマスのエネルギー利用の可能性と基盤整備の効果
  • サンガク シンリン チイキ ニ オケル シンリン バイオマス ノ エネルギー リヨウ ノ カノウセイ ト キバン セイビ ノ コウカ

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Abstract

The costs of harvesting forest biomass resources, including cutting, chipping, yarding and transport, in the Chichibu area of Saitama Prefecture were calculated. The amount of biomass harvest from each subcompartment was calculated for the following three types of harvesting: thinning of artificial forests, final cutting of artificial forests, and thinning of natural forests. The harvesting type was determined from forest registers. Terrain and yarding distance were used to determine the system for harvesting biomass. Two scenarios for generating electrical power from biomass were considered. In the first scenario (Scenario A), a medium-scale power plant would be set up in the middle of the target area. In the second scenario (Scenario B), nine small power generating facilities would be set up in each of the 9 municipalities of the target area. Compared with Scenario A, the cost per cubic meter of biomass would lower in Scenario B; however, the cost per kilowatt of power would be higher in Scenario B because of greatly varying differences in power generation efficiency. In Scenario A, 19GWh/year of electrical power could be produced, but in Scenario B, the power production would be too low and would not be cost effective. If the yarding distance was shortened by 100m, the amount of energy that could be produced in Scenario A would increase slightly. If the maximum yarding distance of all subcompartments were shortened to 100m, enough biomass to produce 92.4GWh/year of electrical power would become available in Scenario A. In Scenario B, the power plants would become cost effective and would have the potential to generate 2.8GWh/year of electrical power.

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