Energy use and environmental impacts of forest operations in Sweden

摘要

An inventory of energy use in forest operations in Sweden 1996 and 1997 comprises all operations including seedling production, silviculture, logging and secondary haulage to forest industries. Energy use in Swedish forestry was about 150-200 MJ/ m~3 of timber, depending on the locality in Sweden. This inventory demonstrates much higher energy use for secondary haulage than was anticipated by earlier studies. In contrast to this, energy use in logging shows a slight decrease compared to the state of operations a decade earlier, possibly reflecting improvements in technology and management. Although secondary haulage operations account for the largest share of the energy used, logging and silviculture generate the highest levels of certain exhaust emissions. Emissions were either fuel-related (CO_2, SO_x) or engine-related (hydrocarbons, NO_x). Use of renewable fuels and improvements in engine design and the better adjustment of engines to forestry operations could decrease these kinds of emissions. The emission of gases that contribute to climate change is very small compared to national emissions. Nevertheless, there is scope for a further decrease of this contribution. Timber is an interesting raw material for alternative fuels, thus enabling a better market prospect for such timber that does not meet the specifications of traditional forest industry.