A set of newly published studies evaluated nearly forty years of data on the impacts of biomass utilization on soil, tree, and plant recovery and found minimal impact using certain forest harvesting techniques.
The experiments, initiated in 1974, were conducted by scientists from the U.S. Forest Service Rocky Mountain Research Station on the Coram Experimental Forest, located in Northwestern Montana. In order to evaluate the ecological consequences of large-scale biomass harvesting, scientists implemented three different tree removal techniques on the landscape – group selection (remove small groups of trees), clearcut (remove all timber), and shelterwood (retain some trees for shade and structure) – all using cable logging. On all three sites the soil was left relatively undisturbed from the harvesting and varying amounts of downed wood were left to promote soil organic matter and wildlife habitat. For some sites, prescribed fire was applied to reduce fuels and fire danger. Scientists then tracked these sites over 38 years to provide a contemporary look at the long-term impacts of biomass utilization on forest productivity (e.g., tree growth).