Silviculture for Multiple Objectives in the Douglas-Fir Region

摘要

Silvicultural knowledge and practice have been evolving in the Pacific Northwest211u001efor nearly a century. Most research and management activities to date have 211u001efocused on two major topics: (1) methods to regenerate older, naturally 211u001eestablished forests after fire of timber harvest; and (2) growth and management 211u001eof young stands. Today forest managers can reliably regenerate the major conifer 211u001eand hardwood species under most conditions by using combinations of natural and 211u001eartificial regeneration. They also can control stand density and species 211u001ecomposition and growth of individual trees, thereby influencing stand structure. 211u001eAvailable growth models can reasonably predict the outcome of growing conifer 211u001estands under a range of densities, species composition, and management scenarios, 211u001eproviding tree numbers by size class as well as crown characteristics and wood 211u001eyields. Most silvicultural efforts have been financed through and directed toward 211u001eproduction of wood. Although some other values have been produced or improved in 211u001econjunction with such activities, public interest and emphasis on nontimber 211u001evalues have increased.