Harvest Systems for Implementing Silvicultural Objectives

Loren Kellogg, Forest Engineering, Oregon State University, Corvallis, OR

The complete range of silvicultural prescriptions for both even and uneven age systems are best accomplished by using different harvesting systems recognizing the inherent capabilities and limitations of equipment and systems. There are many types of machines and harvest system options however in a given geographical area; local availability, experienced personnel, or cost may limit the choices. Environmental performance among major harvest systems (ground-based, cable, & aerial) does vary somewhat however each system can perform well when selecting and operating the machine/systems within the limits characterized by its basic features. Research results from Pacific Northwest coastal and interior forests have identified important factors for success with different harvest systems in a range of silvicultural applications including thinning, fuels reduction, and uneven age prescriptions. Important harvesting system considerations for implementing silvicultural options include (1) an integrated silviculture and harvesting feasibility planning approach, (2) matching appropriate harvesting equipment and systems (capabilities and limitations) to the terrain and stand conditions, and (3) obtaining the knowledge and skills for successful planning, implementation and monitoring of harvesting operations to be effective at silvicultural practices.