Cut-to-length logging
Cut-to-length logging is a mechanized harvesting system in which trees are delimbed and cut to length directly at the stump. CTL is typically a two-man, two-machine operation with a harvester felling, delimbing, and bucking trees and a forwarder transporting the logs from the felling to a landing area close to a road accessible by trucks.
CTL is the primary logging method in European countries, while full-tree logging and the even older technique of tree-length logging are more popular in North America and less developed countries, where tree sizes can exceed the capacity of the harvester's felling head, i.e., tree stems with a butt diameter of over 90 centimeters. CTL lends itself to timber harvesting in plantation forestry where stems are often harvested before they reach large dimensions.
Advantages compared to full-tree logging
- Cleaner wood since the logs are not skidded on the ground to the landing
- More fresh wood
- Less damage to retained trees in thinning operations
- Typically requires fewer types of machines in an operation
- No need to clear large landings close to the road
- Greater personnel safety due to enclosed/protected machine cabs
- More environmentally friendly due to:
- *less soil disturbance than in skidding operations
- *no slash dumped at the landing
- *higher retention of foliar nutrients within the harvested area
Disadvantages compared to full-tree logging
- Somewhat higher capital cost per volume when used in large scale clear cuts
- Use of more advanced technology requires more operator knowledge and training