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Forest Operations Textbook
Extraction Extraction: Pulling the tree from the forest area (or 'stump') to a landing is referred to as extraction. When the tree’s are dragged out of the forest it is called skidding, when they are carried out on a trailer (forwarder) it is called forwarding. Any harvesting system that uses an extraction machine that drives into the forest is referred to as ground-based harvesting. By far the most common machine to carry out this task is the grapple skidder or the cable skidder. Forwarders, agricultural tractors, ATV’s and horses are also options for ground-based extraction. When extracting in very wet areas, it is possible to use a shovel, a machine that can lay out corduroy roads and ‘shovel’ the trees to those roads for the skidders. Two special extraction machines are a helicopter (aerial logging) and a yarder (cable logging) Equipment and Machinery used for extraction: |
 
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