Mechanized Logging

Information about Mechanized Logging

Published on January 2, 2008

Author: BAWare

Source: authorstream.com

Content

Mechanized Logging Methods:  Mechanized Logging Methods Mechanical felling, tree processing & forwarding equipment and systems There are different levels of mechanized logging methods ….:  There are different levels of mechanized logging methods …. E.g. “Low Level”: chainsaw felling & tree processing – line skidding “Medium Level”: chainsaw felling – line skidding & tree processing at landing “High Level”: harvester felling and tree processing – forwarding logs to landing Mechanized Logging Methods (higher levels):  Mechanized Logging Methods (higher levels) General Disadvantages Capital costs Equipment utilization Machine interaction Hot logging Cold logging Tree size & terrain limitations General Advantages Efficiency in harvesting small trees Applications in commercial thinning High technology benefits Improved safety Mechanized Harvesting Systems:  Mechanized Harvesting Systems Forest Resource management considerations with alternative mechanized harvesting systems ? :  Forest Resource management considerations with alternative mechanized harvesting systems ? Forest Resource management considerations with alternative mechanized harvesting systems …. Selecting a harvesting system? :  Forest Resource management considerations with alternative mechanized harvesting systems …. Selecting a harvesting system? Soil degradation (disturbance, rutting, compaction, impacts on water quality) Long term site productivity – the amount, composition, and location of woody debris Where are the tree limbs and tops located? Soil nutrient source? Fire risk? Damage to residual trees in a partial cut Skidding distances and amount of area in truck roads Landing size and spacing Stand characteristics and terrain Silvicultural strategy Equipment availability & logging expertise Single-grip Harvester:  Single-grip Harvester 18” – 24” tree size 30’ max. boom reach Rubber tire or track carrier Forwarder:  Forwarder 5 – 20 ton payloads 4 – 8 wheel drive Cut-To-Length System:  Cut-To-Length System Applications: Thinning & fuels reduction Forest Resource Considerations: Tree limbs & tops left on forest trails - no landing slash - soil nutrient source - equipment travel on slash - fire risk -- may require follow-up slash treatment Small landings Low stand damage Long forwarding distance – fewer roads Cut-To-Length System:  Cut-To-Length System Forest Resource Considerations: Soil displacement (rutting) can occur on forwarder trails Little soil scarification during logging – may require scarification for natural regeneration Other Considerations: Improved fiber recovery (e.g. lower value pulpwood) Computer aided bucking decisions Longer operating season Short log handling system – complete system change Longer term landowner commitment is important Operator training Double-Grip Harvester:  Double-Grip Harvester Tree-Length System:  Tree-Length System Forest Resource Considerations Tree limbs & tops left on forest trails BUT not dispersed as well compared to a cut-to-length system Landings are larger than a cut-to-length system Higher risk for residual stand damage than cut-to-length system Fell and Bunch :  Fell and Bunch Equipment options & terminology: Drive-to-tree Swing boom (excavator base – not self-leveling) Swing boom (purpose built - self-leveling) Semi-walking or walking Slide17:  Drive-to-tree machine Drive-to-tree machine Drive to Tree Machines Slide18:  Swing boom Feller Buncher Excavator base – not self leveling Purpose built – self leveling Purpose Built – Self Leveling Excavator Base Slide19:  Walking machine Slide20:  Shear Cutting Head Slide21:  Non-Shear Cutting Heads Circular Saw - Continuous - Intermittent Chain-and-Bar Saw Skid or Yard Whole Trees:  Skid or Yard Whole Trees Tree Processing at the Landing:  Tree Processing at the Landing Equipment Options & Terminology: Gate delimber Stroke-boom delimber Stroke-deck delimber Grapple processor (dangle head) Pull-through delimber Chipper Chain flail delimber/debarker & chipper Slide24:  Gate Delimber Slide25:  Stroke Boom Delimber Slide27:  Stroke Deck Delimber Slide28:  Grapple Processor limbing & topping only; no felling Slide29:  Pull Through Delimber Slide30:  Chain Flail Slide31:  Chain Flail and Chipper Whole-tree System:  Whole-tree System Applications: Clearcut & fuel reduction Forest Resource Considerations: Tree limbs & tops brought to the landing - large landing slash piles - soil nutrient problems on some sites - “clean logging” of site may eliminate burning & site preparation need - opportunities to utilize slash at the landing Large landings needed Equipment doesn’t travel on slash mat Hard to control damage to residual trees in thinning

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