Technodiversity Glossary

Full trees are chipped at a roadside landing

Functiogram

• At the roadside, one can use very large and powerful chipper that will offer the highest productivity and lowest cost
• More biomass is recovered (~20-30%) compared with chipping logs

• Whole-tree chips are lower quality than chips obtained from delimbed logs, in terms of: particle size distribution, ash content; storage capacity
• The roadside landing must be large enough to accommodate the chipper, the accompanying chipvan and the stacks to be chipped.
  
• Stacks should not be contaminated during extraction and/or piling
  

• Most chipping operations are conducted at roadside.
• Whole trees are chipped when the quality of the stem (size, form, species) is not suitable for the cost-effective recovery of higher-value products
• in combination with cable yarder

Economic suitability

Example:

• machine costs without personal costs: 200,00 Euro/h
• personal costs per person: 35,00 Euro/h
• number of persons: 1
• in total: 235,00 Euro/h
• regression line minutes per tree
  • b₀ = 0,2
  • b₁ (tree volume) = 1,0

Ecological suitability

Ecogram 

Social suitability

• S-class: chipping on forest road -> S1
• E-class: advanced machine work, moderate -> E4 

Eliasson, L., Von Hofsten, H., Johannesson, T., Spinelli, R., Tierfelder, T., 2015: Effects of sieve size on chipper productivity, fuel consumption and chip size distribution for open drum chippers. Croatian Journal of Forest Engineering 36: 11-17.