Wood
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Wood is used as
fuel for cooking and heating
Found in
developing countries
what percentage of fuel comes from wood or plant biomass in developing countries
50-90%
process by which wood is used to generate electricity:
• wood dried • undergoes pyrolysis (heating in the absence of oxygen) • gases are purified and burnt to generate electricity
ash can be used as what?
plant fertilizer
Wood Harvesting Systems
Some use the whole tree for chipping; others utilize only the stem wood
Short-rotation forestry
fast-growing trees are cultivated and grow until they reach what is considered an economically optimum size - time varies depending on the species - trees are then either harvested or copposed
Harvesting
completely cutting down trees; replacing with saplings
Coppicing
young stems cut backt o encourage new stems to grow from the “coppice stool”; this can help increase levels of CO2 uptake (carbon sequestration)
Auxins
plant-growth regulators; produced on the very tip of shoot and prevent side shoots from growing -if main shoot is damaged or cut off, auxin production is removed so side shoots will grow -coppiced side shoots will grow traight up to try and reach the light
Short-rotation coppice trees:
willow and poplar; fast-growing, coppice every 3-5 years