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Wood (Wood Structure (Sapwood (Transports sap from roots to leaves where…
Wood
Wood Structure
Outer Bark
Provides protection, very thin for some species ie Poplar, thick for others, i.e. Douglas Fir
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Cambium
Thin layer of tissue between bark and wood. Location of wood growth by forming new cells, produces new growth in the girth of tree. Produces inner bark on the outside, sapwood on the inside
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Heartwood
Inner non-living core with a dark colour; drier and harder, more resistant to decay than sapwood
Growth rings
Exogenous trees (Decidious/Coniferous) grow with the addition of new rings outwards, creating annual growth rings
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In softwoods, latewood has smaller diameter tracheids
In softwoods, Tracheids have larger diameters
Microstructure
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Cells
Tracheids
Circular bordered pits, allow transfer of sap between longitudinal cells
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Vessels
Transport sap in hardwoods, short and wide cells that form an efficient conducting tube when placed on top of each other
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Classification of Wood
Softwood
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Douglas Fir, Spruce, Pine, Hemlock, Western Red Cedar
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