HW30 - CEE300/TAM324 HW30 a o Softwood Three complete...

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CEE300/TAM324 HW30 a. o Softwood – Three complete growth rings can be seen Earlywood: larger size cells Consists mainly of long, thin walled tubular cells called tracheids The length of a longitudinal tracheid is about 3 to 5 mm and its diameter is about 20-80 micrometer The longitudinal tracheids constitute about 90% volume of the softwood The large open space in the centre of the cell is called the lumen and is used for water conduction The earlywood cells have a relatively larger diameter thin walls and a large size lumen The latewood cells have a smaller diameter and thick walls with a smaller lumen Wood rays which run in the transverse directions from the bark to the center of the tree consist of an aggregate of small parenchyma cells that are bricklike in shape and which are use for food storage o Hardwood – Have large diameter vessels for the conduction of fluids The vessels are thin walled structures consisting of individual elements called vessel elements and are used to form in the longitudinal direction of the tree
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Unformatted text preview: stem The wood oF hardwood trees is classi³ed as either ring-porous oF di´use-porous depending on how the vessels are arranged in the growth rings. In a ring-porous hardwood the vessels Formed in the earlywood are larger than those Formed in the latewood In a di´use-porous hardwood, the vessel diameters are essen±ally the same throughout all the growth rings The longitudinal cells in the hardwood tree stem are ³bers These are elongated cells with close pointed ends and are usually thick walled Length of this Fbers are about .7 to 3 mm and average diameter is 20 micrometer The food storage cells of hardwood are the ray (transverse) and longitudinal parenchyma which are brick or box shaped The rays of hardwoods are usually much larger than for so±wood, having many cells across their width. b. i. length of the Fbers ii. large diameter vessels iii. direc²on of the wood rays...
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  • Fall '07
  • Popovics
  • large diameter vessels, larger size cells

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