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Lecture 18

BOT 1200 Lecture 18: Lecture 18

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University of Guelph
BOT 1200
Gale Bozzo

Lecture 18- Wood and Wood Products  Defintion of a tree & record breaking trees  Making a tree- the botany of how it grows  Different uses for different woods  Good vibrations Church of the Transfiguration (built in 1781) Turchasovo region Wood is produced primarily from trees  What is the difference between a tree, a bush, and a shrub?  A tree is woody, more or less erect, usually single stemmed and may exceed 6m in height  Oak Tree  Dogwood shrub  Bittersweet vine Trees are Vascular plants  Trees are ancient in origin; have been on the planet longer than animals  Dominant vegetation since the Carboniferous period (265-295 million years ago)  Cone bearing plants (gymnosperms) evolved first. Angiosperms (flowering plants) arose 100 million years ago  Today, there are 700 conifer species and about 30,000 species of flowering tree Record Breaking Trees The 5 largest tree in the world at 72.8 m tall and 7.8 m in diameter Tallest tree is a coast redwood (Sequoia sempervirens) in California, standing at 112.2m Some Trees are thousands of years old  Bristlecone pines (Pinus aristata and P. Longaeva) in California and Nevada are some of the oldest trees Some Trees are thousands of Years old  Ancient yews of England are found on ancient burial sites dating from Neolithic to Saxon periods How does a tree grow?  To have a tree which grows in “girth” , a plant must be capable of producing “secondary growth”  Secondary growth occurs in woody angiosperms and in gymnosperms Bamboo and Banana are not Trees  No secondary growth in monocotyledonous plants  The lateral meristerm vascular cambium is required for secondary growth Woody Stems require a vascular Cambium  Wood is a combination of xylem vessels, tracheids, fibers and parenchyma  One year’s growth: late wood & early wood  Vascualr rays  Heartwood  Wood (secondary xylem)  Inner Bark (Secondary phloem) Deciphering Tree Rings  Dendrochronology is the study of tree rings  Rings in living trees are matched with those in fallen trees to produce a record dating back thousands of years Tree ring patterns are indicative of climate change  Dendroclimatology is used to determine if droughts occurred in cyclic patterns  An indicator of the impact of pollution, pests, forest fires, volcanoes, and earthquakes on forest trees Wood makes for a good meal? What makes wood hard?  Wood hardness relates to sturdiness
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