Textbook Notes (369,133)
Canada (162,403)
Biology (1,183)
Chapter

N14__

3 Pages
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Department
Biology
Course Code
Biology 2217B
Professor
Richard Gardiner

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Tut 2 Primary growth comes from apical meristem ­ pith in the center, heartwood, sapwood ­ radial – is along rays Human dependence ­ climate regulation, oxygen ­ habitat ­ recreation ­ natural resources ­ timber, ­ fuel Paleobotonay – use growth rings on tree to date them ­ scientific data achieved from tree ring record ­ past weather conditions, climate, natural disasters, pollution ­ fraud investigation, illegal logging ­ the wider the growth ring the wetter the year ­ Russia and brazil (1,2 for forests) ­ ONTARIO: tundra, boreol barrens, boreal forest, mixed forest, and deciduous  forest ­ 95% of Ontario has been deforested, major affects on biodiversity o Biodiversity indicates the health of an ecosystem – decrease in detrimental o Areas closer to equator have greater diversity, poles have a lot less ­ types of cuts: plain saw, rift saw, quarter saw o plain saw used for wood board flooring o 2  two have a lot of left over o rift has most uniform cuts ­ logging techniques: o Clear cutting – most invasive and destructive, still common (trees not  replaced) o Seed tree cutting – keeps best trees for seed production (helps regeneration  but still a lot lost) o Shelter wood cutting –  o Selective cutting – takes a lot of planning, cut trees that are about to die ­ Global forest assessment – o Extent of forest resources o Biological diversity o Forest health and vitality ­ ­ Forests cover 30% of land mass o 4 billion Ha o 64 countries have less that .1 Ha o Total area decreasing o Rate is slowing o Mostly 
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