Environmental Science 1021F/G Lecture Notes - Lecture 7: Clearcutting, Sustainable Agriculture, Heracleum Mantegazzianum

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Managing and sustaining forests: forests classified by age and structure, old-growth forests (22%, second-growth forests (63%, tree farms/plantations (5%) Ecological services of forests carbon sink: energy flow and nutrient cycling, erosion and disturbance protection, air and water purification, water control, local and regional climate regulation, habitat and food for wildlife. 50% planted with spruce (picea abies) monoculture (1930s): flattened: massive windstorm swept through tatra national park, other 50%: high biodiversity, not damaged, replanting plans: increased biodiversity; no more monocultures. Deforestation affects us in ways we would never have previously imagined: mangroves: woody, specialized tropical trees; found where rainforests meet oceans, mangrove forest provided natural buffer to villages in indonesia and samoa from tsunamis. Economic services of forests: fuel wood, lumber, paper, livestock grazing, recreation, other resources (minerals, medicine, food) Forest types of the world: classified by climate. Canada"s forest regions: boreal - largest, taiga, aspen parkland, subalpine, montane, coastal, columbia, carolinian, great-lakes st. lawrence, acadian.

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