Environmental Science 1021F/G Lecture Notes - Lecture 8: Aspen Parkland, Shelterwood Cutting, Clearcutting
20 Mar 2016
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Forests classified by age and structure: old-growth forests (22%) A forest that has had limited disturbance (by humans/natural disasters) Amount is decreasing agrilculture, plantations (palm oil: second growth forests (63%) May have been naturally or planted back. Can see open sky above: tree farms/plantations (5%) Carbon sink: take in co2 and store it. Energy flow and nutrient cycling: energy flows from sun, photosynthesizes, moves through energy chain, detritivores recycle nutrients, would not have life without these services. Erosion protection: roots and physical barriers. Air and water purification: trees filter other things than co2, trees take up water from roots and purify water, evapotranspiration (releasing it as water vapor) Local and regional climate regulation: climate = temperature and precipitation, regulate temperature with shade, reflect heat into the atmosphere. Fuel wood 1/3 of worlds population rely on this as heat source. Most threatened -40% at threat or have been deforested. Second largest forest type: temperate canada. Smallest forest category: boreal (taiga) canada.
