FRST 100 Study Guide - Midterm Guide: Food Web, Certified Wood, Ericaceae
Document Summary
3. 8 billion ha - 1//3 of world"s land area (which is not covered with ice): what do we mean we refer to the natural climax vegetation . A perennial woody plant characterized by one main stem or trunk bearing a more or less distinct and elevated crown of branches. To which group does douglas fir belong: angiosperms, enclosed seeds, flowering plants, gymnosperms, naked seed plants, or cone bearers (conifers). Because they have long, severe winters and short, cool summers with only 50-100 frost-free days. Precipitation is low (400-500mm) and falls largely as snow (available soil moisture is high though). Breakdown of organic matter and nutrient release is slow and the forest floor is covered by deep organic litter. Stands in the boreal are also fairly uniform in terms of age (large areas of even-aged forest), height and diameter distribution. Low growth rates (1-1. 5 m3/ha/annum) resulting in very long rotations.
