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Douglas fir

Hansol Yu 74000092 4C
by

Hansol Yu

on 14 April 2010

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Transcript of Douglas fir


Hansol Yu
74000092
4C Geographical Distribution Coastal: occurs along the southern mainland coast and across Vancouver Island, except for the northern tip
Interior: occurs throughout southern British Columbia and north to Calgary, Alberta Abiotic Factors and Habitat for Douglas Fir Abiotic Factors
Mild temparature, abundant precipitation during fall, winter, and spring and acidic soil
Habitat
Coastal: grows in nearly all forest types
Interior: grows in different habitats including open forests with pinegrass and mosses beneath
Physical Attribution of Douglas Fir Two types of Douglas fir - coastal and interior (Rocky Mountain)
Coastal: a large tree and reaches heights of 85 m
Interior: 42 m
Needles, cones, bark Ecology Interior Douglas Fir Coastal: shade-intolerant and advantage over less drought- and fire-tolerant species
Interior: shade-tolerant and fire-intolerant, and severely affected by climatic variation and selective logging Biotic interactions Mutualism and Competition
Grows with western redcedar, hemlock, and grand fir, with a lush layer of salal, huckleberries, Oregon-grape, and sword fern beneath
Predation
Many animals eat Douglas-fir seeds, including squirrels, chipmunks, mice, shrews, winter wrens, and crossbills and bears often scrape off the bark on young trees and eat the sap layer beneath
Reproductive Biology Coastal: mature female seed cones are produced in spring, green at first, maturing orange-brown in the fall 6–7 months later; male (pollen) cones are yellow and dispersed in spring
Interior: male (pollen) cones develop over 1 year and wind-dispersed pollen is released for several weeks in the spring; mature female seed cones are produced annually except for about 1 year in any 4-to-5-year period Coastal Douglas Fir Douglas Fir
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