Dendro_1_Biome_1_2_2009

Dendro_1_Biome_1_2_2009 - Geog 102 Tree Rings No Text...

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Geog 102 – Tree Rings No Text Readings Outline: Dendrochronology Introduction Tricks of the trade Environmental history Tree rings and climate Old-growth forests Forest stand development Forest fires and mountain pine beetles What is a Tree Ring? Tropical Tree Rings? How old is this tree? Tricks of the trade: crossdating Samples taken from living trees and dead wood are matched using over-lapping ring patterns. This method allows us to date rings from prehistoric periods.
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Ring width varies with: Tree age Climate Disturbance Fires Insects Wind storms People Stand Dynamics Prometheus Tree – Tree rings and Climate Complacent series Sensitive series
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Variations with Age and Environment: Pioneer species (shade intolerant) vs later-successional (shade tolerant) species Example, Douglas Fir and Western Red Cedar Fire History in the Cariboo:
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BIOMES 1 New Version: Ch 20, 671-75 Old Version: Ch 20, p 667-72 BIOMES - largest division of terrestrial ecosystems, subdivided into formations - regional-scale ecosystems, strongly related to climate and soils A. BIOMES AND VEGETATION - life-forms of the dominant vegetation describes each biome Life forms = mode of existence, physical size and structure a. mode of existence: - annual (A) = 1 life cycle in 1 growing season - seed germinates, plant grows, reproduces and dies - perennial (P) - lives > 1 growing season, reproduces more than once b. growth forms - size, structure and shape: Growth Form Mode of Existence
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Dendro_1_Biome_1_2_2009 - Geog 102 Tree Rings No Text...

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