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Cards In This Set
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Define an ecosystem
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-sum of total vegetation, animals, and physical environment-depends on spatial definition-interaction between living organisms and the physical world.
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What are the 2 main components of an ecosystem?
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1) vegetation2) soils(products of climate, organisms, topography, parent material, and time)
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What is the most important determinant of the nature of terrestrial ecosystems? How is it expressed?
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1) Climate
2) Statistics surrounding temperature and precipitation |
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How is climate classified using the BEC system? Why?
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1) By using zonal ecosystem concept2) Because climate data are lacking in certain areas and cannot produce practical ecosystem classification -(a reliable link between climate and ecosystems is needed)
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What regions are used to characterize BEC units?
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Zonal ecosystems because they are characteristic of the regional climate
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How do ecosystems arrive at climax?
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Through ecological succession.
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Who developed the BEC system in BC?
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Dr. V. J. Krajina
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What are the 3 levels of integration in the BEC system?
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-regional-local-chronological
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What are the 3 regional levels?
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-climate-vegetation-site
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What determines the southern edge of the boreal forest?
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-when hardwoods are a relatively minor forest component~50-60 degrees latitude
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Name 4 forested biomes
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1) boreal2) temperate coniferous3) mangrove4) tropical and subtropical coniferous
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What was Egler's view of ecosystems?
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-individualistic view-along the lines of initial floristics
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Name 3 examples of physiognomic classification systems
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1) USDA world biomes2) UNESCO3) International world vegetation classification
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What are some uses of the physiognomic method?
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-Determine world crop potential-Determine centers of crop origin and thereby create targets for breeding programs
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What tool is used to measure site productivity in stands <50 years old
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-growth intercept model
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