grasslands
DESCRIPTION
this is a powerpoint presentation on grasslands.TRANSCRIPT
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The Grasslands consist of two parts, the tropical and the temperate Grasslands:
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Tropical Grassland-Savanna-
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Climate
• Temperature– 20o-30o Celsius
• Average Rainfall– 100-400 mm per year (80% in wet season)
• Sunlight
• Lots of sun during dry season• Grasses are mostly C4
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Soil Fertility
• Soil Fertility– Sandy, dusty, high iron
content (reddish color) Not very rich
– Termites turn the soil to air it
– Dead plant matter can’t decompose in dry season
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Seasonal Changes
• Wet– 4-5 months– Equatorial low pressure belt– Heavy convectional storms
• 80% total annual rainfall
• Dry– Strong, steady “trade winds”
• Dry and warm as they blow towards equator
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Characteristics
• Vegetation– 100-200 mm rainfall-only grasses– 300 mm rainfall-shrubs– < 300 mm rainfall-solitary trees– < 400 mm rainfall- trees, canopy, shade
• Trees-deciduous-lose leaves in winter
• Shrubs/Grasses-C4
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Temperate Grasslands
• Prairies, (N. Am. [Great Plains, Palouse, California])
• Steppes (Russia - Ukraine [Hungary-Rumania])
• Pampas (Argentina - Uruguay)
• Veldt (S. Africa); NZ tussock grasslands
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Temperate grasslands
prairies, steppes, pampas, veldt…..
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Temperate grasslands
• Prairies and steppes have continental climates characterised by large annual range of temperature, cool - cold winters, with most of precipitation as snow, and hot, commonly droughty summers because of high evapotranspiration rates.
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North American grasslands
Abilene
Calgary
CheyenneOmaha
Chicago
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Palouse prairie
Eastern Washington, and Oregon, Idaho
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California grasslands
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