Grasses form a dense network that resist invasion by

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Unformatted text preview: nd Dominated by grasses & herbaceous vegetation - drought & fires prevent forests - root systems of grasses form a dense network that resist invasion by trees - trees often limited to margins of streams Large populations of big roaming herbivores High productivity, fertile soils Temperate forest Moderate, “constant” precipitation (more winter precipitation than grasslands) Fertile soils (accumulate because of winters) Temperate forest - growth season ≥ 4 months - “mild” winter winter more severe or summer drier, poor soils, regular 30-60 year fire cycles Boreal forest (Taiga) “Boreal” = greek for northern; short growing season (< 100 d), long winters; high temp. seasonality; cold & dry; largest biome: 1/3 of Earth’s forested land Boreal forest (Taiga) conifers that tolerate drought, resist freezing damage, adapted to thin, acidic soils low diversity: spruces, pines & larches summer droughts may promote fire Tundra Cold: very short growing season Permafrost (permanently frozen soil); top layer thaws in summer Soil: poor; low rate of decompositio...
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