15herb - BIO 20 HERB 1 HERBACEOUS ECOSYSTEMS 1A. GRASSLANDS...

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BIO 20 HERB 1 HERBACEOUS ECOSYSTEMS 1A. GRASSLANDS grasslands - once 42% land, now 12% - temperate zone, open wind-swept plains - incl. N.Am. prairies, S.Am. pampas, Eur. steppes, s.Afr. veldt - Afr. savanna includes scattered trees seasons - bright sun, high winds - harsh rainy winter, hot dry summer - brief equinoxes, rainfall 250-800 mm - evaporation exceeds precipitation soil - soggy in spring, parched by summer few trees-shrubs - saplings drowned grasses - non-woody, herbaceous - growing season during mild spring - half+ underground to survive fires - blade (narrow leaf maximize light, clipped by grazing animals) - rhizome (underground stem/storage, propagate horizontally, not clipped) - fibrous roots (shallow, no taproot) animals - worms fertilize soil - large termite & ant mounds in savanna - small burrowers, large hoofed grazers 1C. GRASSLAND ECOLOGY succession - seral, not shade-tolerant, poor roots replaced by shrubs-trees) - fire eliminates woody saplings,
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This note was uploaded on 08/12/2010 for the course BIO 20 taught by Professor Hom during the Spring '08 term at City College of San Francisco.

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15herb - BIO 20 HERB 1 HERBACEOUS ECOSYSTEMS 1A. GRASSLANDS...

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