16dry - BIO 20 DRY 1 DRY ECOSYSTEMS 1A. SCRUB scrub -...

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BIO 20 DRY 1 DRY ECOSYSTEMS 1A. SCRUB scrub - arid-semiarid temperate regions - chaparral in western US, also Chile, Mediterranean, S.Africa, Australia Mediterranean climate - cool moist winter (Calif. 400 mm) - short grow season after winter rains - hot dry summer (1+ months drought) soil - low in nutrients (N + P) - dry in summer sclerophyll vegetation - shrubs & dwarfed trees (12-18 feet) - rapid growth in spring - dense branching, no central trunk - deep roots (most tissue below ground) - leaves small, thick, waxy, evergreen, contain oils that promote fire - also allelopathy to inhibit neighbors animals - mice, jackrabbits, coyote, deer 1C. SCRUB ECOLOGY succession - subclimax, too dry for grasslands - maintain by fire or human disturbance, otherwise forest in 15-20 years - periodic fire recycles, germinates seeds decomposition - slower than grassland - dry, inhibited by allelopathy humans - agriculture & cattle grazing - urbanization
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BIO 20 DRY 2 2A. DESERTS deserts - 26% land surface, all continents
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16dry - BIO 20 DRY 1 DRY ECOSYSTEMS 1A. SCRUB scrub -...

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