Ecology 6_Student_H-O_Sp'10

Ecology 6_Student_H-O_Sp'10 - 1 Non-equilibrium community...

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2 year 1 2-5 years 5-15 years year 60 year 120 Old field secondary succession in Piedmont of North Carolina successional sequence mature oak-hickory forest (‘climax’) young pine forest Non-equilibrium community dynamics mixed pine/ hardwood forest abandonded field annual weeds - crabgrass, ragweed longer-lived grasses & herbs - broom sedge, goldenrod, aster perennials & shrubs - e.g. blackberry, sumac high-light adapted trees - e.g. sweet gum & esp. pines mature pines with hardwood understory Mature hardwood - oak/hickory - forest Old field succession
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3 Lupine , a nitrogen-fixing legume and early pioneer species pumice plain of blast zone Height (cm.) 0 10 20 control (barren ground) Lupine- conditioned soil Lupine mulch live Lupine Treatment ‘pearly everlasting’ ‘fire weed’
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4 HIGH LOW DIVERSITY ʻ High ʼ ʻ Low ʼ Sources of ‘disturbance Physical land clearing, clear-cutting hurricanes, ice storms geological events excess nutrients fire Biotic Intermediate Disturbance Hypothesis
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Ecology 6_Student_H-O_Sp'10 - 1 Non-equilibrium community...

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