GEOG 108 Lecture 30.docx

GEOG 108 Lecture 30.docx - GEOG 108 Abandoned Field to Oak...

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GEOG 108 - Nov 23, 2018 - Abandoned Field to Oak Forest o Earliest study of plant succession was done by Dwight Billings in the 1930’s o He examined the re-colonization of natural vegetation on abandoned farms in north Carolina o Examined fields deserted just a few years to a maximum of about 150 years o First stages pioneering colonization of annual plant species on bare ground and nutrient poor soils o Annuals were quickly replaces following year by biennial plants and grasses o After about 3-4 years, perennial herbs and shrubs took over o These plants live for many years and have the ability to reproduce several times over their life spans o After about 5-15 years, the sites were then colonized by a number of different softwood tree species o Maturing softwoods produce forest canopy with time o Canopy shades ground and light loving perennials die out and are replaced by shade loving plants
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o Development of a soil litter layer, slows for the germination of hardwood species, like oak and various species of hickory o Seedlings of these species tolerate low light levels o Hardwoods started to replace the softwood species by 50-75 years o Oak and hickory can love for more than 100 years o Sites more than 100 years old dominated by mature oak forests - Types of Plant Succession o Primary succession – plants establishing themselves on previously unoccupied habitat o Secondary succession – plants establishing themselves on previously occupied habitat
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o Allogenic succession – succession controlled by a change in environmental conditions o Autogenic succession – succession controlled by establishing species which then cause a
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  • Fall '19
  • Ecological succession, major biomes

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