ENV100H1 Lecture Notes - Lecture 13: Manchineel, Germination, Soil Fertility
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ENV100H1 Full Course Notes
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Disturbance & succession disturbance: removal/ a ect how much plants there are. Volcanoes & glaciers have high disturbance- send communities into primary succession primary succession > secondary succession > climax, steady state. Primary succession barren site no soil no remnant organisms e. g. sand dunes, glaciers, volcanoes recolonization by dispersal. Recolonization by: seed bank vegetative growth- sideways e. g. grasses dispersal. Patterns of succession depend on: environmental conditions pool of potential invaders species interactions dispersal ability remoteness of disturbed site facilitation inhibition (compete against each other) tolerance predators, trophic cascades (direct/indirect a ect of predators) Atmospheric inputs ( xation, dry + wet deposition) main source of p, ca, mg, k e. g. source of n, c from rain, dust, nitrogen xation, carbon xation (photosynthesis) Nitrogen xation cyanobacteria- found in extreme environments e. g. arctic bacteria/fungi. Root nodules -plant bene ts from nitrogen xation on roots.
