EcoFoG

 

Influence of the soil on the floristic composition

Data

Contents

For each variety or subspecies, ecological profiles are defined by the effect (positive or negative) of each ecological variable on their occurence frequency according to the following nomenclature:

  • 0 : not significant
  • 1 : - (P < 0.05).
  • 2 : - - (P< 0.01).
  • 3 : - - - (P < 0.001).
  • 4 : + (P < 0.05).
  • 5 : + + (P< 0.01).
  • 6 : + + + (P < 0.001).

Environment variables are:

  • Soil descriptors:
    • Soil1: deep vertical drainage.
    • Soil2: weathered material at less than 1.2m.
    • Soil3: dry character between 1 and 1.2m.
    • Soil4: dry character at less than 1m.
    • Soil5: uphill system.
    • Soil6: uphill system and dry character at less than 1.2m.
    • Soil7: downhill system.
    • Soil8: downhill system and dry character at less than 1.2m.
    • Soil9: surface hydromorphy.
  • Topography:
    • Topo1: lowland.
    • Topo2: foot-slope.
    • Topo3: middle-slope.
    • Topo4: upper-slope.
    • Topo4: flat hilltop.
    • Topo5: ridge.
  • Slope:
    • Pente1: level land (0-5%).
    • Pente2: gentle slope (5-15%).
    • Pente3: steep slope (15-30%).
    • Pente4: very steep slope (>30%).
  • Geological substrate:
    • SubstratGeol1: schist.
    • SubstratGeol2: pegmatie.

MI is the mutual information between the focal species and the descriptor (according to Godron, 1968).


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Last update on 2/28/2011