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Ecological parameter: LANDOLT vascular plants - reaction Switzerland (Alpine region)

Parameter group: habitat related parameters

Explanation:
The reaction value characterises the content of free H-ions in the soil. Low reaction values indicate acid soils poor in bases, high values correspond to soils rich in bases.

Landolt, E., Bäumler, B., Erhardt, A., Hegg, O., Klötzli, F., Lämmler, W., Nobis, M., Rudmann-Maurer, K., Schweingruber, F.H., Theurillat, J.-P., Urmi, E., Vust, M. & Wohlgemuth, T. (2010): Flora indicativa - Ökologische Zeigerwerte und biologische Kennzeichen zur Flora der Schweiz und der Alpen, 2. Aufl., Haupt Verlag, Bern, Stuttgart, Wien, 378pp.


Classification system: score
A description of the coding system can be found here  Abbreviations/Coding Systems

Abbreviations:
Category name:Abbreviations:Explanation:
11extremely acid, pH 2.5 - 5.5
22acid, pH 3.5 - 6.5
33weakly acid to weakly neutral, pH 4.5 - 7.5
44neutral or alkaline basic, pH 5.5 - 8.5
55alkaline, high pH, pH over 6.5 - 8.5
xxwide range of variation
variationrange of variation regarding the reaction value: I - small variation, II - large variation
Assigned taxa for each higher systematic unit:
TaxagroupNumber of assigned taxa / total number of taxa - percentage
Liliopsida221 / 361 - 61.2%
Lycopsida4 / 12 - 33.3%
Magnoliopsida7 / 20 - 35%
Polypodiopsida11 / 19 - 57.8%
Rosopsida286 / 399 - 71.6%
Sphenopsida8 / 9 - 88.8%