EIV L: Light indicator value (Lichtzahl)

1 – Plants of deep shade
2 – Species intermediate between 1 and 3
3 – Shade plants, mostly <5% relative illumination
4 – Species intermediate between 3 and 5
5 – Semi-shade plants, >10% relative illumination, but seldom in full light
6 – Species intermediate between 5 and 7
7 – Plants of well-lit habitats tolerating partial shade
8 – High-light plants, seldom occurring at <40% relative illumination
9 – Plants of full light, occurring mostly in full sun

EIV T: Temperature indicator value (Temperaturzahl)

1 – Cold-demanding species – Only in high mountains, species of the alpine and nival zone 
2 – Cold- and cool-demanding species – Species with intermediate temperature demand between category 1 and 3 (many alpine species)
3 – Cool-demanding species – Mostly species of the subalpine zone
4 – Cool-demanding and moderately heat-demanding species – Species with intermediate temperature demand between category 3 and 5 (mostly species of mountains)
5 – Moderately heat-demanding species – (mostly species of submontane and temperate areas)
6 – Moderately heat-demanding–heat-demanding species – Species with intermediate temperature demand between category 5 and 7 (species from lowlands to the colline zone)
7 – Heat-demanding species – In northern Central Europe only in relatively warm lowlands 
8 – Heat-demanding–Extremely heat-demanding species – Species with intermediate temperature demand between category 7 and 9 (mostly species with a temperate or submediterranean distribution)
9 – Extremely heat-demanding species ­– Species with a Mediterranean distribution (in Central Europe only in the hottest places) 

EIV K: Continentality indicator value (Kontinentalitätszahl)

1 – Euoceanic species – Only occasionally occurring in Central Europe (CE) (species of Southern and Western Europe)
2 – Atlantic (oceanic) species – Mainly in Western Europe and in the western part of CE
3 – Atlantic–subatlantic species – Species intermediate between category 2 and 4 (species distributed throughout most of CE)
4 – Subatlantic (suboceanic) species – Species with a center of distribution in CE
5 – Intermediate species with slight suboceanic-subcontinental character
6 – Subcontinental species – Species with a center of distribution in eastern CE
7 – Subcontinental–continental species – Species intermediate between category 6 and 8 
8 – Continental species – Species reaching only the eastern part of CE
9 – Eucontinental species – Species with a center of distribution in and Eastern Europe

EIV F: Soil moisture indicator value (Feuchtezahl) (1–12)

1 – Species of extremely dry habitats, on soils that often dry out completely
2 – Species intermediate between 1 and 3
3 – Species indicating dry habitats, occurring mostly in dry soils
4 – Species intermediate between 3 and 5
5 – Species indicating soil moisture, mostly on soils with average water content
6 – Species intermediate between 5 and 7
7 – Species of constantly moist but not wet soils
8 – Species intermediate between 7 and 9
9 – Species indicating high soil moisture, mostly occurring on water-saturated soils
10 – Species of shallow-water habitats that may lack standing water in some periods of the year
11 – Species that root underwater and are either floating on the water surface or partially emerge above the surface
12 – Submerged plants that permanently live underwater 

EIV R: Soil reaction indicator value (Reaktionszahl) (1–9)

1 – Species indicating extreme acidity, always found on acidic soils
2 – Species intermediate between 1 and 3
3 – Species indicating acidity but sometimes occurring on nearly neutral soil
4 – Species intermediate between 3 and 5
5 – Species indicating slightly acidic soils, rarely occurring in highly acidic soils
6 – Intermediate species between 5 and 7
7 – Species indicating slightly basic soils, never occurring in highly acidic habitats
8 – Intermediate species between 7 and 9
9 – Species indicating basic conditions, always found on calcareous and other basic soils

EIV N: Nutrient availability indicator value (Nährstoffzahl) (1–9)

1 – Species indicating soil with extremely low nutrient availability
2 – Species intermediate between 1 and 3
3 – Species of moderately infertile soils
4 – Species intermediate between 3 and 5
5 – Species indicating intermediate soil fertility
6 – Species intermediate between 5 and 7
7 – Species of habitats with mostly high fertility
8 – Species intermediate between 7 and 9
9 – Species indicating extremely rich soils

EIV S: Salt content indicator value (Salzzahl) (0–9)

0 – Species absent from saline soils
1 – Slightly salt-tolerant species able to persist in the presence of salt
2 – Species occurring in both saline and non-saline soils
3 – Species of mostly saline, coastal habitats that also occur on non-saline soils
4 – Species occurring in habitats with moderately saline soils, salt meadows and upper salt marshes
5 – Species of saline habitats, such as cliffs receiving salt spray
6 – Species of mostly highly saline habitats, salt marshes 
7 – Species of highly saline soils of lower salt marshes
8 – Species of soils mostly inundated by sea water 
9 – Species of extremely saline conditions, where sea water evaporates and precipitates salt
 

Data source and citation:

H. Ellenberg u. a.: Zeigerwerte von Pflanzen in Mitteleuropa. 3., erweit. Aufl. Goltze, Göttingen. 2001, 262 pp.

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