Table 1 List and description of the environmental variables and Ellenberg indicator values
Code of variable | Description and source | Type |
|---|---|---|
Characteristics of a log | ||
TreeCover | This was estimated visually based on the following scale: (1—30% of canopy cover; 2—30–40%; 3—40–60%; 4—60–80%; 5—> 80%) | Ordinal (1–5) |
Adherence | Degree of adherence of a log to the forest floor (%) | Interval |
Decomposition | Decomposition class of a log based on an eight-degree scale (Holeksa 2001) | Ordinal (1–8) |
Area | Area of a log surface (m2), which was calculated using the formula for a truncated cone | Interval |
BarkCover | Cover of bark on a log (%) | Interval |
Length | Length of a log (m) | Interval |
Moisture | 1—dry, completely dry to the touch; 2—intermediate, slightly perceptible moisture to the touch; 3—moist, water flows when pressure is applied | Ordinal (1–3) |
SPRUCE | Species identity of a log (1—spruce, 0—not a spruce) | Binary (0,1) |
Climatic factors | ||
ELEVINDEX | Value combined elevation (m a.s.l.), slope aspect and slope inclination (Ewald 2009) | Interval |
PADIR | Potential annual direct incident radiation (McCune and Keon 2002) | Interval |
AHL | Approximated heat load: ln(RAD, MJ × cm−2 × year−1) rescaled and folded about the NE = SW line (McCune, Keon 2002 | Interval |
Ellenberg indicator values (Ellenberg and Leuschner 2010) | ||
L | Light | Ordinal (1–9) |
T | Temperature | Ordinal (1–9) |
F | Moisture | Ordinal (1–12) |
R | Substrate reaction; acidity | Ordinal (1–9) |
N | Nitrogen; nutritition | Ordinal (1–9) |