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Table 1 Assignment of N availability levels according to VDI Guideline 3959 Part 1 [41] and the C/N ratios in the topsoil for the nutrient cycle types of the reference states for forest ecosystems according to Jenssen et al. [23]

From: Reference states of forest ecosystem types and feasibility of biocenotic indication of ecological soil condition as part of ecosystem integrity and services assessment

Parameter Category
N-availability “appraisal” Very low “dystrophic” Low “oligotrophic” Medium “mesotrophic” High “eutrophic” Very high “very eutrophic”
Ellenberg–N score  < 3.4 3.4–4.3 4.4–5.3 5.4–6.1 > 6.1
Humus form Raw humus, meager Raw humus, meager Raw humus Moder-raw humus/raw humus-moder Moder Brown- mull Mull Calcareous mull
Nutrient cycle type A1 A2 B1 B2/C1 C2 D1 E1 E2
C/N > 33 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 < 11