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. Author manuscript; available in PMC: 2021 Jul 1.
Published in final edited form as: New Phytol. 2021 May 20;231(2):777–790. doi: 10.1111/nph.17421

Fig. 4. Relationship between the fertility index of a beech dominated mountain forest and.

Fig. 4

(a) mean residence time (MRT) of the organic layer, (b) microbial respiration and the potential activity of (c) phenol oxidase, (d) ß-glucosidase, (e) cellobiohydrolase, (f) ß-xylosidase, (g) N-acetyl-glucosaminidase, (h) leucine aminopeptidase, and (i) acid phosphatase in the mineral soil (0-10 cm). The fertility index is based on the first axis of a principal component analysis of Ellenberg indicator values for vascular plants at sampling plots (Supporting Information Fig. S2). Given are test statistics of linear regression models (n = 16). Solid and dashed lines show fitted models and 95% confidence intervals, respectively.