Fig. 3

Score values before (a–c) and after (d–f) autoscaling transformation representing fine root length obtained by PC1 and PC2 and depicted according to a, d sampling year (2007, 2008), b, e soil depth (0–10, 10–20, 20–30, 0–30 cm), and c, f forest stand (40-year-old coppice--CpS; Conversion to high forest 2004--CvS 04; Conversion to high forest 1994--CvS 94)