Fig. 4

Principal component analyses (PCA) for carbon content (t C ha⁻¹) considering different forest treatments: A primary forest (PF) and retention types (AG: aggregated retention, DR: dispersed retention), and B PF and retention types at different years-after-harvesting (2 to 18). Acronyms are shown in Table 1. Importance of each PCA component (Axis 1 and Axis 2) is detailed in Additional file 1: Appendix 5