Figure 6
From: Forest soil carbon is threatened by intensive biomass harvesting
Effect of intensive harvest on C stocks in the forest floor (F), top soil (T) and mid soil (M) related to Köppen climate classes.
(A) forest floor (all sites or selected sites (time elapsed since harvesting <10 years)); (B) top soil; (C) mid soil (all sites). Means ± standard errors. Values are expressed as relative responses [log(whole-tree harvest/stem-only harvest)]. For the sake of clarity, comparisons between treatments and controls are also presented as the mean arithmetic difference (% higher or lower). Number of sites ranged from 7 to 23 (insufficient data for tropical climates). Significant differences between relative responses and value 0 are denoted by an asterisk (t test). There were also significant differences among classes (ANOVA, P = 0.040 for the mid soil, P = 0.078 for the forest floor with selected sites (0–10 years)).
