Fig. 4From: Understory dynamics after disturbance accelerate succession from spruce to beech-dominated forest—the Siggaboda case studyRelationships between decrease of competition index (−iCI. log transformation) from 2004 to 2011 and relative volume increment (ivr. log transformation) for beech and spruce; only tree specimen measured twice in 2004 and 2011 with positive increment of both diameter (id) and height (ih) are included. Tree species effects on the linear relationships are significant according to an analysis of covariance (ANCOVA, see Table 3)Back to article page