Fig. 9From: A field experimental study on the impact of Acer platanoides, an urban tree invader, on forest ecosystem processes in North AmericaRelative height growth of Norway maple (a, c) and red maple (b, d) seedlings over canopy openness (%) and under three canopies with intact canopies (striped or solid bars) and newly created gaps (open bars). The graph shows means ± 1 SDBack to article page