Fig. 2
From: Warming and elevated nitrogen deposition accelerate the invasion process of Solidago canadensis L.
Growth and changed competitiveness of Solidago canadensis at differing degrees of invasion. Ecological traits show different patterns of response to the gradient of invasion (25–100% invasion levels), which displayed linear or non-linear relationships. Solid lines represent significant linear or non-linear fits, dashed lines represent non-significant linear or non-linear fits, and vertical dotted lines indicate the breakpoints identified via piecewise regressions. Error bars represent the SEs of the means (N = 70)