Fig. 5From: Effects of Hedera helix L. removal on the understory early regeneration in an oak temperate forest in Mexico CityCanonical correspondence analysis (CCA) for the soil environmental factors and the species found. Plots invaded by H. helix (IH); control plots without H. helix (CV); invaded plots where H. helix was removed (IR); and control plots without H. helix where we manually removed the understory (CR). Axis 1 eigenvalue = 0.17; axis 2 eigenvalue = 0.12. E.C. = soil electrical conductivity, P = soil phosphorus, K = soil potassium, O.M. = soil organic matter, N = soil nitrogen (see Additional file 1: Appendix)Back to article page