“…To address the question whether tree richness or the mixing of AM and EM tree species results in higher effects at the ecosystem level, the tree diversity experiment "MyDiv" was established (Ferlian et al, 2018). Here tree diversity (one, two, and four tree Ac Acer pseudoplatanus L. Sapindaceae AM (Harley & Harley, 1987, 1990Lang et al, 2011;Pirazzi et al, 1999;Ruckli et al, 2014;Weber & Claus, 2000) 56 Oleaceae AM (Beyer et al, 2013;Cesarz et al, 2013;Harley & Harley, 1987;Kubisch et al, 2016;Pirazzi et al, 1999;Weber & Claus, 2000) 45.20 Betulaceae EM (Brun et al, 1995;Brundrett, 2009;Cuvelier, 1990;Harley & Harley, 1987, 1990Wright et al, 2005) 41 Betulaceae EM (Brundrett, 2009;Harley & Harley, 1987, 1990Lang et al, 2011;Rewald et al, 2014;…”