Fig. 5.

Mycorrhizal colonization (%) of first-, second- and third-order roots among species with low (Intolerant), moderate (Moderate) and high (Tolerant) shade tolerance in Sapindaceae, Betulaceae, Fagaceae and Pinaceae. Species are given in Table 1. Mycorrhizal colonization was determined from the proportion of cortical cells colonized by mycorrhizal fungi for arbuscular mycorrhizae or the proportion of cortical cells with Hartig’s network for ectomycorrhizae. Mean square error = 0.79 for mycorrhiza colonization.