Impact of mountain roads on mycorrhizal types
At the global scale, the percentage of vegetation cover associated with
AM fungi was higher on average in plots following the roadsides
(roadside plots) than in the adjacent plots away from the roadside
(adjacent plots) (Table 1, Fig. 2). Conversely, the proportion of EcM
and ErM vegetation cover was lower on average in the roadside plots. In
general, the proportion of EcM and ErM vegetation cover behaved in an
opposite manner to that of AM plant cover where increased levels of AM
vegetation cover corresponded to decreased levels of EcM and ErM
vegetation cover and vice-versa. NM vegetation cover did not
significantly differ between the two environments (Table 1). All the
patterns we describe regarding soil temperature remained the same when
using elevation instead as the environmental explanatory variable (Table
S1).