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).