Plant biomassalso plays an importan

Plant biomass
also plays an important role in determining soil community
diversity through the regulation of resource availability
(Mikola & Setala, 1998; Degens et al., 2000). Plant-induced
variation in microbial communities appears to vary in effect
between groups of soil organisms (Porazinska et al., 2003),
and seems to be strongest for soil organisms directly interacting
with plant hosts, such as mutualists and pathogens
(Wardle, 2006).