Table 2. Effects of phylogenetic isolation aboveground and belowground (PIA + PIB) on decomposition of oak litter, i.e. mass loss, carbon loss and nitrogen loss, based on multiple regression analyses, which involved the soil biota as predictive co-variables, as well as their interaction terms with PIA and PIB. * p < 0.05; ** p <0.01; *** p < 0.001. Residual degree of freedom ranged from 27 to 36. r-square and the adjusted r-square (adjr2) for each model were listed in the table.