Figure 3

Logarithmic relationships between soil depth (cm) and fine root biomass (t ha ^-1 ) for hybrid poplar (Poplar) and herbaceous (Herb) riparian buffers. Both relationships are significant at p < 0.001. Mean fine root biomass for both land uses at each site and at each depth were used as response variables and mid-points of depth intervals were used as predictor variables. For each relationship n = 12.