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8 <br /> <br />s <br />• <br />300 <br />250 <br />n <br />y~ 200 <br />N <br />E <br />m 150 <br />0 <br />m ,00 <br />m <br />a <br />a <br />50 <br />0 <br />® Pvmnlal Grasw_v • <br />•n <br />Pcennial Forts <br />o <br />b <br />D <br />• • f <br />15 30 45 60 <br />Topsoil Depth (cm) <br />Figure 1. Mean biomass of perennial grasses and forbs on four soil <br />depths, ten years after seeding, Different letters <br />represent significant differences across topsoil depths <br />(p50.05). <br />