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17 <br /> <br />16 <br />14 <br />m 12 <br />U <br />N <br />~ 10 <br />w <br />0 8 <br />• ~ <br />.Q 6 <br />G <br />Z 4 <br />0 <br />a <br /> <br />2 <br /> <br />4 <br />15 30 45 60 <br />Topsoil Depth (cm) <br />Figure 5. Mean number of species across four topsoil depths, ten <br />years after seeding. Different letters represent <br />• significant differences across topsoil depths (p50.o5). <br />