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19 <br /> <br />• <br /> <br />400 <br />350 <br />~ 300 <br />y <br />N <br />c9 <br />~ 250 <br />O <br />m <br />~ 200 <br />C <br />~ 150 <br />d <br />.p 100 <br />Q <br />50 <br />0 <br />81 85 90 81 85 90 81 85 90 81 85 90 <br />15 cm 30 cm 45 cm 60 cm <br />Topsoil Depth By Year <br />Figure 6. Aboveground mean biomass of perennial grasses, perennial <br />forbs, and annuals from 1981-1990 on four soil depths. <br />Different letters indicate significant differences across <br />soil depths and within lifeforms (p<_0.05). <br />