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• • <br />Table 6. Hean aboveground biomass (g/mz) of dominant seeded herbaceous species in 1983, 1985, and 1990 on four <br />topsoil depths. Values within a topsoil depth and among years followed by different letters <br />are significantly different (P<0.05). <br /> 1983 1985 1990 <br />Species 15 cm 30 cm 45 cm 60 cm 15 cm 30 cm 45 cm 60 cm 15 cm 30 cm 45 cm 60 cm <br />Perennial Grasses <br />Agropyron criatatum 15a 18a 20a 30a Sa 12a 22a 23a 15a 14a lla 23a <br />Agropyron intermediuro lOSa 76a 92a 100a 110a 107b 127b 131b 20b 18c 14c 29c <br />Agropyron emithii 31a 33ab 28a 39a 31a 54a 76b 78d 33a 27b 20a 17a <br />Agropyron spicatum 5a ea 5a 6a 4a 3a 4a 2a 2a 2a 2a 0.6b <br />Bromus inermis 18a 20a 26a 41a 16a 51b 45a 6Ba 89b 94c 102b 157b <br />Elymus cinereus 3a 6a 6a 4a 13b 23b 13a 22b 28c 43c 95b SOc <br />Poe pratensia 4a 4a 3a 4a 12b 21b l0a 9a 17b llab Ba 2a <br />Stipa viriduIa 4a 6a 5a 7a 4a 7a 8a 6a 4a 6a Sa 7a <br />Perennial Forbe <br />Astrega2us ricer 15a 7a 5a 9a 85b 36b 22b 3a 62b 28b 1Bb Sa <br />Sangutaorba minor O.Ba D.Sa 0.7a O.le la O.ln O.la O.ls Oa Oa Da Oa <br />