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Long-term heavy grazing bad little effect on root and crown biomass of Indian ricegrass (Oryropsis hymmoiks [Roem. and Scbuit.] Ricker), nor did it signi5cantiy affect the total noastructural carbohydrate (TNC) reserve levels or the seasonal cycle of reserves in this grass. Fifty years of protection from livestock use bad not resulted in ecotypic differentiation In Indian ricegrass for the variables. Cllpplng reduced crown biomam more than root biomass and removal of 90% of the aboveground biomass resulted in more than a 50% reduction in crown biomass and reserve carbohydrate pool. Two commercial shim of Indho ricegrass ('Nezpar' and 'Paloma') were compared with native Cbaco Canyon strains in a uniform garden study. The Nezpar strain was superior to Palomn and tbe Chaco Canyon strains in production of crown biomass and TNC reserve at the more meGc garden site. The native strains from the more arid Chaco Canyon site were superior to both cultivated strrlns ln production of roots. The native Cbaco Canyon strains were little affected by clipping and have promising genetic potential for tolerance of drought and heavy grazing.

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