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The relationship between live and dead biomass of blue grama and acetone extractable pigments was determined to assess its utility in predicting live and dead proportions of a mixed sample. We found the technique to be useful and recommend its use when exact separation is not required. Biomass dynamics of blue grama do not usually fit a parabolic model. Much of the variability in live biomass of blue grama can be explained by rainfall pattern during the growing season. The shortgrass steppe from southeastern Wyoming and western Nebraska to southern New Mexico and Central Texas is dominated almost exclusively by blue grama (Bouteloua gradis). Blue grama produces 50 to 90% of all forage on well managed ranges and is the species upon which management should be based (Costello 1944). Statements such as these are found frequently in the literature (Albertson et al. 1966; Bement 1969; Hyder et al. 1975; Uresk et al. 1975) and emphasize the importance of the ecology of blue grama to the management of shortgrass ranges. Because of the tufted growth habit and low stature of blue grama, sampling live aboveground biomass is very timeconsuming. In our efforts to circumvent this problem, we evaluated a technique to estimate live and dead biomass of a mixed sample based upon its pigment content (Hunter and Grant 1961). Our objectives here are to report on our evaluation and modifications of the separation technique and to discuss the resultant biomass dynamics data for blue grama.

Aboveground Biomass Dynamics of Blue Grama in a Shortgrass Steppe and Evaluation of a Method for Separating Live and Dead