Carbohydrate Reserves of Sand Reedgrass under Different Grazing Intensities

Abstract

The effect of different grazing intensities on seasonal trend, composition, and concentration of the reserve carbohydrates of sand reedgrass (Calamovilfa longifolia) was studied in northeastern Colorado. Total carbohydrate concentration followed the typical U-shaped seasonal trend. Starch was the major stored carbohydrate. Accumulation of starch began in the roots. With increasing grazing intensity starch concentration in the roots decreased. The soluble carbohydrates were composed of glucose, fructose, and sucrose. A carbohydrate believed to be xylose was found in plants with reserves maintained at a low level for about 2 months. This would indicate a break down of hemicellulose to provide simple carbohydrates for use by the plants. Information from this study can be used in designing grazing management systems for sand reedgrass and its associates.