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Caucasian bluestem [Bothr&xhloa tmucaka (Trln.) C.E. Hubb.] ls a warm-aeaaon grass introduced from Eurasia that is currently used for reseeding rangelands in the southern Great Plahts. Although this species is thought to be graaing tolerant, no specific information is available concerning its response to gradng. This study was conducted to evaluate the effect of 2 levels of grazing on xylem water potential ($) and total leaf conductance (IT) of Caucasian blueatem. During the grazing period (mid May to mid September) diurnal tj and gT measurements were made on 3 days in 1983 and 1984, and afternoon measurements were taken at weekly intervals ln 1984. Soil moisture at 15,45, and 75 cm depths was monitored in 1984. Heavily graaed plants exhibited consistently higher (less negative) $, and generally higher gT than lightly grazed plants. Averaged over the season, heavy graxing increased mean afternoon 1,4 and gT by 28 and 7646, respectively, compared to light grazing. Soil moisture was conserved with heavy graaing; treatment differences were greatest during July, which is generally the driest summer month in central Oklahoma. Thus, for Caucasian bluestem, leaves from heavily graxed swards were under less water stress than Ieavea from lightly graaed swards.

Grazing Effects on Water Relations of Caucasian Bluestem