Changes in frequency and abundance of Vernonia baldwinii and Solidago rigida under cattle grazing
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It is widely believed that non-grazeable native grassland forbs, such as Vernonia baldwinii (Baldwin’s ironweed) and Solidago rigida (stiff-leaved goldenrod), negatively impact grazeable grasses and potentially lead to economic losses for ranchers. One reason for the increase in these forbs is overgrazing of pastures. This study tests whether decreased grazing pressure will lead to stabilization or reduction of S. rigida and V. baldwinii on a Flint Hills ranch. Following a noteworthy increase in these species at this ranch, long-term monitoring plots were established in 2019. The initiation of this monitoring coincided with a reduction in grazing intensity in 2020 and subsequent years. Using a systematic sampling design, six transects with six, 1x1 meter plots were surveyed periodically over a five-year period to quantify species frequency, abundance, and the presence of other grasses and forbs. Data collection adhered to a standardized protocol to ensure consistency and accuracy. I found evidence for stabilization or declines for these forb species over the sample period, and there was evidence for broad decline of these species in certain portions of the ranch. These findings suggest that, under careful cattle management, these non-grazeable forbs are unlikely to negatively impact pasture quality. This conclusion would be strengthened by further monitoring of species abundances and quantification of grazing activity.

