Linear regression between above- and below-ground biomass for <i>Stipa spp.</i>, <i>Cleistogenes spp.</i>, <i>Agropyron spp.</i>, and <i>Leymus spp.</i> using a standardized major axis (SMA) method.

<p>95% CI, 95% confidence interval; ***, <i>p</i><0.001.</p><p>Both above- and below-ground biomass were log10–transformed. <i>p</i> is the significance level at which the estimated slopes are different from 1.0.