Table 5. Linear regression between above- and below-ground biomass for Stipa spp., Cleistogenes spp., Agropyron spp., and Leymus spp. using a standardized major axis (SMA) method.

Genus	R2	Slope(95% CI)	Intercept	p (H0:slope = 1.0)
Stipa	0.60***	0.76 (0.69−0.83)	0.56 (0.48−0.63)	<0.001
Cleistogenes	0.32***	0.83 (0.72−0.94)	0.47 (0.36−0.59)	<0.001
Agropyron	0.48***	0.79 (0.68−0.91)	0.50 (0.37−0.63)	<0.01
Leymus	0.13***	1.06 (0.88−1.16)	0.09 (−0.21-0.06)	= 0.360

95% CI, 95% confidence interval; ***, p<0.001.

Both above- and below-ground biomass were log10–transformed. p is the significance level at which the estimated slopes are different from 1.0.