Table 2.

(S)MATR reduced major axis regression slopes and y-intercepts (α_RMA and log β_RMA, respectively) for log₁₀-tranformed data of forest-level above- and below-ground biomass (M_A and M_R, respectively) and stem and root biomass (M_S and M_R, respectively) (original units: tonnes dry mass per hectare). Data, grouped according to biomes, taken from Luo (1996) and Feng et al. (1999)

	αRMA (95% CI)	Log βRMA (95% CI)	r2
Boreal (n=229)
Log MA vs. log MR	1·08 (0·986, 1·17)	0·476 (0·329, 0·622)	0·563
Log MS vs. log MR	1·12 (1·02, 1·22)	0·384 (0·230, 0·538)	0·549
Temperate (n=511)
Log MA vs. log MR	0·836 (0·796, 0·875)	0·665 (0·615, 0·702)	0·658
Log MS vs. log MR	0·888 (0·847, 0·929)	0·551 (0·498, 0·604)	0·716
Subtropical (n=767)
Log MA vs. log MR	1·06 (1·04, 1·08)	0·494 (0·466, 0·522)	0·927
Log MS vs. log MR	1·08 (1·06, 1·10)	0·430 (0·400, 0·459)	0·923
Tropical (n=27)
Log MA vs. log MR	1·06 (0·864, 1·26)	0·239 (−0·065, 0·543)	0·797
Log MS vs. log MR	1·10 (0·892, 1·31)	0·133 (−0·190, 0·455)	0·788

M_A vs. M_R or M_S vs. M_R scaling exponents in bold type have 95% CIs that numerically include those reported at the level of individual plants (α_RMA=1·06 and 1·08, respectively; see Niklas, 2005).