. 2007 Jun 22;100(2):283–303. doi: 10.1093/aob/mcm107

Table 3.

Comparison of the relationships of fractional biomass in support with fresh mass of lamina and mid-rib (M^F_TL) and fresh mass of whole leaf (M^F_WL): parameters of the regressions in the form y = a + bLn(x)

A: Life form differences
		Regression characteristics^†
Relationship*	Group	n	a	b	r²
F^R_TL vs. M^F_TL	All	122	0·156	0·0255	0·34
	Herbaceous	72	0·281A	0·0169A	0·38
	Woody	50	0·128B	0·0145A	0·20
F^R_WL vs. M^F_WL	All	122	0·130	0·0138	0·15
	Herbaceous	72	0·140A	0·0151A	0·17
	Woody	50	0·115A	0·0069A	0·07^‡
F^P vs. M^F_WL	All	122	0·111	0·0363	0·41
	Herbaceous	72	0·122A	0·0369A	0·40
	Woody	50	0·0929A	0·0306A	0·39
F^P + F^R_WL vs. M^F_WL	All	122	0·240	0·0505	0·59
	Herbaceous	72	0·259A	0·0525A	0·61
	Woody	50	0·206B	0·0377A	0·51
B: Climatic differences
		Regression characteristics
Relationship	Group^§	n	a	b	r²
F^R_TL vs. M^F_TL	Temperate	46	0·160A	0·0288A	0·48
	Mediterranean	52	0·151A	0·0190A	0·14
	Tropics	24	0·129B	0·0344A	0·42
F^R_WL vs. M^F_WL	Temperate	46	0·121B	0·0146A	0·26
	Mediterranean	52	0·136A	0·0122A	0·08
	Tropics	24	0·120B	0·0186A	0·16
F^P vs. M^F_WL	Temperate	46	0·148A	0·0421A	0·59
	Mediterranean	52	0·081B	0·0197A	0·16
	Tropics	24	0·075B	0·0435A	0·31
F^P + F^R_WL vs. M^F_WL	Temperate	46	0·265A	0·0568A	0·74
	Mediterranean	52	0·218	0·0295B	0·23
	Tropics	24	0·196B	0·0622A	0·62

* F^R_TL, fraction of mid-rib biomass in lamina; F^R_WL, fraction of mid-rib biomass in whole leaf; F^P, fraction of petiole biomass in whole leaf, F^P + F^R_WL, total whole leaf biomass in support.

^† Regression coefficients with the same upper-case letter are not significantly different from each other according to ANCOVA analyses (separate slope analysis with an interaction term followed by a common slope analysis that lacks the interaction term). When the slopes were statistically different (significant interaction term), ANCOVA analysis was completed as the common slope test to separate the regression elevations is not meaningful in such a case (Sokal and Rohlf, 1995).

^‡ All r² values are at least significant at P < 0·05, except the regression with r² = 0·07 (P = 0·06).

^§ Mediterranean species group refers to Mediterranean and warm/temperate vegetation, temperate group to cool temperate plants and tropics group to subtropical and tropical species (see Appendix).