Table 2.

Regression equations for the relationship between root length for each branching order (y) and number of roots (x)

	Shallow-slope					Steep-slope
	Regression equation	R2	P	Regression equation	R2	P
1st order	y = 74·52x + 483·91	0·78	<0·001	y = 71·69x + 365·6	0·64	<0·001
2nd order	y = 54·19x − 116·25	0·98	<0·001	y = 37·63x + 496·26	0·56	<0·001
3rd order	y = 42·29x − 16·83	0·95	<0·001	y = 35·57x + 7·95	0·72	<0·001