Table 2. Wood and Cell Properties Under Ambient CO2, Elevated CO2, Fertilization, and Elevated CO2 With Fertilizationa 								

	Ambient [CO2]		Elevated [CO2]					
	Control n = 8	SE						
	Fertilized n = 5	SE						
		Control						
n = 4	SE							
	Fertilized							
n = 1								
  Tracheid length, mm	2.43 [b]	(0.04)	2.22 [c]	(0.10)		2.08 [c]	(0.10)	2.30 [b,c]
  Tracheid diameter, ?m	38.43	(0.40)	39.89	(1.92)		37.93	(0.28)	37.80
  Lumen diameter, ?m	26.60	(0.66)	29.50	(1.52)		27.21	(0.31)	27.95
  Wall thickness, ?m	5.91	(0.18)	5.19	(0.37)		5.35	(0.12)	4.92
  K lignan fraction	0.31 [b]	(0.002)	0.30 [c]	(0.002)		0.31 [b]	(0.002)	0.30 [b,c]
  2000 latewood fraction	0.21	(0.04)	0.16	(0.02)		0.15	(0.005)	0.15
  2001 latewood fraction	0.18	(0.01)	0.17	(0.03)		0.14	(0.01)	0.12
  2002 latewood fraction	0.32	(0.02)	0.32	(0.03)		0.28	(0.01)	0.27
  Specific gravity, g cm-3	0.37 [b]	(0.01)	0.34 [c]	(0.02)		0.37 [b]	(0.01)	0.37 [b]
aSE, standard error. Letters in brac?kets indicate statistical significance at P < 0.1. Letters in brackets are not included for variables in which no significant treatment differences occurred.