Table 1.

The mean foliar biogenic silica (BSi) concentrations (%Si by dry wt. ± SE) under the three treatment types and the control for five deciduous and one coniferous species at the Duke FACE experimental forest.

Treatment
Species	Control	CO2 enrichment	N enrichment	N and CO2 enrichment
	(%BSi as Si dry wt.)
Cornus florida (dogwood)	0.07 (±0.01)	0.07 (±0.01)	0.07 (±0.01)	0.08 (±0.01)
Pinus taeda (loblolly pine)	0.97 (±0.07)	0.90 (±0.36)	nm	nm
Cercis canadensis (red bud)	0.27 (±0.02)	0.19 (±0.00)	0.16 (±0.02)	0.50 (±0.21)
Acer rubrum (red maple)	1.06 (±0.12)	0.91 (±0.08)	0.98 (±0.19)	0.94 (±0.06)
Liquidambar styraciflua (sweet gum)	1.08 (±0.16)	0.95 (±0.05)	0.72 (±0.03)	0.92 (±0.11)
Ulmus alata (winged elm)	2.36 (±0.16)	2.57 (±0.23)	2.17 (±0.11)	1.90 (±0.35)

nm = not measured.