Table 2. Leaf gas-exchange data.

Maximum leaf net CO₂ assimilation rate ( Amax, μmol m^-2 s^-1 ), mean leaf net CO₂ assimilation rate (Mean A, μmol m^-2 s^-1 ), maximum stomatal conductance (g _smax, mol m^-2 s^-1), mean ratio of intercellular air space to ambient CO₂ concentration (Mean C _i/C _a), and nighttime mean respiratory rate (Mean R, μmol m^-2 s^-1) of the species studied. Data are reported as mean ± 1 SE.

Species	Amax	Mean A	g smax	Mean C i/C a	Mean R
L. chinensis	19.9±3.99	11.8±0.82	0.295±0.022	0.75±0.01	1.32±0.16
P. australis	17.2±0.35	11.8±0.35	0.268±0.011	0.71 ±0.01	0.71 ±0.08
L. bicolor	22.6±1.87	12.2±0.67	0.586±0.047	0.78±0.01	2.07 ±0.26
M. asiatica	22.3±0.90	17.0±0.63	0.446±0.017	0.69±0.01	0.74 ±0.09
P. simonii	23.2±0.32	17.1±0.52	0.511±0.041	0.73±0.03	1.22 ±0.11
P. salicina	15.3±1.65	11.2±0.75	0.531±0.057	0.65±0.01	0.51 ±0.06
C. glaucum	28.8±1.04	21.1±0.43	0.943±0.051	0.80 ±0.01	1.28 ±0.13
G. max	17.0±0.54	10.8±0.49	0.098±0.005	0.20±0.03	1.45±0.11
H. annuus	21.1±0.13	13.1±0.28	0.128±0.002	0.44 ±0.01	1.10 ±0.10
S. amara	15.1±1.20	9.6 ±0.36	0.443±0.022	0.82 ±0.01	0.73 ±0.17
V. radiata	26.3±2.98	14.8±1.64	0.247±0.009	0.81 ±0.01	2.22±0.17
V. unguiculata	23.9±4.90	15.2±2.66	0.712±0.072	0.59 ±0.14	1.54 ±0.17
X. sibiricum	38.4±5.80	21.2±1.20	0.814±0.083	0.79 ±0.02	2.12 ±0.13
C. virgata	28.1±1.71	15.5±1.14	0.179±0.005	0.42 ±0.03	0.91 ±0.13
E. crusgalli	22.6±1.34	13.1±0.20	0.212±0.017	0.49 ±0.03	0.87 ±0.08
H. altissima	22.3±1.68	13.8±1.57	0.146±0.015	0.49 ±0.03	1.36 ±0.24
P. miliaceum	27.9±0.31	18.1±0.28	0.204±0.019	0.41 ±0.03	1.54 ±0.07
S. italica	30.8±2.27	18.0±0.63	0.247±0.013	0.41 ±0.03	0.82 ±0.40
S. viridis	27.6±1.88	15.3±0.57	0.199±0.007	0.49 ±0.01	1.15 ±0.11
S. bicolor	26.2±1.34	17.0±0.47	0.183±0.034	0.27 ±0.02	1.45 ±0.16
Z. mays	33.7±1.62	23.6 ±0.93	0.367±0.051	0.54 ±0.06	0.82 ±0.05
A. retroflexus	33.3±0.53	24.0±0.49	0.520±0.040	0.59 ±0.03	1.80 ±0.10