TABLE 2.

Leaf gas exchange measurements against chromium (Cr) concentrations in Typha angustifolia, Tragus roxburghii, Aeluropus lagopoides, and Cenchrus ciliaris grass species.

Treatment	Co2d (mol m–2 s–1)	RHd	A (μmol CO2 m–2 s–1)	E (mmol H2O m–2s–1)	Gs (mmol H2O m–2 s–1)	Ci (ppm)
Typha angustifolia
T1	12.59 ± 0.15	2.87 ± 0.02	4.24 ± 0.07	2.52 ± 0.13	23.22 ± 0.52	666.3 ± 14.52
T2	19.14 ± 0.11	2.55 ± 0.14	3.91 ± 0.13	2.25 ± 0.05	24.05 ± 0.03	615.0 ± 6.74
T3	19.55 ± 3.31	2.16 ± 0.11	3.20 ± 0.06	2.17 ± 0.05	21.74 ± 0.07	596.0 ± 7.21
T4	19.56 ± 0.29	1.93 ± 0.04	3.14 ± 0.03	2.17 ± 0.04	20.06 ± 0.07	550.6 ± 3.51
Tragus roxburghii
T1	12.55 ± 0.46	2.79 ± 0.15	4.29 ± 0.01	2.33 ± 0.01	23.27 ± 0.11	679.3 ± 3.78
T2	18.69 ± 0.68	2.67 ± 0.08	3.98 ± 0.02	2.23 ± 0.01	22.98 ± 0.11	656.6 ± 6.65
T3	18.76 ± 1.74	2.55 ± 0.08	3.27 ± 0.23	2.18 ± 3.46	21.18 ± 0.69	633.6 ± 6.42
T4	18.85 ± 0.02	2.08 ± 0.09	2.87 ± 0.11	2.15 ± 0.01	19.88 ± 0.18	582.3 ± 14.64
Aeluropus lagopoides
T1	14.07 ± 0.94	2.75 ± 0.05	4.71 ± 0.06	2.26 ± 0.05	23.86 ± 0.10	663.3 ± 8.32
T2	18.23 ± 0.01	2.60 ± 0.08	4.22 ± 0.23	2.19 ± 1.52	23.62 ± 0.15	655.3 ± 5.50
T3	17.53 ± 0.24	2.45 ± 0.05	3.79 ± 0.31	2.17 ± 1.21	21.92 ± 0.23	629.6 ± 17.03
T4	19.03 ± 0.28	2.29 ± 0.01	3.13 ± 0.13	2.16 ± 0.03	20.50 ± 0.48	601.0 ± 2.64
Cenchrus ciliaris
T1	12.50 ± 0.44	2.76 ± 0.77	4.35 ± 0.08	2.26 ± 0.15	23.28 ± 0.14	676.0 ± 4.58
T2	17.76 ± 0.11	2.66 ± 0.02	4.26 ± 0.08	2.17 ± 0.77	22.87 ± 0.08	650.6 ± 1.15
T3	17.82 ± 0.16	2.57 ± 0.03	3.24 ± 0.06	2.20 ± 0.05	22.62 ± 0.04	640.6 ± 6.02
T4	17.84 ± 0.12	2.45 ± 0.02	3.14 ± 0.15	2.55 ± 0.20	21.83 ± 0.14	594.0 ± 12.76

Values are mean ± SD. “Co₂d” is the CO₂ assimilation rate, “RHd” is relative humidity, “A” is net photosynthetic rate, “E” is transpiration rate, “Gs” is stomatal conductance, and “Ci” is leaf internal CO₂ concentration.