TABLE 3.

Leaf gas exchange measurements against lead (Pb) 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	9.48 ± 0.03	2.63 ± 0.02	4.17 ± 0.01	2.22 ± 0.08	22.3 ± 0.13	644.3 ± 17.95
T2	16.21 ± 0.07	2.26 ± 0.05	3.77 ± 0.20	2.13 ± 0.01	26.88 ± 3.18	610.3 ± 4.04
T3	17.04 ± 0.06	1.86 ± 0.05	3.12 ± 0.96	2.11 ± 0.01	20.74 ± 0.07	589.3 ± 9.01
T4	19.81 ± 0.60	1.65 ± 0.01	2.77 ± 0.17	2.07 ± 0.04	19.06 ± 0.07	548.6 ± 1.52
Tragus roxburghii
T1	9.64 ± 0.18	2.70 ± 0.01	4.29 ± 0.01	2.23 ± 0.01	23.18 ± 0.01	662.6 ± 2.08
T2	12.88 ± 0.50	2.54 ± 0.77	3.94 ± 0.05	2.13 ± 0.01	22.98 ± 0.01	649.6 ± 1.52
T3	14.14 ± 0.07	2.40 ± 0.01	3.18 ± 0.01	2.08 ± 0.78	21.18 ± 0.69	621.3 ± 0.57
T4	17.23 ± 0.01	1.94 ± 0.05	2.95 ± 0.06	2.04 ± 0.05	19.91 ± 0.12	595.3 ± 3.05
Aeluropus lagopoides
T1	9.12 ± 0.11	2.63 ± 0.02	4.12 ± 0.04	2.20 ± 0.01	22.90 ± 0.07	652.6 ± 2.30
T2	15.21 ± 0.07	2.55 ± 0.06	3.87 ± 0.17	2.09 ± 0.64	22.73 ± 0.15	642.0 ± 2.0
T3	16.22 ± 0.04	2.40 ± 0.06	3.13 ± 0.01	2.07 ± 0.21	20.92 ± 0.23	620.3 ± 18.47
T4	18.25 ± 0.02	2.17 ± 0.66	3.03 ± 0.09	2.04 ± 0.02	19.66 ± 0.01	576.3 ± 4.04
Cenchrus ciliaris
T1	9.62 ± 0.27	2.76 ± 0.07	4.26 ± 0.01	2.23 ± 0.01	23.15 ± 0.77	659.0 ± 6.55
T2	14.15 ± 0.06	2.64 ± 0.02	4.16 ± 0.08	2.17 ± 0.30	22.88 ± 0.10	649.0 ± 2.0
T3	15.10 ± 0.16	2.53 ± 0.01	3.08 ± 0.01	2.51 ± 0.39	22.66 ± 0.01	634.0 ± 4.0
T4	15.47 ± 0.42	2.44 ± 0.03	2.98 ± 0.11	2.48 ± 0.15	21.79 ± 0.15	585.0 ± 14.1

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.