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Table 2 The gas-exchange characteristics and the light and CO2-response curve parameters of L. chinensis in the plots with different grazing intensities

From: Differences in the photosynthetic and physiological responses of Leymus chinensis to different levels of grazing intensity

 

Control

LG

MG

HG

Pn

(μmol m−2 s−1)

8.46 ± 0.99a

1.64 ± 0.14bc

0.75 ± 0.34c

3.24 ± 0.76b

Tr

(mmol m−2 s−1)

0.67 ± 0.09d

1.98 ± 0.24b

1.46 ± 0.12c

2.73 ± 0.01a

WUE

(μmol mmol−1)

13.65 ± 3.77a

0.83 ± 0.02b

0.51 ± 0.23b

1.18 ± 0.28b

LSP

(μmol·m−2 s−1)

492 ± 1.2b

712 ± 4.5a

501 ± 6.4b

542 ± 2.8b

LCP

(μmol·m−2 s−1)

68 ± 3.2a

28 ± 1.2b

54 ± 4.1a

32 ± 2.0b

Rd

(μmol·m−2 s−1)

2.50 ± 0.18a

1.37 ± 1.24b

2.84 ± 0.21a

1.22 ± 1.28b

AQY

(μmol CO2 μmol−1)

0.039 ± 0.01b

0.049 ± 0.02a

0.037 ± 0.01b

0.039 ± 0.01b

Jmax

(μmol·m−2 s−1)

22.42 ± 1.32d

48.10 ± 2.40a

27.49 ± 2.34c

31.19 ± 1.36b

Vcmax

(μmol·m−2 s−1)

21.89 ± 0.24c

44.30 ± 5.42a

27.34 ± 1.86b

28.29 ± 3.42b

VTPU

(μmol·m−2 s−1)

5.22 ± 0.23c

10.27 ± 0.89a

6.82 ± 0.58b

6.25 ± 0.56b

Jmax/Vcmax

1.024 ± 0.02b

1.085 ± 0.03b

1.005 ± 0.01c

1.102 ± 0.03a

  1. Values are means ± SE (n = 3). Values of a parameter labeled with different letters differ significantly between light intensities (ANOVA followed by LSD test, P < 0.05)
  2. Control no grazing, LG light grazing, MG medium grazing, HG heavy grazing, Pn net photosynthetic rate, Tr transpiration rate, WUE water-use efficiency, LSP light saturation point, LCP light compensation point, Rd dark respiration rate, AQY apparent quantum yield, Jmax maximum electron transport rate, Vcmax maximum carboxylation efficiency, VTPU triose phosphate utilization rate