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Table 3 Net photosynthetic rate (Pn) of Helianthus tuberosus and Ageratina adenophora competition under full sunlight

From: Potential use of Helianthus tuberosus to suppress the invasive alien plant Ageratina adenophora under different shade levels

Variables

Ratios (H. tuberosus: A. adenophora)

4:0

2:1

1:1

1:2

0:4

July

 H. tuberosus (µmol CO2 m−2 s−1)

15.59 ± 0.06a

15.65 ± 0.09a

15.57 ± 0.10a

15.69 ± 0.08a

–

 A. adenophora Pn (µmol CO2 m−2 s−1)

–

9.06 ± 0.08b

9.10 ± 0.06b

9.17 ± 0.03ab

9.27 ± 0.07a

August

 H. tuberosus (µmol CO2 m−2 s−1)

18.42 ± 0.09c

18.69 ± 0.07b

18.84 ± 0.06a

18.85 ± 0.03a

–

 A. adenophora Pn (µmol CO2 m−2 s−1)

–

8.98 ± 0.05d

10.10 ± 0.02c

12.59 ± 0.04b

13.26 ± 0.07a

September

 H. tuberosus (µmol CO2 m−2 s−1)

20.11 ± 0.18d

20.80 ± 0.11c

21.49 ± 0.12b

21.83 ± 0.09a

–

 A. adenophora Pn (µmol CO2 m−2 s−1)

–

9.52 ± 0.12d

11.46 ± 0.13c

13.70 ± 0.13b

15.51 ± 0.17a

October

 H. tuberosus (µmol CO2 m−2 s−1)

18.39 ± 0.06c

18.46 ± 0.07bc

18.53 ± 0.07b

18.71 ± 0.05a

–

 A. adenophora Pn (µmol CO2 m−2 s−1)

–

9.28 ± 0.08d

10.46 ± 0.05c

12.64 ± 0.08b

14.26 ± 0.06a

  1. Data are expressed as mean ± standard deviation. Different letters within the same row signify significant differences at P < 0.05