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Table 4 Net photosynthetic rate (Pn) of Helianthus tuberosus and Ageratina adenophora competition under different shade levels

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

Variables

Different shade rates

60%

40%

20%

0%

July

 H. tuberosus (µmol CO2 m−2 s−1)

  H. tuberosus: A. adenophora = 4:0

8.67 ± 0.07d

10.36 ± 0.09c

13.51 ± 0.09b

15.59 ± 0.06a

  H. tuberosus: A. adenophora = 1:1

8.57 ± 0.10d

10.34 ± 0.11c

13.55 ± 0.11b

15.57 ± 0.10a

 A. adenophora (µmol CO2 m−2 s−1)

  H. tuberosus: A. adenophora = 1:1

5.05 ± 0.03d

6.05 ± 0.02c

8.80 ± 0.03b

9.10 ± 0.06a

  H. tuberosus: A. adenophora = 0:4

5.13 ± 0.07d

6.21 ± 0.06c

8.83 ± 0.08b

9.27 ± 0.07a

August

 H. tuberosus (µmol CO2 m−2 s−1)

  H. tuberosus: A. adenophora = 4:0

10.81 ± 0.05d

13.11 ± 0.05c

16.65 ± 0.09b

18.42 ± 0.09a

  H. tuberosus: A. adenophora = 1:1

10.67 ± 0.07d

13.63 ± 0.06c

16.88 ± 0.05b

18.84 ± 0.06a

 A. adenophora (µmol CO2 m−2 s−1)

  H. tuberosus: A. adenophora = 1:1

6.71 ± 0.03d

7.27 ± 0.08c

9.05 ± 0.01b

10.10 ± 0.02a

  H. tuberosus: A. adenophora = 0:4

7.43 ± 0.04d

9.38 ± 0.04c

11.21 ± 0.04b

13.26 ± 0.07a

September

 H. tuberosus (µmol CO2 m−2 s−1)

  H. tuberosus: A. adenophora = 4:0

11.64 ± 0.09d

13.68 ± 0.08c

17.62 ± 0.12b

20.11 ± 0.18a

  H. tuberosus: A. adenophora = 1:1

12.71 ± 0.05d

15.64 ± 0.07c

19.19 ± 0.13b

21.49 ± 0.12a

 A. adenophora (µmol CO2 m−2 s−1)

  H. tuberosus: A. adenophora = 1:1

8.14 ± 0.08d

8.31 ± 0.07c

10.06 ± 0.01b

11.46 ± 0.13a

  H. tuberosus: A. adenophora = 0:4

8.93 ± 0.03d

10.47 ± 0.06c

13.37 ± 0.07b

15.51 ± 0.17a

October

 H. tuberosus (µmol CO2 m−2 s−1)

  H. tuberosus: A. adenophora = 4:0

11.03 ± 0.03d

12.85 ± 0.08c

15.18 ± 0.07b

18.39 ± 0.06a

  H. tuberosus: A. adenophora = 1:1

11.70 ± 0.10d

13.68 ± 0.09c

15.80 ± 0.03b

18.53 ± 0.07a

 A. adenophora (µmol CO2 m−2 s−1)

  H. tuberosus: A. adenophora = 1:1

6.52 ± 0.04d

7.55 ± 0.06c

8.88 ± 0.05b

10.46 ± 0.05a

  H. tuberosus: A. adenophora = 0:4

8.24 ± 0.05d

9.64 ± 0.06c

11.99 ± 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
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BMC Ecology and Evolution

ISSN: 2730-7182

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