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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