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Table 6 Coverage of the main companion species of different population densities during growth stages (Mean ± SE)

From: The significance of biomass allocation to population growth of the invasive species Ambrosia artemisiifolia and Ambrosia trifida with different densities

Density Companion species Growth stages
SS VS MS BS
Low A. artemisiifolia L. 2.12 ± 0.01c 6.53 ± 0.22d 16.41 ± 1.88b 28.49 ± 1.64a
Cannabis sativa L. 12.83 ± 1.32b 15.69 ± 1.58c 25.10 ± 1.25a 33.68 ± 2.58a
Trifolium repens L. 8.56 ± 0.97b 13.36 ± 0.83b 18.24 ± 2.41b 14.26 ± 1.72b
Artemisia L. 2.78 ± 0.24c 5.21 ± 1.86d 17.54 ± 1.06b 11.33 ± 0.96b
Gramineae 19.53 ± 2.16a 21.85 ± 3.14a 28.24 ± 1.97a 15.54 ± 1.60b
High A. artemisiifolia L. 7.36 ± 1.12b 21.18 ± 2.04a 54.93 ± 2.71a 52.28 ± 2.56a
Cannabis sativa L. 8.41 ± 0.89b 14.32 ± 1.88b 18.33 ± 1.67b 11.62 ± 1.44b
Trifolium repens L. 3.28 ± 0.46c 11.21 ± 1.60b 14.81 ± 2.39b 6.87 ± 0.98c
Artemisia L. 9.11 ± 1.38b 12.56 ± 2.15b 10.67 ± 1.87c 5.34 ± 0.56c
Gramineae 17.28 ± 2.03a 20.69 ± 2.65a 15.19 ± 1.72b 7.71 ± 0.49c
Low Ambrosia trifida L. 1.44 ± 0.01d 3.98 ± 0.13d 18.55 ± 0.92b 32.19 ± 1.21a
Cannabis sativa L. 19.34 ± 0.62b 13.11 ± 0.70c 27.22 ± 1.04a 37.13 ± 0.92a
Trifolium repens L. 10.89 ± 0.64c 25.08 ± 1.24b 21.51 ± 0.99b 13.22 ± 0.72b
Daucus carota L. 1.70 ± 0.01d 4.53 ± 0.12d 7.20 ± 0.05c 1.40 ± 0.02c
Gramineae 29.81 ± 1.01a 35.50 ± 3.31a 26.86 ± 2.40a 17.31 ± 1.90b
High Ambrosia trifida L. 9.83 ± 1.2b 25.09 ± 1.16a 66.81 ± 2.69a 61.31 ± 1.56a
Cannabis sativa L. 6.33 ± 0.66b 4.59 ± 0.67c 16.28 ± 0.9b 13.48 ± 0.46b
Trifolium repens L. 2.67 ± 0.73c 15.37 ± 1.45b 13.33 ± 1.45b 5.41 ± 0.46c
Daucus carota L. 17.7 ± 1.21a 12.29 ± 1.32b 12.90 ± 1.07b 6.74 ± 0.6c
Gramineae 19.44 ± 1.05a 19.78 ± 0.95b 17.31 ± 1.02b 8.11 ± 0.99c
  1. Different lowercase letters indicate significant differences in coverage across different species during the same growth stage (P < 0.05)