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Table 4 Plant number per unit area (1 m × 1 m) across different densities during the second year (Mean ± SE)

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

Growth stages A. artemisiifolia A. trifida
Low-density High-density Low-density High-density
SS 141 ± 5.3Ba 434 ± 10.5Aa 258 ± 4.8Ba 512 ± 11.5Aa
VS 59 ± 3.1Bb 101 ± 5.2Ab 113 ± 2.8Bb 435 ± 6.2Ab
BS 43 ± 1.3Bc 62 ± 2.6Ac 76 ± 1.4Bc 103 ± 1.1Ac
MS 34 ± 1.6Bc 45 ± 1.4Ad 26 ± 0.7Bc 38 ± 1.1Ad
  1. Different uppercase letters indicate significant differences in plant number between high and low densities at the same growth stage (P < 0.05), while different lowercase letters indicate significant differences in plant number across different growth stages at the same density (P < 0.05)