Fig. 1From: The significance of biomass allocation to population growth of the invasive species Ambrosia artemisiifolia and Ambrosia trifida with different densitiesOrgan and total biomass of two ragweed at different growth stages (Mean ± SE). a–d Root, stem, leaf, total biomass for A. artemisiifolia. e–h Root, stem, leaf, total biomass for A. trifida. Different lowercase letters indicate significant differences in biomass at different growth stages but the same population density (P < 0.05), while different uppercase letters indicated significant differences in at different densities but the same growth stage (P < 0.05)Back to article page