Biological characteristics of A.artemisiifolia, A.
trifida and companion species (Experiment 3)
Ambrosia trifida was significantly taller than other plant
species in all habitats from LS period to MR period, being 3.45 to 8.3
times taller than the companion species in the FR period. Ambrosia
artemisiifolia was significantly taller than companion species in the
farmland ecotone and residential area from ES period to MR period (Fig.
4).
The density of A. trifida was significantly higher than that of
the other species in all habitats, reaching 1.35 to 4.4 times that of
the companion species in the FR period. The density of A.
artemisiifolia was higher than that of the companion species in the
farmland ecotone, residential area, and roadside, at 1.39 to 2.23 times
that of the companion species in FR period. However, the density ofA. artemisiifolia was lower than that of the companion species in
grassland, at only 0.37 times the density of the companion species in FR
period (Fig. 4).
The coverage of A. trifida was significantly greater than that of
the other species in all habitats from LS period to MR period, at 1.31
to 2.8 times that of the companion species in FR period, respectively.
The coverage of A. artemisiifolia was significantly higher than
that of the companion species in the farmland ecotone and residential
area from EG period to MR period, at 1.84 and 1.7 times that of the
companion species in FR period, respectively. However, the coverage was
significantly lower than the companion species in grassland, at 0.53
times that of the companion species in FR period (Fig. 4).
The 100-seed weight and seed size of A. artemisiifolia andA. trifida in roadside habitats were significantly lower than
those in other habitats. The seed size of A. trifida was about
five times that of A.artemisiifolia , while the weight of A.
trifida seeds was about eight times that of A. artemisiifolia(Fig. 5).
The numbers of seeds per plant of A. artemisiifolia and A.
trifida in roadside habitat were significantly lower than in other
habitats. Ambrosia trifida produced a significantly greater
number of seeds per plant in grassland than in other habitats.
Meanwhile, A. artemisiifolia produced fewer seeds per plant thanA. trifida in grassland, but more than A. trifida in other
habitats (Fig. 5).
Seed yield per m2 of A. artemisiifolia in
various habitats was ranked as follows: farmland ecotone>
residential area> grassland > roadside. Seed
yield per m2 of A. trifida in various habitats
differed as follows: grassland > farmland
ecotone> residential area> roadside. Seed
yield per m2 of A. artemisiifolia was less than
that of A. trifida in all habitats (Fig. 5).