Nitrogen enrichment alters the resistance of a noninvasive alien plant species to Alternanthera philoxeroides invasion

Soil nitrogen can significantly affect the morphology, biomass, nutrient allocation, and photosynthesis of alien vs. native plants, thereby changing their coexistence patterns; however, effect soil on interspecific relationship between plants is currently unclear. We conducted a addition experiment in greenhouse to explore invasive weed Alternanthera philoxeroides noninvasive horticultural plant Oxalis articulata. set three experimental factors—nitrogen treatment, planting type, species measured carbon (C) (N) content, physiological traits, photosynthetic fluorescence studied species. then used multi-way ANOVA multiple comparisons examine differences above indicators among treatment combinations. found that, mixed cultures, increased root area O . articulata by 128.489% but decreased length 56.974% compared with control, while it A 130.026%. Nitrogen did not biomass accumulation these two species; root/shoot ratio were significant higher than those philoxeroides. N content 278.767% C:N 66.110% cultures. caused trade-off flavonoid anthocyanin , initial (F 0 ) maximal m 18.649 23.507%, respectively, These results indicate that absorption assimilation ability deep soil; furthermore, enhanced advantages for terms plasticity, efficiency. In addition, had better individual underground competitive advantages. Under intensified deposition, biotic replacement natural ecosystems could be further enhanced.