Non-native invasive plant species influence plant community composition and competitively eradicate native species. However, there is doubt regarding how global invasive species increase and explosively interfere with native plants. Invasive plants always have strong allelopathic potential. In this study, allelopathic effects of switchgrass on redroot pigweed and crabgrass growth were investigated by field and laboratory experiments. Within a 0.4-m distance of switchgrass, density and shoot biomass of native species were significantly suppressed in the field, with 95.1% and 93.0% inhibition on density of redroot pigweed and crabgrass and with 99.0% and 97.7% inhibition on shoot biomass, respectively, during the third growing season. Significant inhibitory effects on shoot and root biomass were observed at the 5:5 (switchgrass–native species) proportion in glass bottles, by 41.57% and 51.21% for shoot and root biomass of redroot pigweed and by 33.42% and 56.95% for shoot and root biomass of crabgrass, respectively. Results of a glass bottle experiment showed that shoot and root biomass of redroot pigweed and crabgrass could be significantly inhibited by contact with switchgrass root. Results of a Petri dish experiment showed that aqueous extracts of switchgrass significantly inhibited germination process of both species at high concentrations, with 90.74% and 18.62% inhibition on germination rate and plumule length of redroot pigweed and with 63.59%, 16.38%, and 19.92% inhibition on germination rate, plumule, and radicle lengths of crabgrass, respectively, at the concentration of 0.1 g·mL⁻¹. This report demonstrated that switchgrass had allelopathic effects on redroot pigweed and crabgrass growth.

非本地入侵植物物种影响植物群落组成并竞争性地根除本地物种。但是，对于全球入侵物种如何增加并爆炸性地干扰本地植物存在疑问。入侵植物总是具有很强的化感潜力。在这项研究中，通过野外和实验室试验研究了柳枝switch对红根杂草和马crab草生长的化感作用。在柳枝0.4的0.4 m距离内，田间原生种的密度和枝条生物量被显着抑制，对红根杂草和马尾草的密度分别抑制95.1％和93.0％，对枝条生物量的抑制分别为99.0％和97.7％。 ，在第三个生长季节。在5点观察到对芽和根生物量的显着抑制作用：在玻璃瓶中占5（柳枝-本地种）的比例，红根杂草的芽和根生物量的比重分别为41.57％和51.21％，而马crab的茎和根生物量的比重分别为33.42％和56.95％。玻璃瓶实验的结果表明，与柳枝root的接触可以显着抑制赤根藜和马crab的芽和根生物量。培养皿实验的结果表明，柳枝aqueous的水提物在高浓度下均能显着抑制这两种物种的发芽过程，对紫苏的发芽率和羽状长度的抑制率分别为90.74％和18.62％，分别为63.59％，16.38％和19.92％。在0.1 g·mL的浓度下分别抑制马尾草的发芽率，幼芽和胚根长度 紫茎泽兰的枝条和根生物量分别为21％和33.42％和56.95％。玻璃瓶实验的结果表明，与柳枝root的接触可以显着抑制赤根杂草和马crab的芽和根生物量。培养皿实验的结果表明，柳枝aqueous的水提物在高浓度下均能显着抑制两种物种的发芽过程，对红根杂草的发芽率和羽状长度的抑制率分别为90.74％和18.62％，分别为63.59％，16.38％和19.92％。在0.1 g·mL的浓度下分别抑制马尾草的发芽率，幼芽和胚根长度 紫茎泽兰的枝条和根生物量分别为21％和33.42％和56.95％。玻璃瓶实验的结果表明，与柳枝root的接触可以显着抑制赤根杂草和马crab的芽和根生物量。培养皿实验的结果表明，柳枝aqueous的水提物在高浓度下均能显着抑制两种物种的发芽过程，对红根杂草的发芽率和羽状长度的抑制率分别为90.74％和18.62％，分别为63.59％，16.38％和19.92％。在0.1 g·mL的浓度下分别抑制马尾草的发芽率，幼芽和胚根长度 玻璃瓶实验的结果表明，与柳枝root的接触可以显着抑制赤根杂草和马crab的芽和根生物量。培养皿实验的结果表明，柳枝aqueous的水提物在高浓度下均能显着抑制两种物种的发芽过程，对红根杂草的发芽率和羽状长度的抑制率分别为90.74％和18.62％，分别为63.59％，16.38％和19.92％。在0.1 g·mL的浓度下分别抑制马尾草的发芽率，幼芽和胚根长度 玻璃瓶实验的结果表明，与柳枝root的接触可以显着抑制赤根杂草和马crab的芽和根生物量。培养皿实验的结果表明，柳枝aqueous的水提物在高浓度下均能显着抑制两种物种的发芽过程，对红根杂草的发芽率和羽状长度的抑制率分别为90.74％和18.62％，分别为63.59％，16.38％和19.92％。在0.1 g·mL的浓度下分别抑制马尾草的发芽率，幼芽和胚根长度^-1。该报告表明柳枝switch对红根杂草和马唐草的生长具有化感作用。