文献类型： 外文期刊
作者： Li, Aoxin 1 ; Zheng, Ruilun 1 ; Tian, Li 1 ; Wei, Yun 2 ; Wu, Juying 1 ; Hou, Xincun 1 ;
作者机构： 1.Beijing Acad Agr & Forestry Sci, Res & Dev Ctr Grass & Environm, Beijing 100097, Peoples R China
2.Beijing Univ Chem Technol, State Key Lab Chem Resource Engn, Beijing 100029, Peoples R China
关键词： Switchgrass; Redroot pigweed; Crabgrass; Allelopathy
期刊名称：PLANT ECOLOGY （ 影响因子：1.854； 五年影响因子：2.194 ）
ISSN： 1385-0237
年卷期：
页码：
收录情况： SCI
摘要： 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 center dot mL(-1). This report demonstrated that switchgrass had allelopathic effects on redroot pigweed and crabgrass growth.
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