Allelopathic Effects of Extracts of 8 Cover Crops on Cynodon dactylon （L.） Pers. and Bidens pilosa L.
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摘要: 采用室内生物测定法检测柱花草(Stålosanthes)、百喜草(Paspalum notatum Flugge)、早熟禾(Poa annua L.)、平托落花生(Arachis pintoi)、大叶油草(Axonopus compressus P.)、长柔毛野豌豆(Vicia villosa Roth)、高羊茅(Festuca elata Keng ex E.)以及鼠茅草(Vulpia myuros C.Gmelin)等8种生草对狗牙根(Cynodon dactylon(L.) Pers.)和鬼针草(Bidens pilosa L.)的化感作用。结果表明:狗牙根受8种生草水浸提物的抑制作用高;8种生草水浸提物对鬼针草萌发率的作用效果表现出"低浓度促进,高浓度抑制"的双重效应,而对其幼苗根茎生长具有明显的抑制作用,且浓度越大抑制作用越强;8种生草水浸提物对狗牙根萌发率、根长及茎长的作用也表现出显著的抑制作用。Abstract: Eight cover crops Stålosanthes, Paspalum notatum Flugge, Poa annua L.,Arachis pintoi,Axonopus compressus P. P, Vicia villosa Roth, Festuca elata Keng ex E. were collected, extracted and used as donors to treat 2 species of weeds（Cynodon dactylon（L.） Pers. and Bidens pilosa L.） as receptors to observe their allelopathic effects on the weeds through indoor bioassay. The results showed that the aqueous extracts of 8 cover crops produced the highest inhibiting effect on the germination rate of Cynodon dactylon, a dual effect（promotion at a low concentration but inhibition at a high concentration） on the germination rate of B. pilosa, and an obvious inhibiting effect on the growth of seedling rhizome of B. pilosa, with a higher inhibition at a higher concentration. The aqueous extracts of 8 cover crops also showed an obvious inhibitory effect on the germination rate, root length and stem length of C. dactylon.
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Key words:
- allelopathy /
- aqueous extract /
- bioassay
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