大金发藓和小蛇苔化学他感作用的生物测定

以绿豆、油菜和萝卜种子为生测材料，以大金发藓（Polytrichum commune Hedw.）和小蛇苔(Conocephalum japonicum(Thunb.) Grolle.)的水提取液为处理液，测定了二种苔藓植物提取液在三种浓度下对三种作物种子萌发率、萌发指数、萌发势、种子活力、幼苗根重和鲜重和根长等指标的影响。发现绿豆是理想的生测材料，种子活力指数、幼苗鲜重、根重和根长是理想的生测指标；二种苔藓植物的水提取液表现出类似于激素样的作用方式，对种子萌发和幼苗生长，表现为低浓度下促进、高浓度时抑制的化学他感效应。

Bioassay on Allelopathic Effect of Polytrichum commune and Conocephalum japonicum

The allelopathic effect of the aqueous extraction of Polytrichum commune Hedw. and Conocephalum japonicum(Thunb.) Grolle.on the seed gerimination and seedling growth was determined. The seeds of Vigna radiate, Raphanus sativus and Brassica campestris were used as bioassay materials, and the indices including the germinating rate, germinating index, germination energy, seed vitality, weight of seedling and radicle, as well as root length were determined. The experiments show that Vigna radiate is an ideal bioassay material, and the seed vitality index, seedling root weight, and root length are perfect bioassay indices for the two bryophytes. Besides, the effects of the aqueous extractions of the two bryophytes on the seed germination and seedling growth are somewhat similar to those of phytohormones, the aqueous extraction at low concentration is able to promote the seed germination and seedling growth, while inhibit at higher concentration.