苜蓿不同器官水浸提液对中间锦鸡儿种子萌发的影响

为了探讨苜蓿不同器官水浸提液对中间锦鸡儿种子萌发的化感影响，采用生物测定法，研究了苜蓿根、茎叶不同浓度水浸提液（0.5，1.0，5.0，10.0，25.0 mg/ml）对中间锦鸡儿种子萌发及幼苗生长的化感作用。结果表明，苜蓿不同器官水浸提液对中间锦鸡儿种子萌发有明显的抑制作用，随着苜蓿各器官水浸提液浓度的增加，抑制作用增强。相同浓度下根水浸提液对中间锦鸡儿种子萌发的抑制作用大于茎叶水浸提液。当苜蓿各器官水浸提液为1.0 mg/ml浓度时，中间锦鸡儿幼苗的胚根长、胚轴长、苗高均高于对照；而在25.0 mg/ml浓度时，各器官水浸提液对幼苗则表现出显著的抑制作用（P < 0.05）。本文通过研究苜蓿和中间锦鸡儿的化感作用，以期为人工建置灌草间作提供理论基础。

Allelopathic Effects of Aqueous Extracts from Alfalfa on Caragana intermedia Seed Germination

In order to investigate allelopathic effects of aqueous extracts from different organs of alfalfa on seed germination of Caragana intermedia, the allelopathic effects of aqueous extracts with a range of concentrations of 0.5, 1.0, 10.0 and 25.0 mg/ml from root, stem and leaf of alfalfa on seed germination and seeding growth of Caragana intermedia were studied by method of bioassay. The results showed that aqueous extracts from different organs of alfalfa had inhibition effect on seed germination of Caragana intermedia, the inhibition effect increased with the concentration increase of aqueous extracts. The inhibitory potency of aqueous extracts from root was stronger than those form stem and leaf at the same concentration level. When all aqueous extracts of alfalfa were the concentration of 1.0 mg/ml, the radicle length, hypocotyl length and height of Caragana intermedia seeding were stronger than those of control; while the aqueous extracts of alfalfa were the concentration of 25.0 mg/ml, aqueous extracts from different organs had obvious inhibition effect on the seeding (P < 0.05). This study could offer theoretical basis for establishing artificial shrub-grass intercrop system through researching the allelopathic effects between alfalfa and Caragana intermedia.