An experiment was conducted to study the allelopathy of Thymus mandschurricus Ronn. on Jive receptor plants, namely Pinus sylvestris var. mongolica, Larix gmelini, Betula platyphylla, Tagetes erecla and Petunia hybrid by the method of biological test. Results showed that stem-leaf and root extracts of T. mandschuricus had some inhibitory effects on seed germination of B. platyphylla and P. hyhrida, and the inhibitory effects weakened with decreasing extract concentration. Lower concentration of extract had a stimulative effect on seed germination of P. sylvestris var. mongolica to a certain degree. Stem-leaf and root extracts of T. mandschuricus had no harmful effect on the seedling growth of T. erecla and P. hybrida. Extract with a volume ratio of 1 : 1 had certain inhibitory effect on seeding growth of P. sylvestris var. mongolica and L gmelini. The allelopathy effect of stem-leaf extract was stronger than that of root extract. Root length of the receptor plants received a stronger allelopathy effect than seedling height.%通过生物测定法研究了东北百里香茎叶和根水浸液对樟子松、兴安落叶松、白桦、万寿菊、矮牵牛的种子萌发及幼苗生长的化感作用.结果表明,东北百里香茎叶和根水浸液对白桦、矮牵牛的种子萌发有一定抑制作用,抑制效应随水浸液母液与水的体积比降低而减弱；母液与水的体积比低的水浸液对樟子松的种子萌发有一定促进作用.东北百里香茎叶和根水浸液对万寿菊和矮牵牛幼苗生长无明显不良影响,V(母液)∶V(水)=1∶1的水浸液对樟子松、兴安落叶松的幼苗生长有一定抑制作用.东北百里香茎叶水浸液对受体植物的化感作用强于根水浸液.受体植物幼苗的根长受到的化感作用强于苗高.
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