摘要：

In this research, eleven medicinal species were planted in pots containing humus horizon soils collected from Betula platyphylla and Quercus liaotungensis woodlands in the Qiaoshan Area in the Loess Plateau. The seed germination, seedlings growth and physiological indexes of medicinal species were measured and the allelopathic effects of humus horizon soil on medicinal species were studied. The results showed that the humus soil of B. platyphylla woodland showed obvious allelopathic inhibitory effects on Achyranthes bidentata, Bupleurum chinense, Glycyrrhiza uralensis and Arisaema heterophyllum, followed by Astragalus membranaceus, Isatis tinctoria, Belamcanda chinensis and Polygala tenuifolia. The humus soil of Q. liaotungensis woodland showed remarkable all elopathic inhibitory effects on A. membranaceus, A. bidentata and I. tinctoria, followed by P. tenuifolia, B. chinense, A. heterophyllum and G. uralensis. Based on our results, these medicinal plants were not recommended to be planted in B. platyphylla and Q. liaotungensis forests, or they could be planted after intermediate cuttings of forests and removing of litters, in order to impair the allelopathic inhibitory effects of tree species on the medicinal plants.

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