Abstract: Sand-fixing pioneer plant Artemisia wudanica that distributed in the western part of Horqin sandy land showed a declining trend in recent years. Three main aerial seeding plants A.sphaerocephala, Caragana korshinskii, Hedysarum leave and A.wudanica itself were selected to study allelopathy. The results showed that: the aqueous extracts of three aerial seeding plants and A.wudanica itself all had different allelopathy on the growth of A.wudanica, and allelochemicals in different parts (root, leaf, peel or bracts) had different functions. Furthermore, the germination rates of A.wudanica seeds in the root aqueous extracts of all donor plants were significantly declined except H.leave. A.sphaerocephala bracts and H.laeve peel aqueous extracts also had the same result, while the leaf extract of A.wudanica had promoting effect. The aqueous extracts from different parts of four species had obvious inhibitory effects on A.wudanica seed germination speed and root growth. By synthetical effect, four species all had inhibitory effects, the order of inhibitory effects from strong to weak was as follows: A.sphaerocephala>C.korshinskii>A.wudanica>H.laeve.

Key words: Artemisia wudanica, allelopathy, aerial seeding plant, aqueous extracts