Abstract: To realize the rational utilization of land resources and reduce cost of field management, the feasibility of a Cinnamomum migao and Aomum villosumt intercropping system was evaluated from the perspective of allelopathy, which would provide theoretical support for intercropping under C. migao plantations. In this study, seeds and seedlings of A. villosumt were treated by different concentrations of aqueous extracts of pericarps and leaves from C. migao to assess the allelopathic effects onA. villosumt. The results showed that pericarp and leaf aqueous extracts of C. migao at high concentration (50 mg·mL^-1) had significant inhibitory effects on the A. villosumt seeds. The total biomass and seedling height of A. villosumt were promoted by low concentration but were inhibited by high concentration of aqueous extracts of pericarp and leaves of C. migao. At the treatment of pericarp aqueous extract, soluble protein, free proline and MDA contents decreased, while soluble sugar content, soil polyphenol oxidase activity, and urease activity increased. At the treatment of leaf aqueous extract, MDA content, SOD activity and urease activity increased, while free proline content decreased. In total, 92 compounds identified by GC-MS were from the pericarps and leaves of C. migao, seven compounds out of which are closely related to the allelopathy of C. migao. Although both pericarp and leaf of C. migao had allelopathic effects on A. villosumt seedlings, but the most allelopathic parts (pericarp) would not accumulate in large quantity in the forest floor. It is feasible to construct the intercropping system of C. migao-A. villosumt by timely cleaning up fruit and leaf litter of C. migao and interplanting A. villosumt in the understorey.

Key words: Malus hupenhensis, AFOF, antagonistic bacteria, apple replant diseases