Abstract:

In order to compare the allelopathy strength of the aqueous extract from aerial parts of Elsholtzia stauntonii Benth., taking its fresh stems, leaves and inflorescences as the donors and the seeds of Iris Pseudacorus L. as the recipients, the experiment was designed as 3×5 factorial and arranged randomly, the four indexes such as germination energy, germination percentage, germination index and seedling percentage of the recipients were determined by bioassay methods and the response index (RI) and synthesis effect (SE) were also calculated. The results showed that both the two factors (donor type and aqueous extract concentration) had great significant effects (P<0.01) on the four indexes. And the allelopathy of aqueous extracts both stems and inflorescences, among the tree aerial parts, on receipts became stronger as the concentration increased; the SE values of the tree parts were -4.6, -6.45, -4.84, respectively, which indicated the order of allelopathy suppression was leaves>inflorescences>stems. Leaves, stems and inflorescences of E. stauntonii can release allelochemicals, and leaves can release more.