| The extracts of Artemisia scoparia aqueous on seed germination and seedling growth of receptor plants were mensurated for the bio-assay of allelopathy. The extracts of the A.scoparia aqueous of different seasonal organs on seed germination and seedling growth of receptor plant were mensurated to study the seasonal dynamics of the allelopathy of A. scoparia aqueous. The extracts of A. scoparia aqueous on some items were tested and analysed, including dynamics of height, fresh weight, Peroxidase (POD), Catalase (CAT), Superoxide Dismutase (SOD) and some other testing index.The resultes showed that:1. The aqueous of A. scoparia affects seed germination and seedling growth of receptor plants. The effects are different on different receptor plants, even on different parts of one plant. There are more inhibitive effects on Medicago sativa ,Kochia scoparia , Amaranthaceae retroflexus than Leymus Chinese, Echinochloa crusgali,and seedling length than root length .The effect is stimulative when the concentration is 0.002g·ml-1, gradually decreased , is appeared and even changed into suppressive effect when the concentration is higher than 0.05 g·ml-1.2. The aqueous of A. scoparia affects seed germination and seedling growth of receptor plant from germination to burliness. The aqueous suppresses germination capacity, germination rate germination index, seedling length and root length of receptor plant. The effects vary in different seasons and different organs during one season.3.The aqueous of A. scoparia affects dynamics of height , fresh weight of the receptor plant M. sativa .The activities and specific activities of CAT,POD and SOD in M. sativa were enhanced to resist the of A. scoparia .The activities of CAT,POD and SOD gradually decease when the concentration of aqueous increases. The mechanism of the allelopathy is simalar that the allelopathy of A. scoparia affects the activity of protective-enzyme of receptor plant and breaks the structure and function of membrane.
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