Allelopathic Effects of Common Green Waste in North China on Seed Germination
[Objective]The purpose of this study is to facilitate the classification and reutilization of green waste derived from pruning activities and to examine its allelopathic effects when applied as mulch on un-derlying plant species following appropriate processing.[Method]In present study,the branches and leaves of four common landscaping tree species in North China were employed as experimental materials.Four concentration gradients of aqueous extracts,ranging from 0.25%to 0.2%,were formulated and designed,with distilled water serving as a control.The germination rate,germination potential and germination indices of Medicago sativa and Agropyron cristatum were measured under each aqueous extracts treatment.By in-tegrating these indicators,a comprehensive allelopathic index was developed,facilitating a comparative analysis of the allelopathic effects of aqueous extracts derived from the pruning green waste of four landscaping trees.[Result]①The aqueous extracts of Amorpha fruticose,Sophora japonica and Platycladus orientalis had a comprehensive inhibitory effect on the germination of A.cristatum;②The aqueous extracts from those three landscape tree species exhibited an allelopathic effect on Medicago sativa seeds characterized by 'low promotion and high inhibition';③The aqueous extracts from the branches and leaves of Rhus typhina had a significant negative allelopathic effects on the germination of both herbaceous plant seeds.[Conclusion]The aqueous extracts from R.typhina branches and leaves exhibit the strongest allelopathic effect,demonstrating a comprehensive inhibitory effect on the germination of both herbaceous seeds even at low concentrations.Therefore,the pruning branches and leaves from R.typhina should be subjected to more in-depth processing for potential applications.
branches and leaves aqueous extractsherbaceous plantsseed germinationallelopathic effects
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