Using distilled water and methanol to extract the leaching liquor from softwood and hardwood of Haloxylon ammodendron,and then leaching liquor was placed in the germination paper to determinate biological activity,so as to study the effect of rooting inhibitor activity of Haloxylon.The results showed that the longer the extraction time of distilled water from Haloxylonshoots was,the more obvious inhibition effect had.The vigor index of 48 hwas the lowest,and the activity of inhibiting substance was the larg...