柠檬桉的他感作用研究

研究了柠檬桉脱落树皮和叶片水抽提物、根系分必物、叶片挥发物对受体萝卜发芽的他感作用，结果表明，柠檬桉脱皮和叶片水抽提物、根系分泌物、叶片挥发物都含有抑制物质；在年周期中柠檬桉的他感作用与降雨量有明显的负相关；马唐等９种参试受体植物对柠檬桉中的抑制物质有不同的敏感性；水抽提液中的抑制物质不易在土壤中滞留且对受体植物的作用效果是暂时的，而挥发性中的抑制物质在土壤中滞留时间较长而且受体植物受其作用后难以恢复生长。

STUDIES ON THE ALLELOPATHY OF Eucalyptus citriodora HOOK.

Eucalyptus citriodor Hook.is an important tree spedes of plantation in South China.The allelo pathic effects of aqucous extract of bark,leaf, root exudates and leaf volatiles on the germination and seedling growth of radish were studled.The results indicated that there are allelochemicals existed in aqueous extract of bark,leaf,root exudates and volatiles.Different sensitivity to inhibitions were existed in 9 acceptor plants.The inhibitor from aqueous extracts which has reversible effect to other plants were not easy to stay insoi.Volatiles inhibitions were easy accumulated in soil,its'inhibitory effects is inreversible.The inhibitory effects were significantly negatively correlated with the monthly rainfall in a year.