Allelopathic Effects of Water Extraction from Root and Leaf Litter of Rhus typhina on the Germination of Wheat Seeds

The allelopathic effects of different concentration(10%,5%,2.5% and 1.7% respectively) of water extraction from root and leaf litter of Rhus typhina on the germination of wheat seeds were investigated.The results indicated that the germination of wheat seeds was significantly inhibited by the water extractions from both root and leaf litter of R.typhina.The decrease of germination percentage,germination index and vigor index,the delay of germination course(increase of coefficient of germination rate) and evident concentration effects were observed.The allelopathic effect of leaf litter on the germination of wheat seeds was higher than that of root.The highest allelopathy of water extraction from root and leaf litter of R.typhina on the germination index was observed and followed with that on vigor index.The allelopathic effect on the coefficient of germination rate was the lowest.