Abstract: The allelopathic potential of Mikania micrantha was investigated. The bioactivity of the aqueous extract(branches and leaves, roots, litters and soils), organic extracts(branches and leaves)were evaluated on the growth of the following plants : radish(Raphanus sativus), rye grass(Lolium multiforum), white clover(Trifolium repens L. ). The results showed that the aqueous extract of the branches and leaves inhibited the growth of the receptor plants obviously, and the aqueous extract of the roots also influenced the growth of the plants but less significant. The litters had no obvious effect. The petroleum ether and ethanol extract inhibited the growth of the plants,too. However, the ethyl acetate extract had much more impact. The ethyl acetate extract retarded the germination of the seeds, and the height of the plants decreased to 10%, which implied the existence of the allelochemicals.

Key words: NDVI, Precipitation, Temperature, Wave-type time series, Simulation