Abstract: Salt tolerance and growth properties of Myriophyllum spicatum were investigated by both artificial seawater culture and cultivation in Hangzhou Bay. Results from the indoor cultivation showed that the branch of M. spicatum could grow normally in artificial seawater with salinity less than 12. Low salinity treatment promoted the growth of adventitious roots. When salinity reached 15, the chlorophyll content and maximum photosynthetic efficiency (F_v/F_m) of M. spicatum decreased, the growth was stagnant, and most plants died gradually. Results from field cultivation showed that M. spicatum could survive in the salinity of 6.06-9.03 in Hangzhou Bay from June 2017 to May 2018, with water temperature of 3.85-33.37 ℃. The rapid growth period of M. spicatum was from August to October. M. spicatum can carry on sexual reproduction and vegetative reproduction in the low salinity water of Hangzhou Bay, mainly by vegetative reproduction. These results provide basis for the establishment of M. spicatum in waters with low salinity.

Key words: Spring wheat spring faba bean intercropping, Root system, Nitrogen supply, Phosphorus supply, Regulation