| Abstract: | To investigate the bioremediation function of Sargassum thunbergii, the sea weed was cultivated in ponds from March 2009 to July 2010, and the growth of thalli cultured in four modes with different temperature, light intensity, salinity and pH was determined. The results showed that, 1） under the same experimental conditions, wild seedlings grew faster than the curtain seedlings, and artificial seedlings grew even slower; 2） water-level of 40-60 cm was most suitable for the growth of S. thunbergii, better than 0-20 cm or 80-100 cm, while 150-200 cm showed the slowest growth and the thalli began to drop off due to decaying in mid May; 3） the thalli grew most rapidly at water flow rate of 1 m/s, which slowed down with the decrease of flow rate; 4） the thalli growth was at its best at light intensity between 4 000-6 000 Ix, and the growth rate was relatively slower with the light intensity above 10 000 lx or below 3 000 Ix. Ad ditionally, this study also showed that from late April to mid May （water temperature, 14-18 ℃）, S. thunbergii entered the fast-growth stage, with rapid increase of length and biomass;from mid May to early June （water temperature, 18-23 ℃）, the seaweed started to spawn and its length and biomass reached the maximal values;from mid-to-late June （water temperature, ）24 ℃）, the seaweed began to decay and rot off due to the increasing water temperature. |
