Abstract: Taking an unfenced mobile sandy land as the control, this paper studied the growth characteristics and biomass allocation of Setaria viridis on five types of fenced sandy lands, i.e., mobile sandy land, semimobile sandy land, semi-fixed sandy land, fixed sandy land, and interdunal lowland. The results showed-that with the improvement of the environment, the ramet number on fenced sandy lands decreased, while the leaf length, leaf length/width ratio, and the longest ear length increased. The plant height was in the order of interdunal lowland> fixed sandy land>semi-fixed sandy land>semi-mobile sandy land>mobile sandy land, but the root length and root length /plant height ratio were in adverse. The aboveground and underground biomass of S. viridis differed with different types of fenced sandy lands, but the allocation patterns were similar. The aboveground biomass occupied more than 80% of the total, while underground biomass was less than 20%.

Key words: Photodegradation, Chlorella vulgaris, 17β-estradiol