Abstract: The study showed that the relationships between the specific growth rate (μ) of Heterosigma akashiwo and the concentrations of nutrients nitrogen and phosphorus in water body accorded with Monod equation.H.akashiwo started to grow when the concentration of NO₃^--N was higher than 7.5 mg·L^-1,and the specific growth rate (μ) of the algae was proportional to the concentration of NO₃^--N between 3.75～75 mg·L^-1.The maximum growth rate of H.akashiwo(μ_m-n) was 0.3475·d^-1,and the half saturated constant (K_s-n) was 18.91 mg·L^-1.The specific growth rate of the alga was proportional to the concentration of PO₄^--P between 0～1.0 mg·L^-1.The maximum growth rate of H.akashiwo (μ_m-p) was 0.3024·d^-1,and K_s-n was 0.4086 mg·L^-1.The most suitable growth conditions for H.akashiwo were 37.5～225.0 mg·L^-1 NO₃^--N,5.0～500 mg·L^-1 PO₄^--P,and N/P 25.

Key words: Sandy land, Artificial plant community, Vegetation restoration, Ecological process, Caragana microphylla