【摘要】 苯酚对新月菱形藻（Nitzschia closterium）的毒性最大,20^#燃料油次之。硫化钠组最大比生长率随浓度的增高而增大。20^#燃料油、苯酚和硫化钠影响其生长的最低觉察效应浓度一未觉察效应浓度（LOEC—NOEC）范围分别为32.00—3.20mg/L,3.20—1.00mg/L,和0.320—0.100mg/L;苯酚影响其叶绿素a含量的216h-EC₅₀为6.739±0.003mg/L,20^#燃料油影响其细胞分裂繁殖的144h-EC₅₀为46.13±1.01mg/L,高浓度燃料油抑制新月菱形藻的生长繁殖及叶绿素a含量,低浓度的则刺激其生长繁殖。更多还原

【Abstract】 The ship "Sea Carrier" (Panamanian) wrecked on 1984 May 11 near Nanji islands (27°00’N, 121°13’E) and polluted this area with No. 20 fuel oil, phenol and sodium sulphide. To assess the pollutant effects of this accident on phytoplankton a series of bioassays have been carried out with Nitzschia closterium by hemacymeter counting as well as absorption and Chl.a detection.The results showed that these three chemicals had obvious effects on N. closterium. Both No. 20 fuel oil and phenol were poisonous, and phenol had the greater effect. In the test period of six days, the maximum specific growth rate of N. closterium increased successively with the rise in concentration of sodium sulphide.The ranges of lowest-observed effective concentration-no-observed effective concentration (LOEC-NOEC) of No. 20 fuel oil, phenol and sodium sulphide affecting the growth of N. closterium were 32.0-3.20 mg/L, 3.20-1.00 mg/L and 0.320-0.100 mg/L, respectively. On the other hand, for the Chl.a content the 216h-EC50 of phenol was 6.739±0.003 mg/L. For cell division and reproduction the 144h-EC50 of No. 20 fuel oil was 46.13±1.01 mg/L. No. 20 fuel oil in high concentrations inhibited the growth, reproduction and the Chi.a content of N. closterium. But the oil in lower concentrations improved the growth and reproduction of the organism.更多还原