中文摘要：

研究了不同Cd2＋浓度与硝酸盐浓度、磷酸盐浓度交互作用对杜氏盐藻（Dunaliellasalina）生长及叶绿素荧光特性的影响。结果表明，Cd2＋浓度与硝酸盐浓度、磷酸盐浓度对杜氏盐藻的光合作用及生长均具有显著影响（P〈O．05）；Cd2＋胁迫24h后，杜氏盐藻的荧光参数Fv／FmFv／Fo、Yield、rETR、细胞密度和叶绿素相对含量均与Cd2＋浓度表现为显著的负相关；在低硝酸盐摩尔浓度（55μmol／I．）下，杜氏盐藻的荧光参数Fv／Fm、Fv／Fo、Yield、rETR、细胞密度和叶绿素相对含量均明显下降；在高硝酸盐摩尔浓度（7040μmol／L）下，杜氏盐藻的上述荧光参数下降幅度小；在正常硝酸盐摩尔浓度（880／Lmol／L）下，杜氏盐藻荧光参数Fv／Fo、NPQ和叶绿素相对含量均最高，对Cd2＋的耐受性更强；在低磷酸盐摩尔浓度（2．27μtool／L）下，杜氏盐藻的荧光参数（除NPQ外）、细胞密度和叶绿素相对含量均显著低于对照组和高磷处理组，表现为磷限制现象；在高磷酸盐摩尔浓度（290．40μmol／L）下，杜氏盐藻的荧光参数（除NPQ外）、细胞密度和叶绿素相对含量均明显高于低磷处理组和对照组，杜氏盐藻受Cd2＋胁迫程度最小。

英文摘要：

The interaction effects of Cd2＋ , nitriate and phosphate concentration on the growth and chlorophyll fluorescence charteristics of Dunaliella salina were investigated in this paper. The results indicated that Cd2＋ , nitri- ate and phosphate concentration had significant effects on the photosynthesis and growth of Dunaliella salina （P〈0.05）. The fluorescence parameters of Fv/Fm, Fv/Fo, Yield and rETR, cell density and relative chlorophyll content of Dunaliella salina were significant negative correlated with Cd2＋ concentrations after 24 h. And the fluorescence pa~ rameters evidently decreased in Dunaliella salina under low nitriate concentration of 55 μmol/L, and it also caused the decrease of the cell density and relative chlorophyll content. Under high nitriate concentration （7 040 μmol/L）, there was no significant difference in the chlorophyll fluorescence parameters. The fluorescence parameters （Fv/Fo, NPQ）, cell density and relative chlorophyll content of Dunaliella salina got to the greatest values at normal nitriate concentration of 880 μmol/L, and the Dunaliella salina had more tolerance to Cd2＋. The fluorescence parameters （except NPQ）, cell density and relative chlorophyll content of Dunaliella salina remarkably decreased in Dunaliella salina under low phosphate concentration （2.27 μmol/L）, which showed obvious phosphorus limitation. The chloro- phyll fluorescence parameters, cell density and relative chlorophyll content reached the highest values at high phos- phate of 290.40 μmol/L, and the Cd2＋ stress to Dunaliella salina was lowest,