Nutrient compositions of cultured Thalassiosira rotula and Skeletonema costatum from the Jiaozhou Bay in China
Nutrient compositions of cultured Thalassiosira rotula and Skeletonema costatum from the Jiaozhou Bay in China
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中国胶州湾养殖圆状海链藻和中肋骨条藻的营养成分
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2008
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对胶州湾两种常见的不同大小的浮游植物圆海链藻和中肋骨条藻的碳、氮、磷、硅组成进行了测定。细胞内碳、氮、磷、硅含量均较低。T. rotula比S.中肋骨条藻细胞干重中氮、磷、硅含量显著低于中肋骨条藻;圆突的平均值低于S.肋骨S.中肋骨条的含量显著高于T. rotula，尤其是硅，前者是后者的6.4倍，表明S.中肋骨条能更好地吸收这些元素。尤其是S。中肋骨条藻对硅的吸收具有竞争优势，这有利于中肋骨条藻成为胶州湾相对缺硅区的主要优势种。胶州湾实验室培养的浮游植物和不同粒径悬浮颗粒物（主要是浮游植物）的营养盐比值存在一定的差异，这是由于环境变化造成的。两种硅藻和不同粒径悬浮颗粒物中碳、氮含量高，磷、硅含量低，氮磷摩尔比高（远高于Redfield值），硅磷比和硅氮比低（远低于Redfield值），与海水中的结果一致。胶州湾海水和浮游植物中硅含量相对较低，表明硅可能对胶州湾浮游植物的生长有影响。
Carbon, nitrogen, phosphorus, silicon composition of cultured two different sized phytoplankton common species of Thalassiosira rotula and Skeletonema costatum from the Jiaozhou Bay were measured. Carbon, nitrogen, phosphorus, silicon contents in cell were. obvious higher in T. rotula than in S. costatum, but the percents of nitrogen, phosphorus, silicon contents in cell dry mass in T. rotula were lower than those in S. costatum. The dry mass concentrations of nitrogen,phosphorus,silicon in S. costatum were much higher than those in T. rotula, particularly silicon, the former was 6.4 times of the latter, showing that S. costatum could more assimilate these elements. Especially, S. costatum had competitive dominance for assimilating silicon, which is beneficial to its becoming a major dominant species in relative short silicon of the Jiaozhou Bay. There were some differences in numerical value of nutrient ratios both laboratory-cultured phytoplankton and different sized suspended particulates (mainly phytoplankton) in the Jiaozhou Bay, which was caused by the changes of environment. High contents of carbon, nitrogon and relative low phosporus,silicon, high molar ratio of nitrogen to phosphorus (far higher than Redfield value) and low ratio of silicon to phosphorus and silicon to nitrogen (far lower than Redfield values) in the two diatoms and different sized suspended particulates were consistent with those in the seawater. Relative short silicon in the seawater and phytoplankton showed that silicon was possibly affectting phytoplankton growth in the Jiaozhou Bay.