Effects of nitrogen,phosphorus, iron and silicon on growth of five species of marine benthic diatoms |
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| Affiliation: | 1. College of Fisheries and Life Science, Dalian Ocean University, Dalian 116023, China;2. Key Laboratory of Hydrobiology in Liaoning Province, Dalian 116023, China;1. State Key Laboratory of Earth Processes and Resource Ecology/School of Geography, Beijing Normal University, Beijing 100875, China;2. School of Life Science, Beijing Normal University, Beijing 100875, China;3. Biotechnology Research Institute, China Academy of Agriculture Science, Beijing 100081, China;1. Institute of Marine Biology, National Taiwan Ocean University, Keelung 202, Taiwan, ROC;2. Institute of Marine Environmental Chemistry and Ecology, National Taiwan Ocean University, Keelung 202, Taiwan, ROC;3. Center of Excellence for the Oceans, National Taiwan Ocean University, Keelung 202, Taiwan, ROC;1. Jiaozhou Bay Marine Ecosystem Research Station, Institute of Oceanology, Chinese Academy of Sciences, 7 Nanhai Road, Qingdao 266071, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China;4. Center for Ocean Mega-Science, Chinese Academy of Science, Qingdao 266071, China |
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| Abstract: | The effects of nitrogen, phosphorus, iron and silicon on growth of five species of marine benthic diatoms, namely Navicula patrickae, Nitzschia panduriformis, Navicula thienemannii, Nitzschia longissima and Navicula atomus were studied by single factor experiments and the optimal concentration ratios of the four nutrient elements beneficial for diatoms growth were screened out separately using the L9 (34) orthogonal design. The results highlighted that nitrogen, phosphorus, iron and silicon all had highly significant effects on growth of five diatoms while the diatoms growth rates reached the highest averagely in the 2nd to the 6th culture day. In addition, the optimal concentrations (mg/L) of four nutrients suitable for diatoms growth were found higher than that in f/2 medium except that Nitzschia longissima had the same concentration of nitrogen as that in f/2 medium which is optimal for growth. Moreover, the optimal growth concentrations of four elements for five diatoms varied in the range of 12.36–74.16 mg/L for nitrogen, 1.70–3.98 mg/L for phosphorus, 2.00–4.00 mg/L for iron, 23.01–69.03 mg/L for silicon, respectively. By means of the orthogonal test of four nutrients for five benthic diatoms, the optimal concentration ratios N:P:Fe:Si (mg/L) were obtained as follows: 74.16:2.27:3.33:23.01 for N. patrickae; 37.08:3.98:4.00:11.50 for N. panduriformis; 49.44:3.98:3.33:34.51 for N. thienemannii; 12.36:1.70:4.00:11.50 for N. longissima; 74.16:2.27:4.00:69.03 for N. atomus. |
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