| 摘要: |
| 2001年5月通过实验室培养的方法研究了长江口优势赤潮浮游植物种类———中肋骨条藻(Skeletonema costatum)在长江口海水中的生长情况。实验结果显示 ,在实验光强范围内该藻相对生长速率常数随光强的减小而减小 ,表明光照的可得性是影响其生长的重要因素 ;悬浮体的遮光效应会限制其生长 ,海水盐度超出其适宜生长的范围也会对其的生长产生不利影响。两个相互对比的实验说明在泥沙含量很高的长江口咸淡混合水中光照的可得性和盐度均影响中肋骨条藻的生长 ,综合这两个因素 ,在实验盐度范围内最适宜中肋骨条藻生长的盐度是约为19.2的咸淡水 ,适于中肋骨条藻适宜生长的盐度为14～23。 |
| 关键词: 长江口 中肋骨条藻(Skeletonema costatum) 光照 悬浮体 |
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| 基金项目:中国科学院知识创新工程项目(KZCX2-207,KZCX2-206) ;国家“973”项目(2001CB409703) |
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| Effect of turbid water in Changjiang(Yangtze) estuary on the growth of Skeletonema costatum |
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| Abstract: |
| Concentration of suspended particles is very high in Changjiang estuary, and obviously effected on the growth of phytoplankton. We carried out an experiment to study the influence of turbid water in the estuary on the growth of Skeletonema costatum in May 2001. The results showed that, in our experimental light intensity range increasing illumination increased the growth rate. So the sunlight is the main factors control the growth of phytoplankton. The particles in the seawater could shade the sunlight obviously, and limit the growth of Skeletonema costatum. When salinity of seawater exceeds the adaptable range negative effect would occur on the growth. Considering the two factors of salinity and light, the most favorable seawater for Skeletonema costatum is less salty freshwater area with salinity of about 19.2, and the adaptable salinity was between 14 ～ 23 for the growth of Skeletonema costatum. |
| Key words: Changjiang(Yangtze) estuary Skeletonema costatum light freshwater |
