文章摘要
朱树屏,刘卓,向葆卿,王绍然.土壤浸出液、维生素B12及钴对新月尼氏藻Nitzschia Closterium W.Smith生长繁殖的影响[J].水产学报,1964,1(1):19~38
土壤浸出液、维生素B12及钴对新月尼氏藻Nitzschia Closterium W.Smith生长繁殖的影响
EFFECTS OF SOIL EXTRACT,ITS MICROELEMENTS AND DIFFERENT CONCENTRATIONS OF VITAMIN B12 AND COBALT ON THE GROWTH OF NITZSCHIA CLOSTERIUM W.SMITH
  
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朱树屏 水产部侮洋水产研究所海洋生产力研究室 
刘卓 水产部侮洋水产研究所海洋生产力研究室 
向葆卿 水产部侮洋水产研究所海洋生产力研究室 
王绍然 水产部侮洋水产研究所海洋生产力研究室 
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中文摘要:
      自1953年以来,本所对黄渤海区浮游植物与海水化学因子的研究中,发现除了NO3及PO4在水中含量的变化对浮游植物的数量有显著的影响以外,还有一些其他化学因子和浮游植物的生长繁殖有密切关系。我们在近岸海水中加入适量的NO3及PO4,或再加上柠檬酸铁,培养浮游植物有时不能得到满意的结果。
英文摘要:
      The results of eight experiments on the effects of soil extract and its micro-elements as well as of the different concentrations of vitamin B12and cobalt on thegrowth of Nitzschia closterium, in natural and artificial sea water, are presented.The influences of different temperatures and light intensities are also studied. 1. The growth of Nitzschia closterium in natural sea water, enriched with N(NO3) 4 p.p.m., P (PO4) 0.4 p.p.m. and Fe (citrate) 0.04 p.p.m., is greatlyimproved (Table 1, 2nd column) by the addition of asbed soil extract) and furtherimproved by the addition of the organic contents of soil extract as well (Table.1,lst column). This shows that the natural sea water used is deficient in microelementsand organic substances, both of which can be supplemented by proper soil extract. 2. The addition of vitamin B12 5mμg/L [Table 3, (1)] to enriched naturalsea water gives better growths than the addition of ashed soil extract [Table 3, (2)].In different B12 concentrations in enriched natural sea water, best growth occurs inB12 5mμg/L (Fig. 1 2), noticeable deficiency appears in lower concentrationsand inhibitory effect increased in higher concentrations. 3. Optimum growth is obtained in cobalt concentrations 0.5-5μg/L (Fig. 3-5)in enriched natural sea water, while deficiency is observed in lower concentrationsand inhibitory effect in higher concentrations. 4. In artificial sea water without Al, Li, Ba, Cu, Mo Zn, only slightgrowth can be obtained in various cobalt concentrations and growth is comparativelybetter in Co 500μg/L, being less in lower as well as in higher concentrations [Fig.5 6. (A)]. The addition of 0. 1% soil extract makes a remarkable difference[Fig. 5 6, cf. (A) with (B)], and here best growth occurs in Co 0.5-5μg/L(Fig. 5, A; Fig. 6, A B). 5. Inhibitory effect is very remarkable in cobalt concentrations 2,500-5,000μg/L (Fig. 7 8); but with the addition of microelements (Al, Li, Ba, Cu, Mo Zn) the inhibitory effect is greatly lessened (cf. Fig 5 6, A B with Fig.7 8, A, B, C). and may disappear under certain conditions (Fig. 8, A). Thusthe presence of various microelements, such as in artificial sea water "A", may havean effect of neutralizing the inhibitory or harmful effects due to high concentrationsof cobalt, or of other metals as well.At the same time, the presence of various micro-elements in sufficient quantitics may also relief, in one way or another, the demandor the effect of deficiency of Co (Fig. 7-10), or of some other metals as well. 6. At the presence of sufficient various microelements (such as in artificialsea water "A"), the optimum concentration of B12, 5mμg/L (Fig. 1) may have aninhibitory effect (cf. Fig. 11, A with Fig. 9, A) on growths in all The cobaltconcentrations tested (Fig. 11) and the inhibitory effect is greater in higher cobaltconcentrations (5-500μg/L). 7. In natural sea water, the eontents of B12 and Co vary from very deficientquantities to within the optimum range shown by these experiments. The presenceof various microelements and organic substances in various quantities may havevarious influences on the effect of B12, Co or some other substances on the growthof phytoplanktonic organisms. All these substances are continuously enriched innatural sea water, in the form of natural soil extract washed to rivers and hence tothe sea, as land drainage. They are also continuously produced in the sea by livingorganisms and chemical activities using substances contained in this natural soilextract. Thus the mechanism controlling the growth of marine phytoplankton is verycomplicated and further research in this field is urgently needed.
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