海水中铁的几种形态对海生小球藻生长的影响

通过实验室一次性培养 ,研究不同形态的铁 :Fe3 + ,Fe2 + ,Fe3 + - EDTA,Fe2 + - EDTA以及胶体水合氧化铁在不同条件下对海生小球藻 (Chlorella vulgaris)生长的影响。实验结果表明 ,铁对小球藻生长影响的主要生物活性形式是有机络合态铁和胶体水合氧化铁 ,光诱导还原态 Fe2 + 也很重要。它们都积极促进了藻类的生长繁殖 ,其中 EDTA与铁离子结合的动力学过程并不明显影响藻类吸收铁。小球藻相对生长率的提高和叶绿素 A(Chl.a)的增加取决于铁的总量及其转变为可利用状态的速率 *和藻类的有效吸收。在不同的培养体系中 ,常量营养盐 N、P与 Fe的缺乏对藻类生长起着交互限制作用 ,其中缺 P比缺 N更能减少 EDTA络合铁对小球藻生长繁殖的促进作用。

Effects of Various Iron Forms on the Growth of Chlorella vulgaris in Seawater

The effects of various iron speciations: Fe 3+ ,Fe 2+ ,Fe 3+ EDTA,Fe 2+ EDTA and Fe(OH) 3 x x on the growth of Chlorella vulgarize were studied by laboratory simulation. The results show that the dissolved organic ligands of Fe and the dissolved hydrous ferric oxide colloids are the bioavailability species of Fe for algae growth, during which the light induced reduction species Fe 2+ is also important. The increase of relative growth values and the growth of chlorophyll a are mainly dependent on the dissociate rate of Fe oxohydroxo's species which can be transferred into availabile form and on the bio reactive absorption. The effects of N , P and Fe deficiency on the growth of algae can be mutual restrictive, P deficient media weakened the influence of Fe EDTA on the growth of algae more than N deficient media.