前沟藻(Amphidinium hoefleri)和角刺藻(Chaetoceros gracilis)二甲基硫生产的实验研究

用实验室模拟的方法着重研究硅藻的角刺藻（Ｃｈａｅｔｏｃｅｒｏｓｇｒａｃｉｌｉｓ）和浮游甲藻的前沟藻（Ａｍｐｈｉｄｉｎｉｕｍｈｏｅｆｌｅｒｉ）生长过程中ＤＭＳ的生产及不同氮营养条件下对前沟藻ＤＭＳ生产的影响．结果表明：（１）前沟藻和角刺藻都可以生产二甲基硫（ＤＭＳ），但２者ＤＭＳ生产能力有很大差别，前沟藻ＤＭＳ平均生产率大约是角刺藻的１００倍．（２）不同生理阶段的ＤＭＳ产量不同．对数增长期的前沟藻细胞释放ＤＭＳ的能力最强，其ＤＭＳ速率是指数增长期的３倍．静止期和衰老期的前沟藻细胞ＤＭＳ的生产能力下降．（３）低氮条件对前沟藻细胞ＤＭＳ有促进作用．其中低浓度组（０．５ｍｇ／ＬＮａＮＯ３）ＤＭＳ产率是高浓度组（５０ｍｇ／Ｌ）的４倍．

A Study on DMS Producing by Marine Algae, Chaetoceros gracilis and Amphidinium hoefleri

The production of Dimethylsulfide(DMS) during Chaetoceros gracilis and Amphidinium hoefleri growing period is discussed by the laboratory simulation in this paper.The conclusions are:(1)Both Amphidinium hoefleri and Chaetoceros gracilis can produce DMS,but their production abilities are different.The average DMS production rate of Amphidinium hoefleri is about 100 times than that of Chaetoceros gracilis. (2)In different physiological stages of phytoplankton the DMS production rates are different.The Amphidinium hoefleri cell in the log stage produces the largest amount of DMS,which is about three times than that of exponential stage.The cell in the senescent stage produces less DMS.(3)Low nitrate level could stimulate DMS production of Amphidinium hoefleri cell.DMS production rate of cell in the lower NaNO 3 concentration (0 5mg/L) is four times than that of the higher NaNO 3 concentration (50mg/L).