pH对米氏凯伦藻(Karenia mikimotoi)种群生长、营养吸收及无机碳亲和力的影响

Effects of pH limitation on population growth,nutrient uptake and photosynthesis physiological processes of Karenia mikimotoi

随着海水酸化以及沿海赤潮爆发诱发水体p H的上升,p H对海洋藻类生理生态影响逐渐为人类所关注。本实验以东海常见赤潮藻——米氏凯伦藻(Karenia mikimotoi)为研究对象,研究不同p H对其生理状态的影响。结果显示,p H对米氏凯伦藻的生长、营养吸收、叶绿素、光合速率以及对无机碳的亲和力存在显著影响。当p H=6.2时,米氏凯伦藻的生长受到抑制,细胞生长速率,营养盐吸收率,最大光合速率以及对无机碳的亲和力都最低;当p H=8.2时,细胞的生长最快,对营养盐的吸收也最快而且最大光合速率达到最高;p H=7.2和9.2时,藻细胞能维持较高的生长,且对无机碳的亲和力高于p H=8.2实验组。总而言之,过高或过低的p H胁迫会引起米氏凯伦藻生理状态的不良变化,尤其当p H过低时米氏凯伦藻生理状态受到严重影响。

with the acidification and increased pH caused by the outbreak of red tides in coastal water, the effects of pH on the marine algae physiological and ecological impact have caused human＇ s concern gradually. In this experi- ment, we use Karenia mikimotoi as research object to study the effects on its physiological state in different pH. The re- suits showed that pH significantly affect the growth, nutrient absorption, chlorophyll concentration, photosynthetic rate and affinity for inorganic carbon of the alga K. mikimotoi. When pH = 6.2,the cell growth was inhibited. Growth rate, nutrient absorption, maximum photosynthetic rate and affinity for inorganic carbon are the lowest; When pH = 8.2, the growth of cells, absorption of nutrients and highest maximum photosynthetic rate are the fastest ; pH = 7.2 and 9.2, the algal cells can still maintain higher growth and higher affinity for inorganic carbon is larger than those in pH = 8.2. In short, high or low pH stress can cause adverse changes in the physiological state of the alga K. mikimotoi, especially when the pH is too low.