海洋微藻光合作用对CO_2加富的响应特征

Response characteristics of photosynthesis to CO_2 enrichment in marine microalgae

采用实验生态学的方法,研究了中肋骨条藻、赤潮异弯藻和小球藻的叶绿素a含量、光合速率、光合固碳速率和碳酸酐酶活性对CO2加富的响应变化。结果表明:3种海洋微藻的叶绿素a含量对CO2加富处理都没有作出明显的响应变化(P>0.05)。相反,3种海洋微藻的光合速率、光合固碳速率和碳酸酐酶活性对CO2加富都作出了明显的响应变化,与对照组相比显著提高(P<0.05)。说明CO2加富处理刺激了3种海洋微藻的碳酸酐酶活性,从而提高了它们的光合速率和光合固碳速率。3种海洋微藻相比,赤潮异弯藻的响应最明显,其次是中肋骨条藻,小球藻的响应相对最不明显。

The response changes of chlorophyll a content,photosynthetic rate,photosynthetic assimilation rate of carbon and carbonic anhydrase activity to CO2 enrichment were studied in Skeletonema costatum,Heterosigma akashiw and Chlorella sp.by the experimental ecology methods.The results showed that the chlorophyll a content in the three species of marine microalgae did not exhibit notable response changes to enrichment CO2,and the chlorophyll a content under Enrichment CO2 conditions had not the obvious difference compared with control group（P〉0.05）.However,the photosynthetic rate,photosynthetic assimilation rate of carbon and carbonic anhydrase activity in the three species of marine microalgae were increased remarkably（P〈0.05）.Among S.costatum,H.akashiw and Chlorell.sp,H.akashiw was most sensitive to enrichment CO2,and Chlorella sp.was relatively insensitive.The results showed that CO2 enrichment could stimulate an increase of carbonic anhydrase activity,and further lead to the increases of photosynthetic rate and photosynthetic assimilation rate of carbon in the three species of marine microalgae.