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本文系统研究了温度变化(12、18和24℃)对两种典型定鞭藻(大洋桥石藻Gephyrocapsa oceanica、球等鞭金藻Isochrysis galbana)胞内颗粒有机质C∶N∶P(POC、PON、POP)含量与比值的影响。结果表明，尽管升温对两种定鞭藻POC、PON、POP含量与比值无显著影响，但其对两种微藻的影响具有一定的规律。升温总体导致两种微藻胞内POC、PON、POP含量下降(4%～25%),其中大洋桥石藻胞内POC和PON含量较高、球等鞭金藻胞内POP含量较高。升温总体导致两种微藻POC∶PON下降(～14%)、PON∶POP升高(～20%)、POC∶POP几乎无变化。本研究量化了温度变化对海洋典型定鞭藻胞内POC、PON、POP含量与比值的影响，为深入理解全球气候变化背景下定鞭藻对海洋碳循环的反馈效应具有重要意义。
Abstract：As sea surface temperature continues to rise, the growth and chemical composition of marine phytoplankton change clearly. Haptophytes is a key phytoplankton group in marine ecosystems. Typical species of haptophytes can photosynthesize and calcify simultaneously, driving marine carbon cycle. To date, most studies have focused on physiological changes of Emiliania huxleyi, while simultaneous studies on C∶N∶P stoichiometry of particulate organic matters(POC, PON, and POP) in various haptophytes are still scarce. In this study, the effect of temperature(12, 18 and 24 ℃) on the per-contents and molar ratios of POC, PON and POP in typical haptophytes(Gephyrocapsa oceanica and Isochrysis galbana) were tested.Overall, although warming had no significant effect on per-contents and molar ratios of POC, PON and POP in both species, its effect on the two species showed certain patterns. Specifically, warming reduced per-cell contents of POC, PON and POP(4%～25%) in both species. Per-cell contents of POC and PON were higher in G. oceanica, while per-cell contents of POP were higher in I. galbana. Warming resulted in a decrease in POC∶PON(～14%), an increase in PON∶POP(～20%), and no clear changes in POC∶POP in both species.This study quantifies the effect of temperature on per-contents and molar ratios of POC, PON and POP in typical haptophytes, which is of great significance for a better understanding of the feedback of haptophytes on marine carbon cycle in the context of global climate change.
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基本信息:
DOI：10.16441/j.cnki.hdxb.20240067
中图分类号:Q948.8;P73
引用信息:
[1]崔家璇,秦肖,涂佳敏,等.温度变化对典型海洋定鞭藻有机质C∶N∶P的影响[J].中国海洋大学学报(自然科学版),2025,55(03):45-54.DOI:10.16441/j.cnki.hdxb.20240067.
基金信息:
崂山实验室科技创新项目(LSKJ202204005)资助~~