酸盐调节高CO2对Gracilariopsis lemaneiformis中碳分区的影响:颗粒物和溶解有机碳封存之间的权衡
Jichen Chen1, Chi Song1, Yicheng Ke1
1State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University, Xiamen, 361005, China.
Environmental research
|September 20, 2025
概括
高度的二氧化碳抑制了大藻类的生长和碳固定. 最佳的酸盐含量对于管理碳捕获和减轻碳捕获宏藻种植的负面影响至关重要.
科学领域:
- 海洋生物技术和碳捕获
- 大藻对环境压力的生理和分子反应.
背景情况:
- 微藻被研究为碳捕获,但宏藻提供更容易的收获和更低的成本.
- 对于宏观藻类的高二氧化碳固定和封存能力的了解有限.
- 格拉西拉里西斯 (Gracilariopsis lemaneiformis) 是一种候选物种,可以用于碳封存应用.
研究的目的:
- 为了研究Gracilariopsis lemaneiformis对高二氧化碳度 (10%) 的生理和分子反应,在不同酸盐的可用性下.
- 评估高二氧化碳和酸盐对碳固定,封存和溶解有机碳生产的影响.
- 为了确定藻种植的最佳条件,以便有效地从烟气中捕获碳.
主要方法:
- 在低 (8微米) 和高 (200微米) 酸盐度下培养Gracilariopsis lemaneiformis,高10%的CO2.
- 测量特定增长率 (SGR),净颗粒有机碳 (POC) 生产和光合作用效率.
- 分析溶解有机碳 (DOC),耐火DOC (RDOC),并进行基因表达的转录基因分析.
主要成果:
- 高二氧化碳 (10%) 抑制了SGR和净POC生产,增加了DOC和RDOC的积累.
- 高酸盐 (HN) 增强了光合作用颜料和含量,但加剧了CO2对生长和POC的抑制.
- 转录组分析显示,在高CO2下,参与碳固定,同化和代谢的基因受到广泛的下调,在高CO2和高酸盐联合下进一步下调.
结论:
- 高二氧化碳 (10%) 降低了宏藻的碳固定净值,但增加了溶解有机碳的释放.
- 酸盐的可用性调节了这些影响,高酸盐可能会在高CO2下加剧碳不平衡.
- 最佳的二氧化碳 (<10%) 和酸盐 (<200μM) 度建议用于用于烟气碳捕获的宏藻种植.
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