Calcification response of Pleurochrysis carterae to iron concentrations in batch incubations: implication for the marine biogeochemical cycle
Calcification response of Pleurochrysis carterae to iron concentrations in batch incubations: implication for the marine biogeochemical cycle
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分批培养中侧金藻对铁浓度的钙化反应：对海洋生物地球化学循环的影响
DOI：
10.1007/s11707-016-0629-5
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发表时间：
2017-11
影响因子：
2
通讯作者：
Wei Jie
中科院分区：
文献类型：
--
作者：
Zou Xiang;Sun Shiyong;Lin Sen;Shen Kexuan;Dong Faqin;Tan Daoyong;Nie Xiaoqin;Liu Mingxue;Wei Jie
钙化的球石生物体是一组分布广泛的海洋微藻，以位于细胞表面的球石的形式产生生物方解石。利用卡氏拟球藻的批量培养，我们研究了这种钙化过程对铁浓度的响应，将初始培养基中铁的供应从正常浓度改变为1ppm(百万分之一)、5ppm和10ppm。对细胞数量、无机碳(球藻)和有机碳(有机细胞成分)产量的随时间变化的测量表明，增加生长介质中的铁供应，通过增加光合作用活性和钙化作用促进生长，从而促进碳的固定。此外，获得的随时间变化的UV-Vis和FT-IR光谱表明，铁肥促进球石钙化伴随着从方解石到文石或非晶相的晶相转变。我们的结果表明，铁浓度对球藻生物体的海洋碳循环有显著影响。
Calcified coccolithophores, a diverse and widely distributed group of marine microalgae, produce biogenic calcite in the form of coccoliths located on the cell surface. Using batch incubations of the coccolithophorid Pleurochrysis carterae, we investigated the responses of this calcification process to iron concentrations by changing the iron supply in the initial culture media from a normal concentration to 1 ppm (parts per million), 5 ppm, and 10 ppm. Time-dependent measurements of cell population, production of inorganic carbon (coccoliths), and organic carbon (organic cellular components) showed that elevated iron supply in the growth medium of P. carterae stimulates carbon sequestration by increasing growth along enhanced photosynthetic activity and calcification. In addition, the acquired time-dependent UV-Vis and FT-IR spectra revealed that iron fertilization-enhanced coccolith calcification is accompanied by a crystalline phase transition from calcite to aragonite or amorphous phase. Our results suggest that iron concentration has a significant influence on the marine carbon cycle of coccolithophores.
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