地球科学进展 ›› 2024, Vol. 39 ›› Issue (2): 157 -168. doi: 10.11867/j.issn.1001-8166.2024.010

综述与评述 上一篇    下一篇

有氧水环境中藻类产生甲烷的研究进展
于晓涵 1 , 2( ), 李哲 1 , 2, 肖艳 1 , 2( ), 袁翰卿 1 , 2 , 3, 李清 1 , 2 , 3   
  1. 1.中国科学院重庆绿色智能技术研究院, 中国科学院水库水环境重点实验室, 重庆 400714
    2.中国科学院大学重庆学院, 重庆 400714
    3.重庆交通大学 河海学院, 重庆 400074
  • 收稿日期:2023-10-23 修回日期:2024-01-22 出版日期:2024-02-10
  • 通讯作者: 肖艳 E-mail:yuxiaohan@cigit.ac.cn;yxiao@cigit.ac.cn
  • 基金资助:
    国家自然科学基金项目(51979262);重庆市自然科学基金项目(cstc2020jcyj-jqX0010)

Advances of Algal Methane Production in Oxic Aquatic Environment

Xiaohan YU 1 , 2( ), Zhe LI 1 , 2, Yan XIAO 1 , 2( ), Hanqing YUAN 1 , 2 , 3, Qing LI 1 , 2 , 3   

  1. 1.Key Laboratory of Reservoir Aquatic Environment, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China
    2.Chongqing School, University of Chinese Academy of Sciences, Chongqing 400714, China
    3.The College of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, China
  • Received:2023-10-23 Revised:2024-01-22 Online:2024-02-10 Published:2024-03-05
  • Contact: Yan XIAO E-mail:yuxiaohan@cigit.ac.cn;yxiao@cigit.ac.cn
  • About author:YU Xiaohan, Master student, research area includes algal physiology and ecology. E-mail: yuxiaohan@cigit.ac.cn
  • Supported by:
    the National Natural Science Foundation of China(51979262);Chongqing Natural Science Foundation(cstc2020jcyj-jqX0010)

自然水体是重要的甲烷排放来源,传统观点认为甲烷是微生物在严格厌氧条件下利用有机物的最终产物,但越来越多的证据表明有氧水环境中存在甲烷过饱和现象,被称为“甲烷悖论”。近年的研究表明,上述现象的产生与藻类的存在息息相关。藻类不仅可以通过光合作用或利用甲基化前体物质直接产生甲烷,也可为其他微生物提供厌氧微环境以及前体物质间接促进甲烷生成。然而,针对藻类有氧产甲烷的微生态机制方面的研究尚存不足,也使得全球甲烷收支核算仍存在较大不确定性。未来,进一步突破藻类有氧产甲烷的分子调控机理、揭示藻类对外部条件响应的有氧产甲烷特征及其生理适应性机制,将是深化领域研究的重要方向。

Aquatic ecosystems are a significant source of methane emissions. Although methane production has previously been recognized to only occur in oxygen-deprived environments, recent research has shown that aerobic water environments also experience high methane levels, known as the “methane paradox”. This phenomenon is linked to the presence of algae that can directly produce methane through photosynthesis or the use of specific compounds. Moreover, algae create conditions conducive to methane production by other microorganisms. However, the specific ecological mechanism of aerobic methane production by algae remains not yet fully understood, making accurate global methane level accounting difficult. Future studies should focus on uncovering the molecular regulation of aerobic methane production by algae and how they adapt to external conditions.

中图分类号: 

表1 含氧海水中与藻类相关的 CH4 含量及其主要来源
Table 1 Algae-related methane concentrations in oxic seawaters and its main sources
表2 含氧湖水中与藻类相关的 CH4 含量及其主要来源
Table 2 Algae-related methane concentrations in oxic lake waters and its main sources
图1 不同藻类(阴影部分)与其他物种CH4 产率的比较 28 - 30
深蓝色、浅蓝色和橙色分别代表自海洋、淡水和土壤环境中分离的藻类;绿色代表非藻类真核生物;紫色代表产甲烷菌。藻类部分中斜线填充部分代表藻类利用甲基膦酸酯(Methylphosphonate,MPn)产生CH 4,未填充部分代表光合作用过程中产生CH 4
Fig. 1 Comparison of CH4 production rates between different algaeshadingand other species 28 - 30
Dark blue, light blue and orange represent algae isolated from marine, freshwater and soil environments, respectively; green represents non-algal eukaryotes; and purple represents methanogens. In the shadow part, the oblique filling part represents the algae using MPn to produce CH 4, and the unfilled part represents the CH 4 produced during photosynthesis
图2 生命系统中ROS驱动的CH4 形成的拟议机制 51 - 52
DMSP为二甲基巯基丙酸内盐;DMS为二甲基硫;TMA为三甲胺;ROS为活性氧
Fig. 2 Proposed mechanism of ROS-driven CH4 formation in living systems 51 - 52
DMSP is dimethylsulfoniopropionate; DMS is dimethyl sulfide; TMA is trimethylamine; ROS is Reactive Oxygen Species
图3 细胞内固氮酶产生CH4 的可能代谢途径 61
ATP为三磷酸腺苷,ADP为二磷酸腺苷;(a)细胞以硫代硫酸盐作为电子源、碳酸氢盐作为碳源;(b)细胞以乙酸盐作为电子源和碳源;S 2O 3 2 - 为硫代硫酸盐;HCO 3 - 为碳酸氢盐;CH 3COO -为乙酸盐
Fig. 3 Possible metabolic pathways of CH4 production by intracellular nitrogenase 61
ATP: Adenosine Triphosphate, ADP: Adenosine Diphosphate; (a) Cells grown with thiosulfate as electron source and bicarbonate as carbon source; (b) Cells grown with acetate as electron source and carbon source; S 2O 3 2 - is thiosulfate; HCO 3 - is bicarbonate; CH 3COO - is acetate
图4 含氧水柱中与藻类相关的CH4 生物地球化学过程
MPn为甲基膦酸酯;DMSP为二甲基巯基丙酸内盐;ROS为活性氧
Fig. 4 Algae-related methane biogeochemical processes in oxygenated water column
MPn is methylphosphonate; DMSP is dimethylsulfoniopropionate; ROS is Reactive Oxygen Species
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