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自然生态系统中厌氧氨氧化和反硝化耦合反应研究进展
王宁宁,薛冬梅,王义东,王中良,等
作者单位E-mail
王宁宁 天津师范大学 1191242317@qq.com 
薛冬梅 天津师范大学  
王义东 天津师范大学天津市水资源与水环境重点实验室  
王中良 天津师范大学  
摘要:
厌氧氨氧化和反硝化反应是氮循环系统的两个关键环节,它们对平衡整个生态系统氮的收支,改善水体氮的污染、减少温室气体的排放均具有重要意义。在阐述厌氧氨氧化和反硝化生物反应及微生物学机理的基础上,着重综述了二者在水生和陆地两个生态系统中的耦合反应①探讨了厌氧氨氧化和反硝化反应在不同环境背景下发生的介质及N2的产生速率和贡献比率,发现水生生态系统中厌氧氨氧化对N2产生的贡献率相对陆地生态系统占有较大比重。②分析了调控厌氧氨氧化和反硝化反应的细菌群落和功能基因,反应系统占主导的微生物种类随环境发生变化,其中厌氧氨氧化菌Candidatus brocadia作为主导细菌出现频率较高。③二者耦合过程中的影响因素包括环境因素与底物因素。其中,环境因素中厌氧氨氧化与反硝化耦合的最适pH为6.7~8.3,且溶解氧含量过高时也会对耦合反应产生抑制作用;在底物环境中,有机物含量或C/N过高会促进反硝化作用,但同时也会抑制厌氧氨氧化的发生。建议以后能够加大对于厌氧氨氧化和反硝化耦合反应全球尺度的研究,特别是对于陆地生态系统,还应加深对厌氧氨氧化反应速率与反硝化反应速率之间关系的理论与应用研究。同时,在实际应用中,需要在确定厌氧氨氧化菌和反硝化菌最佳生长基础上,建立耦合体系理论预测数学模型,量化两类功能性微生物的耦合效果。
关键词:  厌氧氨氧化  反硝化  耦合  水生生态系统;陆生生态系统
DOI:
分类号:
基金项目:国家自然科学基金(41203001);天津市高等学校“创新团队培养计划”(TD12-5037);天津市应用基础与前沿技术研究计划(天津市自然科学基金项目) (15JCYBJC49200)
Anammox-denitrification coupling process in a natural ecosystems: Areview
wangningning,WANG yi-dong,王中良,et al
Abstract:
The coupling process of anammox (anaerobic ammonia oxidation) and denitrification plays an important role in natural ecosystems. As a part of the nitrogen cycle, denitrification and anaerobic ammonia oxidation are critical for nitrogen budget, nitrogen pollution improvement and greenhouse gas reduction. This review focuses on the key issues revolved in the coupling process of anammox and denitrification in both aquatic and terrestrial ecosystems : (1) reaction medium, rate and the contribution of N2 in different environmental conditions and the interrelationship,it is found that the contribution of anaerobic ammonia oxidation to N2 production in aquatic ecosystem is greater than that in terrestrial ecosystem; (2) the bacterial community and functional genes of anammox and denitrification that may alter their dominant roles in the changing environment, and Candidatus brocadia had the highest frequency of occurrence ; (3) the influencing factors in the coupling process. In which, the optimum pH of coupling of anammox and denitrification is 6.7 ~ 8.3 in environmental factors, and the coupling reaction will be inhibited when the content of dissolved oxygen is too high; in substrate environment, high organic content or C/N can promote denitrification, but also inhibit anammox. More attention should be paid to the global scale of the coupling reaction of anammox and denitrification , especially in terrestrial ecosystems, which have relatively limited studies at present. It should also deepen its response to the theoretical and practical study on the relationship between the rate of anammox and the rate of denitrification. Moreover, in practice, on the basis of determining the optimum growth of anammox bacteria and denitrifying bacteria, on the basis of determining the optimum growth of anaerobic ammonia-oxidizing bacteria and denitrifying bacteria, a mathematical model of coupling system theory should be established to quantify the coupling effect of two kinds of functional microorganisms.
Key words:  anammox  denitrification  coupling  aquatic ecosystem  terrestrial ecosystem