氮稳定同位素技术在陆地生态系统氮循环研究中的应用

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方运霆^1,^2,^3,^*(

),刘冬伟^1,^2,³,朱飞飞^1,^2,³,图影^1,^3,⁴,李善龙^1,²,黄韶楠^1,^3,⁴,全智^1,^2,³,王盎^1,^2,³

Applications of nitrogen stable isotope techniques in the study of nitrogen cycling in terrestrial ecosystems

FANG Yun-Ting^1,^2,^3,^*(

),LIU Dong-Wei^1,^2,³,ZHU Fei-Fei^1,^2,³,TU Ying^1,^3,⁴,LI Shan-Long^1,²,HUANG Shao-Nan^1,^3,⁴,QUAN Zhi^1,^2,³,WANG Ang^1,^2,³

图1. 氮循环过程中的同位素分馏效应(¹⁵ε, ‰, 修改自Denk et al., 2017)。英文字母代表生态系统氮循环过程: a, 矿化作用; b,硝化作用; c, 反硝化作用; d, 生物固氮; e, NH₃和NH₄⁺同位素交换; f, 硝酸盐异化还原成铵作用; g, 微生物固定; h, 植物吸收; i, 厌氧氨氧化作用; j, NH₃挥发。

Fig. 1. Isotope fractionation effects in nitrogen processes (¹⁵ε, ‰, modified by Denk et al., 2017). Processes involved in terrestrial ecosystem N cycling are: a, mineralization; b, nitrification; c, denitrification; d, biological N₂ fixation; e, isotope exchange between NH₃ and NH₄⁺; f, dissimilatory nitrate reduction to ammonium; g, immobilization by microbes; h, plant uptake; i, anaerobic ammonia oxidation; j, NH₃ volatilization. SOM, soil organic matter.