Hydrochemistry measurements and diazotroph abundances

Microbial dinitrogen (N2) fixation, the nitrogenase enzyme-catalysed reduction of N2 gas into biologically available ammonia, is the main source of new nitrogen (N) in the...微生物二氮（N₂）固定作用（Microbial dinitrogen fixation），即由固氮酶（nitrogenase）催化将N₂气体还原为可被生物利用的氨，是……中新增氮素（N）的主要来源。