在厌氧条件下，硝酸盐和亚硝酸盐通过脱硝作用被还原。
Under anaerobic conditions nitrates and nitrites are both reduced by a process called denitrification.
土壤氮状况是一个固氮、微生物分解、硝酸化和脱氮过程的作用。
The soil nitrogen status is a function of the processes of nitrogen fixation, microbial decompostion, nitrificattion and denitrification.
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