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硝化作用
environ.
nitrificação
(氨水混合物,包括人造肥料、由有机物或者动植物源提供的腐殖质,被转换为亚硝酸盐而后是硝酸盐,其被吸收作为庄稼营养物的过程。过量硝酸盐可浸入地表水和地下水而引起污染。过量硝酸盐可能通过微生物转变为氮气,它是一种重要的温室气体,并且释放进入大气。生态系统中的氮的重要来源是空气中的分子氮。在有限的程度之上,一些溶解在水里。不过,没有在岩石里发现氮。)
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