氮素固定

氮素固定是地球上维持生产力的一个重要生态反应，是继CO2固定之后最重要的生化反应。

Nitrogen fixation is one of important ecological reactions sustaining productive force on the earth , only second to CO_2 fixation .

土壤种类不同，在相同情况，稿杆对土壤氮素固定不同；

That different soil types give rise to the different contents of nitrogen fixation in soils on the condition of same treats .

旱作水稻/花生间作系统中的氮素固定与转移及其对土壤肥力的影响

Biological nitrogen fixation and nitrogen export of groundnut intercropped with rice cultivated in aerobic soil and its effect on soil nitrogen fertility

在一定温度条件下，培养时间越长，稿杆对氮素固定逐渐减少。

That the determined temperature , the longer the culture time is , the smaller the content of nitrogen fixation in is soil is .

麦秸、氮肥与土壤混合培养时氮素的固定、矿化与麦秸的分解

Immobilization and mineralization of nitrogen and decomposition of straw during incubation of soils mixed with wheat straw and nitrogen fertilizer

它们从空气中吸收氮素，将其固定到土壤中。

They take nitrogen out of the air and put it in the soil .