This inhibiting effect was due chiefly to the concentration of combined nitrogen.
化合态氮的抑制作用与浓度密切相关。
When the simulation model combined with GIS, it was easy to evaluate regional soil nitrogen behaviors under different treatments of water and nitrogen.
结果表明，通过模型计算与地理信息系统相结合，便于评价不同水氮管理、不同降雨年型条件下区域农田土壤水、氮素行为。
It will also combine with oxygen to form oxides of nitrogen and, when combined with hydrogen in the presence of catalysts, will form ammonia.
它还会同氧反应生成氮的氧化物，而且当在有催化剂存在时它会同氢反应生成氨。
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