nitrogen concentration gradient 氮浓度梯度
nitrogen transformation and concentration gradient 氮的形态转化及浓度分布
With the depth of canopy increases, leaf nitrogen content reduces gradually, thus vertical nitrogen gradient develops.
作物冠层中叶片氮素含量沿冠层从上向下逐渐减少，形成了氮素的垂直分布梯度。
Slope gradient has many impacts on soil erosion by water and mineral nitrogen loss in an erosion process.
坡度是影响坡面水土流失和土壤养分流失过程的重要因素。
The principle and status of the separation of nitrogen and oxygen from air by high-gradient magnetic field are introduced briefly.
介绍了高梯度磁场氮氧分离的原理及技术现状。
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