Chlorophyll and nitrogen content can be increased to increase nitrogen level, but there is a saturation phenomenon.
叶绿素总量和叶片含氮量随氮素水平的提高而增加，但当继续提高氮素水平时，有饱和趋势；
2
Under this experiment condition, the light compensation point and light saturation point of the two species didn't show regularity with the change in nitrogen concentration in water.