过多的氮输入将导致陸域生态系氮饱和 (nitrogen saturation)(Aber et al. 1989)，使原本就是酸性的土壤更为酸化 (van Breemen et al.
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soil nitrogen saturation 土壤氮饱和
nitrogen saturation curve 氮饱和曲线
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；
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.
在本实验条件下，这两种供试植物的光合补偿点和光合饱和点随氮浓度的变化没有表现出规律性。
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