Available N and P have inverse dynamics in that while available N decreases, available P increases, except for Phragmites communis Trin.

• 根际土有效态养分的变化则与全态相反，6种植物的根际土有效氮含量均显著低于非根际土，除芦苇外，根际土有效磷含量均高于非根际土。