chang with
NH4 adsorbing-desorbing equilibrium time and reaction rate,equilibrium adsorbing-desorbing capacity and adsorbing equilibrium constants changed with the soil clay content and CEC.
研究表明：（1）NH4＋吸附、解吸平衡时间及反应速率,平衡时的吸附、解吸量及吸附平衡常数均随土壤粘粒和CEC不同而变化；
Prices usually vary with the quality.
价格常随品质不同而变化.