下辽河平原水稻田土中氨氮吸附/解吸动力学

Ammonia absorption/desorption behavior in paddy soil from lower position of liao river plain

实验研究下辽河平原4个典型区域水稻土中氨氮吸附／解吸的情况，并进行模型拟合验证．结果表明：各剖面土样对氨氮吸附量均随时间的增加而逐渐增大，吸附时间基本为15--20min，ExpAssoc模型对氨氮吸附动力学曲线拟合效果较好．各剖面土样均呈现解吸量随时间的增加逐渐变慢，解吸时间基本为3～5h，在时间上，吸附时间要比解吸时间快18倍左右，Asymptoticl模型对氨氮解吸动力学曲线拟合效果较好．

This paper did a research on Ammonia absorption/desorption behavior in paddy soil from four typical areas in Lower Position of Liao River Plain, and presented a model and its fit-test. The result shows that the Ammonia absorption amount for every profiles of soil sample increases with the time, and the absorption time is about 15-20min, and ExpAssoc model fits better for curves of Ammonia absorption behavior. The Ammonia desorption slows down with the time in all soil sample and the desorption time is about 3-5h. In terms of time, the desorption time is about 18 times as long as that of absorption, and Asymptoticl model fits better for curves of ammonia desorption behavior.