中文摘要：

通过对比未添加秸秆和添加秸秆情景下潮土和砂姜黑土对氨氮的等温吸附实验,探讨秸秆还田对土壤氨氮热力学吸附性质的影响,为氮素在土壤垂向迁移转化过程中发生的吸附反应提供科学参考.研究表明：1砂姜黑土对氨氮的吸附能力要强于潮土,吸附能力主要与土壤的黏粒含量有关.2在实验设定的浓度范围内,未添加秸秆和添加秸秆的所有样品的吸附等温线均能用Henry吸附等温模型和Freundlich吸附等温模型拟合.同时,Langmuir吸附等温模型可以更好地拟合未添加秸秆以及少量添加秸秆的样品.3添加秸秆的混合样品相对于土壤样品降低了对氨氮的吸附效率和吸附容量.未添加秸秆的土样对氨氮的吸附效率KH的平均值为41.88L·kg-1,饱和吸附量qm的平均值为823.85 mg·kg-1;少量添加秸秆的混合样对氨氮吸附效率KH的平均值为21.29L·kg-1,饱和吸附量qm平均值为732.06 mg·kg-1;大量添加秸秆的混合样对氨氮的吸附效率平均值为13.99L·kg-1.

英文摘要：

In this paper we investigated the impact of straw returning to the ammonia nitrogen thermodynamic adsorption properties of soils,in order to offer reference for study on transport and transformation of nitrogen in soil.We have conducted ammonia nitrogen isothermal adsorption experiments in alluvial soil and black clay soil,with and without straw.The results are as follows：1）The ammonia nitrogen adsorptive ability of the black clay soil is higher than that of the alluvial soil,which is primarily related to the clay content in the soil.2）Within the concentrationrange of our experiments,with or without the straw addition,the adsorption isotherms of all samples fit Henry and Freundlich adsorption isotherm models.Meanwhile,Langmuir adsorption isotherm model also fits the experimental isotherms well when a small amount of or no straw is added.3）Straw-mixing soil has lower efficiencies and capacities of ammonia nitrogen adsorption in the experiments.When no straw is added,the average adsorption efficiency（KH）is41.88L·kg-1;the average maximum adsorption capacity（qm）is 823.85mg·kg-1.When a little straw is added,the average adsorption efficiency（KH）is 21.29L·kg-1;the average maximum adsorption capacity（qm）is 732.06 mg·kg-1.When a lot of straw is added,the average adsorption efficiency（KH）of is 13.99L·kg-1.