秸秆还田对土壤氨氮热力学吸附性质的影响研究

南京大学学报(自然科学版) ›› 2016, Vol. 52 ›› Issue (1): 46–55.

秸秆还田对土壤氨氮热力学吸附性质的影响研究

王朝炜1,2，朱愿福1,2，李荣富1,2，阮晓红1,2,，刘丛强3*

出版日期:2016-01-27 发布日期:2016-01-27
作者简介:(1. 南京大学表生地球化学教育部重点实验室,南京,210046;2. 南京大学地球科学与工程学院水科学系,南京,210046;3. 中国科学院地球化学研究所,环境地球化学国家重点实验室,贵阳,550002)
基金资助:
基金项目:国家自然科学基金重点项目(41230640),国家水体污染控制与治理科技重大专项(2012ZX07204-003)
收稿日期:2015-12-05
*通讯联系人,E-mail:liucongqiang@vip.skleg.cn,ruanxh@nju.edu.cn

Impact of straw-returning to characteristic of ammonia nitrogen thermodynamic adsorption in soils

Wang Chaowei1,2, Zhu Yuanfu1,2, Li Rongfu1,2, Ruan Xiaohong1,2*, Liu Congqiang3*

Online:2016-01-27 Published:2016-01-27
About author:(1. Department of Water Science, School of Earth Sciences and Engineering, Nanjing University, Nanjing, 210046, China; 2. MOE Key Laboratory of Surficial Geochemistry, Nanjing University, Nanjing 210046, China; 3. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China)

摘要/Abstract

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41.88 L·kg-1，饱和吸附量qm的平均值为823.85mg·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21.29 L·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13.99 L·kg-1。

Abstract: 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 concentration range 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) is 41.88 L·mg-1; the average maximum adsorption capacity (qm) is 823.85 mg·kg-1. When a little straw is added, the average adsorption efficiency (KH) is 21.29 L·mg-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 13.99 L·mg-1.

王朝炜1,2，朱愿福1,2，李荣富1,2，阮晓红1,2,，刘丛强3*. 秸秆还田对土壤氨氮热力学吸附性质的影响研究[J]. 南京大学学报(自然科学版), 2016, 52(1): 46–55.

Wang Chaowei1,2, Zhu Yuanfu1,2, Li Rongfu1,2, Ruan Xiaohong1,2*, Liu Congqiang3*. Impact of straw-returning to characteristic of ammonia nitrogen thermodynamic adsorption in soils[J]. Journal of Nanjing University(Natural Sciences), 2016, 52(1): 46–55.

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