黄菖蒲根际低分子量有机酸对土壤吸附氨氮的影响

doi:10.12068/j.issn.1005-3026.2020.02.021

东北大学学报:自然科学版 ›› 2020, Vol. 41 ›› Issue (2): 269-274.DOI: 10.12068/j.issn.1005-3026.2020.02.021

黄菖蒲根际低分子量有机酸对土壤吸附氨氮的影响

李海波，赵孝明，李英华，陈熙

(东北大学资源与土木工程学院，辽宁沈阳110819)

收稿日期:2019-04-08 修回日期:2019-04-08 出版日期:2020-02-15 发布日期:2020-03-06
通讯作者: 李海波
作者简介:李海波(1974-)，男，河北承德人，东北大学教授，博士生导师; 李英华(1979-)，女，辽宁灯塔人，东北大学教授，博士生导师.
基金资助:
国家自然科学基金资助项目(51578115，41571455).

Effects of LMWOAs of Iris Pseudacorus L. Rhizosphere on Ammonia Nitrogen Adsorption of Soil

LI Hai-bo， ZHAO Xiao-ming， LI Ying-hua， CHEN Xi

School of Resources & Civil Engineering， Northeastern University， Shenyang 110819， China.

Received:2019-04-08 Revised:2019-04-08 Online:2020-02-15 Published:2020-03-06
Contact: LI Ying-hua
About author:-
Supported by:
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摘要/Abstract

摘要： 根际低分子量有机酸是一类活性的化感物质，具有促进污染物迁移、转化与累积等重要的生态功能.本研究利用GC-MS技术，解析了黄菖蒲根际代谢物的组分特征与相对含量，通过模拟实验揭示了低分子量有机酸对土壤吸附氨氮的热-动力学的影响.结果表明:黄菖蒲根际代谢的不同种类低分子量有机酸均能促进氨氮吸附，但作用程度存在差异; 氨氮在土壤中的吸附动力学符合Elovich方程与双常数方程，等温吸附均符合Langmuir和Freundlich方程的特征，其键能常数K_L与有机酸解离常数pKa呈负相关; 低分子量有机酸调控土壤吸附氨氮的机理主要是有机质活化作用.

关键词: 黄菖蒲, 根际代谢物, 低分子量有机酸, 土壤调控, 氨氮吸附

Abstract: Low molecular weight organic acid(LMWOA) of rhizosphere is a kind of active allelochemical， which has such important ecological functions as promoting the migration， transformation and accumulation of pollutants. The GC-MS technology was applied to analyze the composition characteristics and relative content of the rhizosphere metabolites of Iris Pseudacorus L.. The simulation experiments were carried out to reveal the thermo-dynamic effects of the LMWOA on the soil adsorption of ammonia nitrogen. The results showed that different types of LMWOAs could promote the adsorption of ammonia nitrogen， but the degree of action is different. The adsorption kinetics of ammonia nitrogen of soil matches the Elovich equation and the double constant equation， and the isothermal adsorption complies with the characteristics of the Langmuir and Freundlich equations. Its bond energy constant K_L is significantly correlated with the organic acid dissociation constant pKa， and the mechanism of LMWOA regulation of soil adsorption of ammonia nitrogen is mainly the activation of organic matters.

Key words: objective, interval particle, intervalIris Pseudacorus L., rhizosphere metabolites, low molecular weight organic acid, soil regulation, ammonia nitrogen adsorption

中图分类号:

S154.1

李海波，赵孝明，李英华，陈熙. 黄菖蒲根际低分子量有机酸对土壤吸附氨氮的影响[J]. 东北大学学报:自然科学版, 2020, 41(2): 269-274.

LI Hai-bo， ZHAO Xiao-ming， LI Ying-hua， CHEN Xi. Effects of LMWOAs of Iris Pseudacorus L. Rhizosphere on Ammonia Nitrogen Adsorption of Soil[J]. Journal of Northeastern University Natural Science, 2020, 41(2): 269-274.

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黄菖蒲根际低分子量有机酸对土壤吸附氨氮的影响

Effects of LMWOAs of Iris Pseudacorus L. Rhizosphere on Ammonia Nitrogen Adsorption of Soil

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