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

doi:10.12068/j.issn.1005-3026.2020.02.021

Abstract

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

CLC Number:

S154.1

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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