Ammonium fixation by clay minerals in different layers of two paddy soils after flooding |
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| Authors: | Y S Zhang H W Scherer |
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| Institution: | (1) Department of Soil Science and Agrochemistry, Zheijiang University, Hangzhou, 310029, People's Republic of China, CN;(2) Institute of Agrochemistry, University of Bonn, Meckenheimer Allee 176, D-53115 Bonn, Germany, DE |
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| Abstract: | The influence of flooding and cellulose addition on the fixation of NH4
+ in different soil layers of two paddy soils from China (an entisol and an ultisol) was investigated. In both soils the content
of total reducing substances (TRS) sharply increased during the first days after flooding and was highest in the anoxic layers.
This increase, which was more pronounced in the entisol with the higher total C content, was accompanied by an increase in
the concentration of non-exchangeable NH4
+ in both soils. The increase in mineralization after flooding, resulting in higher concentrations of exchangeable NH4
+, favoured the fixation of NH4
+. Although the application of cellulose resulted in higher TRS contents, the fixation of NH4
+ ions decreased, which may have been the result of microbiological N immobilization.
Received: 29 April 1998 |
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| Keywords: | Non-exchangeable ammonium Paddy soils Redox potential Organic substance Nitrogen immobilization |
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