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Occurrence of nitrification-denitrification and gaseous nitrogen loss process in flooded rice soil

Progress in Natural Science:Materials International 2007年第1期17卷 6-10页

作者： NI Wuzhong, LI Jianping and ZHU Zhaoliang (College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310029, China College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310029, China Institute of soil Science, Chinese Academy of Sciences, Nanjing 210008, China) [a]Gllege of Environmental and Resmirce Sciences Zheiang University Hangzhou China [b]Gllege of Biosystems Engineering and Food Science Zheiang University Hangzhou China [c]Institute of soil Science Chinese Academy of Sciences Naning China

Flooding in wetland rice fields soon after transplanting results in displacement of soil air (including O2). Thus any dissolved O2 in the pore water is consumed out by microbial respiration in a short period. Supply of O2 to the flooded rice soil is by diffusion of O2 through the standing floodwater and consumption at the soil-water interface, and by exudation of O2 by rice roots and subsequent diffusion of O2 into the rhizosphere. The greater potential consumption of O2 compared to the renewal rate results in the development of distinct soil layers: oxidized soil layers under soil-water interface and in the rhizosphere, and reduced soil layers or reduced bulk soil. Nitrification in oxidized soils and denitrification in reduced soils have been known. Currently, denitrification in oxidized soils, even in standing floodwater, has also been identified. In this article, we present a modified nitrification and denitrification occurring mechanism in flooded rice soil.

关键词： denitrification flooded rice soil gaseous nitrogen loss nitrification.

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