| Occurrence of nitrification-denitrification and gaseous nitrogen loss process in flooded rice soil |
| |
| 作者姓名： | NI Wuzhong LI Jianping ZHU Zhaoliang |
| |
| 作者单位： | 1. College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310029, China; 2. College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310029, China; 3. Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China |
| |
| 基金项目： | Supported by National Natural Science Foundation of China(Grant No．30390080) |
| |
| 摘 要： | 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. |
Occurrence of nitrification-denitrification and gaseous nitrogen loss process in flooded rice soil |
| |
| Authors: | NI Wuzhong LI Jianping ZHU Zhaoliang |
| |
| Institution: | 1. College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310029, China; 2. College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310029, China; 3. Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China |
| |
| Abstract: | 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. |
| |
| Keywords: | denitrification flooded rice soil gaseous nitrogen loss nitrification |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《自然科学进展》浏览原始摘要信息 |
| 点击此处可从《自然科学进展》下载免费的PDF全文 |
|
