Denitrifying bacteria and hydrogeochemistry in a natural wetland adjacent to farmlands in Chiba, Japan
文献类型：SCI/SSCI论文
| 作者 | Li F. D. ; Zhang Q. Y. ; Tang C. Y. ; Fukumoto K. ; Ota H. |
| 发表日期 | 2011 |
| 关键词 | denitrifying bacteria denitrification hydrogeochemistry wetland dissimilatory nitrate reduction constructed wetlands drinking-water nitrogen transformations isotope fractionation headwater wetland united-states flow paths denitrification groundwater |
| 英文摘要 | This study combined bacterial incubation and hydrogeochemical methods to investigate denitrification in the surface water, top soil (0-20 cm), and shallow groundwater of the Ochi wetland in Japan. Surface water was rich in nitrate (40 mg/l) and denitrifying bacteria (700 per ml). Three functional zones in the wetland were identified in the top soil and shallow groundwater. In the upstream portion of the wetland (Zone I), the counts of denitrifying bacteria in top soil increased from 5200 to 14 970 per ml and nitrate decreased from 25D4 to 1D8 mg/l. Organic carbon concentrations decreased as sulfate increased from 4D0 to 9D6 mg/l in this zone. In the middle-stream of the wetland (Zone II), all concentrations of major anions, iron, organic carbon, and total nitrogen content in top soil were relatively constant, but the counts of denitrifying bacteria increased up to 70 200 per ml. In the downstream portion of the wetland (Zone III), complete removal of nitrate resulted in sharp reduction of counts of denitrifying bacteria. Correspondingly, dissolved oxygen (DO), organic carbon, and total nitrogen increased in this zone. Counts of denitrifying bacteria were lower in shallow groundwater than in top soil; nitrate concentrations in shallow groundwater were also very low in this zone. DO and the oxidation/reduction potential data suggest that groundwater flows to the surface along an extended flow path, thus providing nitrate for the denitrifying community. Copyright. (C) 2011 John Wiley & Sons, Ltd. |
| 出处 | Hydrological Processes |
| 卷 | 25 |
| 期 | 14 |
| 页 | 2237-2245 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 0885-6087 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/23676]  |
| 专题 | 地理科学与资源研究所_历年回溯文献 |
| 推荐引用方式 GB/T 7714 | Li F. D.,Zhang Q. Y.,Tang C. Y.,et al. Denitrifying bacteria and hydrogeochemistry in a natural wetland adjacent to farmlands in Chiba, Japan. 2011. |
入库方式： OAI收割
来源：地理科学与资源研究所
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