Nitrous oxide emissions from grazed grassland as affected by a nitrification inhibitor, dicyandiamide, and relationships with ammonia-oxidizing bacteria and archaea
文献类型：会议论文
| 作者 | Cameron, Keith C.; Di, Hong J.; Sherlock, Rob R.; Shen, Ju-Pei; He, Ji-Zheng; Winefield, Chis S. |
| 出版日期 | 2010 |
| 会议日期 | OCT 10-14, 2009 |
| 会议地点 | Zhejiang Univ, Hangzhou, PEOPLES R CHINA |
| 关键词 | Ammonia-oxidizing Archaea (Aoa) Ammonia-oxidizing Bacteria (Aob) Dicyandiamide Grazed Grassland Greenhouse Gas Nitrification Inhibitor Nitrous Oxide |
| DOI | 10.1007/s11368-009-0174-x |
| 英文摘要 | Nitrous oxide (N(2)O) is a potent greenhouse gas and, in grazed grassland systems where animals graze outdoor pastures, most of the N(2)O is emitted from animal urine nitrogen (N) deposited during grazing. Recently, ammonia-oxidizing archaea (AOA) were found to be present in large numbers in soils as well in the ocean, suggesting a potentially important role for AOA, in addition to ammonia-oxidizing bacteria (AOB), in the nitrogen cycle. The relationship between N(2)O emissions and AOB and AOA populations is unknown. The objective of this study was to determine the quantitative relationship between N(2)O emissions and AOB and AOA populations in nitrogen-rich grassland soils. We determined N(2)O emissions and the abundance and activity of AOB and AOA in four different soils as affected by the applications of animal urine N and dicyandiamide (DCD) as a nitrification inhibitor. Relationships were then determined between N(2)O emissions and the AOB and AOA populations. Total N(2)O emissions from the urine N applied at 1,000 kg N ha(-1) varied significantly in these soils, from 13.9 to 39.8 kg N(2)O-N ha(-1). The DCD treatment reduced these N(2)O emissions to between 2.8 and 15.3 kg N(2)O-N ha(-1). The average emission factor of the urine N (EF(3)) was 2.2% and this was decreased to 0.8%, representing a 64% reduction. Total N(2)O emissions were significantly related to the amoA gene copy numbers of the AOB population and to the amount of nitrate-N in the soil, but not related to the abundance of AOA. These results demonstrate that the N(2)O flux is mainly associated with the dynamics of the AOB population rather than the AOA in these nitrogen-rich grassland soils, and therefore, it is the AOB that should be the target of inhibition when mitigating N(2)O emissions using nitrification inhibitors. |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/24644]  |
| 专题 | 生态环境研究中心_土壤环境科学实验室 |
| 推荐引用方式 GB/T 7714 | Cameron, Keith C.,Di, Hong J.,Sherlock, Rob R.,et al. Nitrous oxide emissions from grazed grassland as affected by a nitrification inhibitor, dicyandiamide, and relationships with ammonia-oxidizing bacteria and archaea[C]. 见:. Zhejiang Univ, Hangzhou, PEOPLES R CHINA. OCT 10-14, 2009. |
入库方式： OAI收割
来源：生态环境研究中心
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