Fate of N-15 labeled nitrate and ammonium salts added to an alpine meadow in the Qinghai-Xizang Plateau, China
文献类型：SCI/SSCI论文
| 作者 | Xu X. L. ; Ouyang H. ; Pei Z. Y. ; Zhou C. P. |
| 发表日期 | 2003 |
| 关键词 | alpine meadow soil microorganisms retention of deposited N percentage of N-15 recovery fate of NO3--N-15 and NH4+-N-15 microbial biomass nitrogen northern hardwood forest direct extraction soil microorganisms competition california grassland plants carbon |
| 英文摘要 | To understand the dynamics of added nitrogen (N) in alpine meadow and the role of alpine plants and soil microorganisms in the retention of deposited N, the fate of N-15 labeled nitrate and ammonium salts was determined in an alpine meadow for two months. Two weeks after N-15 application, total recovery of N-15 from NO3--N-15 was 73.5% while it was 78% from NH4+-N-15. More N-15 was recovered in plants than in soil organic matter or in microbial biomass, irrespective of forms of N added. After one month, 70.6% of added NO3--N-15 and 57.4% of NH4+-N-15 were recovered in soils and plants. N-15 recovered in soil organic matter decreased greatly while that recovered in plants varied little, irrespective of the form N. Compared with the results of two weeks after N-15 application, more NO3--N-15 than NH4+-N-15 was recovered in microbial biomass. Total recovery was 58.4% (six weeks) and 67% (eight weeks) from NO3--N-15, and 43.1% and 49% from NH4+-N-15, respectively. Both plants and soil microorganism recovered more NO3--N-15 than NH4+-N-15. But plants recovered more N-15 than soil microorganisms. During the whole experiment plants retained more NO3--N and N-15 than soil microorganisms while N-15 recovered in inorganic N pool did not exceed 1% due to lower amount of inorganic N. This indicates that plants play more important roles in the retention of deposited N although microbial biomass can be an important sink for deposited N in early days after N application. |
| 出处 | Acta Botanica Sinica |
| 卷 | 45 |
| 期 | 3 |
| 页 | 276-281 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 1672-6650 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/22652]  |
| 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 | Xu X. L.,Ouyang H.,Pei Z. Y.,et al. Fate of N-15 labeled nitrate and ammonium salts added to an alpine meadow in the Qinghai-Xizang Plateau, China. 2003. |
入库方式： OAI收割
来源：地理科学与资源研究所
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