Vegetation and Soil N-15 Natural Abundance in Alpine Grasslands on the Tibetan Plateau: Patterns and Implications
文献类型：SCI/SSCI论文
| 作者 | Yang Y. H. ; Ji C. J. ; Robinson D. ; Zhu B. ; Fang H. J. ; Shen H. H. ; Fang J. Y. |
| 发表日期 | 2013 |
| 关键词 | carbon:nitrogen ratio climate isotope nitrogen cycle soil delta N-15 soil texture vegetation delta N-15 foliar nitrogen isotopes precipitation gradient global patterns rain-forest carbon availability plant delta-n-15 dynamics china |
| 英文摘要 | The natural abundance of nitrogen (N) stable isotopes (delta N-15) has the potential to enhance our understanding of the ecosystem N cycle at large spatial scales. However, vegetation and soil delta N-15 patterns along climatic and edaphic gradients have not yet been fully understood, particularly for high-altitude ecosystems. Here we determined vegetation and soil delta N-15 in alpine grasslands on the Tibetan Plateau by conducting four consecutive regional surveys during 2001-2004, and then examined their relationships with both climatic and edaphic variables. Our results showed that both vegetation and soil N in Tibetan alpine grasslands were more N-15-enriched than global averages. Vegetation delta N-15 did not exhibit any significant trend along the temperature gradient, but decreased significantly with an increase in precipitation amount. In contrast, soil delta N-15 did not vary with either mean annual temperature or precipitation. Our results also indicated that soil delta N-15 exhibited a slight increase with clay content, but decreased with soil carbon:nitrogen ratio. A general linear model analysis revealed that variations in vegetation delta N-15 were dominantly determined by climatic variables, whereas soil delta N-15 was related to edaphic variables. These results provide clues for potential climatic and edaphic regulations on ecosystem N cycle in these high-altitude regions. |
| 出处 | Ecosystems |
| 卷 | 16 |
| 期 | 6 |
| 页 | 1013-1024 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 1432-9840 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/30102]  |
| 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 | Yang Y. H.,Ji C. J.,Robinson D.,et al. Vegetation and Soil N-15 Natural Abundance in Alpine Grasslands on the Tibetan Plateau: Patterns and Implications. 2013. |
入库方式： OAI收割
来源：地理科学与资源研究所
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