Nitrogen and carbon source-sink relationships in trees at the Himalayan treelines compared with lower elevations
文献类型：SCI/SSCI论文
| 作者 | Li M. H. ; Xiao W. F. ; Shi P. L. ; Wang S. G. ; Zhong Y. D. ; Liu X. L. ; Wang X. D. ; Cai X. H. ; Shi Z. M. |
| 发表日期 | 2008 |
| 关键词 | altitudinal limit carbon limitation C-balance C-N ratio growth limitation non-structural carbohydrates starch sugars pinus-cembra trees growth-limitation swiss treeline temperature co2 responses seedlings photosynthesis carbohydrate acclimation |
| 英文摘要 | No single hypothesis or theory has been widely accepted for explaining the functional mechanism of global alpine/arctic treeline formation. The present study tested whether the alpine treeline is determined by (1) the needle nitrogen content associated with photosynthesis (carbon gain); (2) a sufficient source-sink ratio of carbon; or (3) a sufficient C-N ratio. Nitrogen does not limit the growth and development of trees studied at the Himalayan treelines. Levels of non-structural carbohydrates (NSC) in trees were species-specific and site-dependent; therefore, the treeline cases studied did not show consistent evidence of source/carbon limitation or sink/growth limitation in treeline trees. However, results of the combined three treelines showed that the treeline trees may suffer from a winter carbon shortage. The source capacity and the sink capacity of a tree influence its tissue NSC concentrations and the carbon balance; therefore, we suggest that the persistence and development of treeline trees in a harsh alpine environment may require a minimum level of the total NSC concentration, a sufficiently high sugar:starch ratio, and a balanced carbon source-sink relationship. |
| 出处 | Plant Cell and Environment |
| 卷 | 31 |
| 期 | 10 |
| 页 | 1377-1387 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 0140-7791 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/23631]  |
| 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 M. H.,Xiao W. F.,Shi P. L.,et al. Nitrogen and carbon source-sink relationships in trees at the Himalayan treelines compared with lower elevations. 2008. |
入库方式： OAI收割
来源：地理科学与资源研究所
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