Correlations between net primary productivity and foliar carbon isotope ratio across a Tibetan ecosystem transect
文献类型：SCI/SSCI论文
| 作者 | Zhang L.; Zhang L. |
| 发表日期 | 2009 |
| 关键词 | water-use efficiency leaf-area index canopy photosynthesis nitrogen allocation natural-abundance rainfall gradient alpine gradients atmospheric co2 life-span discrimination |
| 英文摘要 | Warming climate could affect leaf-level carbon isotope composition (delta(13)C) through variations in photosynthetic gas exchange. However, it is still unclear to what extent variations in foliar delta(13)C can be used to detect changes in net primary productivity (NPP) because leaf physiology is only one of many determinants of stand productivity. We aim to examine how well site-mean foliar delta(13)C and stand NPP co-vary across large resource gradients using data obtained from the Tibetan Alpine Vegetation Transects (1900-4900 m, TAVT). The TAVT data indicated a robust negative correlation between foliar delta(13)C and NPP across ecosystems (NPP=-2.7224 delta(13)C-67.738, r(2)=0.60, p < 0.001). The mean foliar delta(13)C decreased with increasing annual precipitation and its covariation with mean temperature and soil organic carbon and nitrogen contents. The results were further confirmed by global literature data. Pooled delta(13)C data from global literature and this study explained 60% of variations in annual NPP both from TAVT-measures and MODIS-estimates across 67 sites. Our results appear to support a conceptual model relating foliar delta(13)C and nitrogen concentration (N(mass)) to NPP, suggesting that: 1) there is a general (negative) relationship between delta(13)C and NPP across different water availability conditions; 2) in water-limited conditions, water availability has greater effects on NPP than N(mass); 3) when water is not limiting, NPP increases with increasing N(mass). |
| 出处 | Ecography |
| 卷 | 32 |
| 期 | 3 |
| 页 | 526-538 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 0906-7590 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/23323]  |
| 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 | Zhang L.,Zhang L.. Correlations between net primary productivity and foliar carbon isotope ratio across a Tibetan ecosystem transect. 2009. |
入库方式： OAI收割
来源：地理科学与资源研究所
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