Stable Water Use Efficiency of Tibetan Alpine Meadows in Past Half Century: Evidence from Wool delta C-13 Values
文献类型：SCI/SSCI论文
| 作者 | Yang H.; He, N. P.; He, Y. T.; Li, S. G.; Shi, P. L.; Zhang, X. Z. |
| 发表日期 | 2015 |
| 关键词 | carbon-isotope discrimination inner-mongolia global distribution atmospheric co2 typical steppe climate china photosynthesis vegetation grassland |
| 英文摘要 | Understanding the influences of climatic changes on water use efficiency (WUE) of Tibetan alpine meadows is important for predicting their long-term net primary productivity (NPP) because they are considered very sensitive to climate change. Here, we collected wool materials produced from 1962 to 2010 and investigated the long-term WUE of an alpine meadow in Tibet on basis of the carbon isotope values of vegetation (delta C-13(veg)). The values of delta C-13(veg) decreased by 1.34% during 1962-2010, similar to changes in delta C-13 values of atmospheric CO2. Carbon isotope discrimination was highly variable and no trend was apparent in the past half century. Intrinsic water use efficiency (W-i) increased by 18 mu mol.mol(-1) (approximately 23.5%) during 1962-2010 because the increase in the intercellular CO2 concentration (46 mu mol.mol(-1)) was less than that in the atmospheric CO2 concentration (C-a, 73 mu mol.mol(-1)). In addition, Wi increased significantly with increasing growing season temperature and C-a. However, effective water use efficiency (W-e) remained relatively stable, because of increasing vapor pressure deficit. C-a, precipitation, and growing season temperature collectively explained 45% of the variation of W-e. Our findings indicate that the W-e of alpine meadows in the Tibetan Plateau remained relatively stable by physiological adjustment to elevated C-a and growing season temperature. These findings improve our understanding and the capacity to predict NPP of these ecosystems under global change scenarios. |
| 出处 | Plos One |
| 卷 | 10 |
| 期 | 12 |
| 语种 | 英语 |
| ISSN号 | 1932-6203 |
| DOI标识 | 10.1371/journal.pone.0144752 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/43589]  |
| 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 H.,He, N. P.,He, Y. T.,et al. Stable Water Use Efficiency of Tibetan Alpine Meadows in Past Half Century: Evidence from Wool delta C-13 Values. 2015. |
入库方式： OAI收割
来源：地理科学与资源研究所
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