Partitioning of evapotranspiration through oxygen isotopic measurements of water pools and fluxes in a temperate grassland
文献类型：SCI/SSCI论文
| 作者 | Hu Z. M. ; Wen X. F. ; Sun X. M. ; Li L. H. ; Yu G. R. ; Lee X. H. ; Li S. G. |
| 发表日期 | 2014 |
| 关键词 | Evapotranspiration partitioning tunable diode laser oxygen isotope 18O-H2O temperate grassland ecosystem carbon exchange stable-isotopes terrestrial vegetation uncertainty analysis eddy covariance nonsteady state vapor exchange inner-mongolia leaf water evaporation |
| 英文摘要 | Stable isotopic measurements of water provide a promising tool for partitioning of ecosystem evapotranspiration (ET). This approach, however, is still facing some challenges due to the uncertainties in estimating the isotopic compositions of ET and its components. In this study, a tunable diode laser analyzer was deployed for in situ measurements of the oxygen isotopic compositions of water vapor. Using these measurements together with samples of water in plant and soil pools, we partitioned ET via estimating the oxygen isotopic compositions of ET ((ET)) and that of its two components, i.e., plant transpiration ((T)) and soil water evaporation ((E)). A new (T) model was developed in this study, which illustrated consistent estimations with the traditional model. Most of the variables and parameters in the new model can be measured directly with high accuracy, making its potential to be used at other sites high. Our results indicate that the ratio of plant transpiration to evapotranspiration (T/ET) illustrates a U shape diurnal pattern. Mean T/ET at 0630-1830 during the sampling days was 83%. Soil depth of 15 cm is a reasonable depth for soil water sampling for estimating (E) at this site. We also investigated the uncertainties in estimating these three terms and their effects on partitioning. Overall, in terms of partitioning, the uncertainties are relatively small from (T) and (E) but quite large from (ET). Quantifying and improving the precision of (ET) should be a priority in future endeavors of ET partitioning via the stable isotopic approach. Key Points |
| 出处 | Journal of Geophysical Research-Biogeosciences |
| 卷 | 119 |
| 期 | 3 |
| 页 | 358-371 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 2169-8953 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/29830]  |
| 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 | Hu Z. M.,Wen X. F.,Sun X. M.,et al. Partitioning of evapotranspiration through oxygen isotopic measurements of water pools and fluxes in a temperate grassland. 2014. |
入库方式： OAI收割
来源：地理科学与资源研究所
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