A modeling investigation of canopy-air oxygen isotopic exchange of water vapor and carbon dioxide in a soybean field
文献类型：SCI/SSCI论文
| 作者 | Yu Q. |
| 发表日期 | 2010 |
| 关键词 | global 3-dimensional model energy-balance closure elevated co2 gradient leaf water atmospheric co2 (coo)-o-18 discrimination terrestrial vegetation stomatal conductance mechanistic model tree thermometers |
| 英文摘要 | The oxygen isotopes of CO(2) and H(2)O ((18)O-CO(2) and (18)O-H(2)O) provide unique information regarding the contribution of terrestrial vegetation to the global CO(2) and H(2)O cycles. In this paper, a simple isotopic land surface model was used to investigate processes controlling the isotopic exchange of (18)O-H(2)O and (18)O-CO(2) between a soybean ecosystem and the atmosphere. We included in a standard land surface model a nonsteady state theory of leaf water isotopic composition, a canopy kinetic fractionation factor, and a big-leaf parameterization of the (18)O-CO(2) isoforcing on the atmosphere. Our model simulations showed that the Peclet effect was less important than the nonsteady state effect on the temporal dynamics of the water isotopic exchange. The model reproduced the highly significant and negative correlation between relative humidity and the ecosystem-scale (18)O-CO(2) isoforcing measured with eddy covariance. But the model-predicted isoforcing was biased high in comparison to the observations. Model sensitivity analysis suggested that the CO(2) hydration efficiency must have been much lower in the leaves of soybean in field conditions than previously reported. Understanding environmental controls on the hydration efficiency and the scaling from the leaf to the canopy represents an area in need of more research. |
| 出处 | Journal of Geophysical Research-Biogeosciences |
| 卷 | 115 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 0148-0227 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/22749]  |
| 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 | Yu Q.. A modeling investigation of canopy-air oxygen isotopic exchange of water vapor and carbon dioxide in a soybean field. 2010. |
入库方式： OAI收割
来源：地理科学与资源研究所
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