Water, heat fluxes and water use efficiency measurement and modeling above a farmland in the North China Plain
文献类型：SCI/SSCI论文
| 作者 | Yu Q. |
| 发表日期 | 2005 |
| 关键词 | water vapor flux CO2 flux water use efficiency RZ-SHAW model maize North China Plain surface-temperature layer soil evapotranspiration variability strategies vegetation exchange flow |
| 英文摘要 | Net radiation (R-n), water vapor flux (LE), sensible heat flux (H-s) and soil heat flux (G) were measured above a summer maize field with the eddy-covariance technique, simulation and analysis of water, heat fluxes and crop water use efficiency were made with the RZ-SHAW model at the same time in this study. The results revealed significant diurnal and seasonal variability of water vapor flux for summer maize. Most part of Rn was consumed by the evapotranspiration of the summer maize. The proportion of water vapor flux to net radiation ((LE/R-n) increased with the crop development and peaked around milk-filling stage with a value of 60%, a slightly lower than that obtained by the RZ-SHAW model. Daily evapotranspiration estimated by the model agreed with the results measured with the eddy-covariance technique, indices of agreement (IA) for hourly water vapor fluxes simulated and measured were above 0.75, root mean square errors (RMSE) were no more than 1.0. Diurnal patterns of H-s showed the shape of inverted "U" shifted to the forenoon with a maximum value around 11:30 (Beijing time), while LE exhibited an inverted "V" with a maximum value at around 13:00, about an hour later than H, Diurnal change of CO2 showed an asymmetrical "V" curve and its maximal rates occurred at about 11:30. Variations of water use efficiency during the phonological stages of the summer maize showed a rapid increase with the photosynthetic photon flux density (PPFD) after sunrise, a state of equilibrium around 10:00 followed a decrease. Maximum values of water use efficiency were 24.3, and its average value ranged from 7.6 to 10.3 g kg(-1). |
| 出处 | Science in China Series D-Earth Sciences |
| 卷 | 48 |
| 页 | 207-217 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 1006-9313 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/23167]  |
| 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.. Water, heat fluxes and water use efficiency measurement and modeling above a farmland in the North China Plain. 2005. |
入库方式： OAI收割
来源：地理科学与资源研究所
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