Quantifying the effects of advection on canopy energy budgets and water use efficiency in an irrigated wheat field in the North China Plain
文献类型：SCI/SSCI论文
| 作者 | Yu Q. |
| 发表日期 | 2007 |
| 关键词 | energy balance advection Priestley Taylor parameter canopy-air temperature difference canopy water use efficiency priestley-taylor parameter central great plains stomatal conductance local advection balance closure winter-wheat evapotranspiration evaporation microclimate surface |
| 英文摘要 | Competing demands for water with increasing population calls for developing strategies for increasing the crop water use efficiency (WUE) of irrigated crops, especially in the semiarid regions of the world. In this context, it is important to quantify the various factors that control the WUE of irrigated crops in these regions. Advection is an important factor that can have significant effects on the energy exchange in irrigated fields of and regions, and hence control the crop canopy WUE (CWUE). An eddy covariance system was applied to measure water and heat fluxes and then to quantify advection in an irrigated winter wheat filed at the Yucheng Integrated Experiment Station, Chinese Academy of Sciences in the North China Plain (NCP) (36 degrees 57'N, 116 degrees 36'E, 28 m a.s.l.) in 2004. Priestley-Taylor parameter and canopy-air temperature differences were employed to identify the occurrence of advection. Effects of advection on canopy energy budgets and CWUE were examined by computing the equilibrium and advective evapotranspiration. It was found that enhanced advection occurs when the crop canopy-air temperature differences are negative or when the Priestley-Taylor parameter takes on values > 1.5. Due to enhanced advection, the percentage of latent and sensible heat flux exchange contribution to the total water loss from the fields through evapotranspiration can exceed 50%, and CWUE decreased remarkably. Advection in the experiments probably resulted from drier soil regimes in the upwind areas. (c) 2007 Elsevier B.V. All rights reserved. |
| 出处 | Agricultural Water Management |
| 卷 | 89 |
| 期 | 1-2 |
| 页 | 116-122 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 0378-3774 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/23635]  |
| 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.. Quantifying the effects of advection on canopy energy budgets and water use efficiency in an irrigated wheat field in the North China Plain. 2007. |
入库方式： OAI收割
来源：地理科学与资源研究所
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