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首页> 外文期刊>Agricultural Water Management >Vineyard evaporative fraction based on eddy covariance in an arid desert region of Northwest China.
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Vineyard evaporative fraction based on eddy covariance in an arid desert region of Northwest China.

机译：基于涡度协方差的中国西北干旱荒漠区葡萄园蒸发分数

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摘要

Studying farmland evaporative fraction (EF) plays an important role in interpreting the components of energy budget and evapotranspiration (ET). The present study examines the pattern of vineyard EF after monitoring energy components by eddy covariance for 2 years, and estimates the crop ET by EF in the arid desert region of Northwest China. Main results indicate that EF during daytime is nearly constant on sunny days when the available energy exceeds 200 W m-2, but EF becomes relatively unsteady when the available energy is lower than 200 W m-2. Furthermore, daytime average EF is relatively low in the early growth stage, nearly constant in the mid-later stage, and significantly reduced in the later stage; Moreover, mean EF in different periods of daytime is in good agreement with daytime average EF, mean EF during 10:00-15:00 h is relatively close to daytime average EF and mean EF during 14:00-15:00 h is approximately equal to daytime average EF. The estimated daytime ET from mean EF during 14:00-15:00 h is highly correlated to the measured ET by Bowen ratio-energy balance though the value is partially underestimated. This study demonstrated that daytime ET can be estimated from midday EF and the relationship can be used to guide irrigation practice in the arid region.
机译：对农田蒸发分数（EF）的研究在解释能源预算和蒸散量（ET）的组成部分方面起着重要作用。本研究在通过涡度协方差监测能量成分2年后检查了葡萄园EF的模式，并估计了EF在中国西北干旱沙漠地区的农作物ET。主要结果表明，当可用能量超过200 W m-2时，晴天的白天EF几乎恒定，但是当可用能量低于200 W m-2时EF变得相对不稳定。此外，白天的平均EF在生长期初期相对较低，在后期中期几乎保持恒定，而在后期则显着降低。此外，白天不同时段的平均EF与白天平均EF高度一致，10：00-15：00 h期间的平均EF相对接近于白天平均EF，而14：00-15：00 h期间的平均EF大约为等于日平均EF。尽管该值被部分低估了，但从14：00-15：00时的平均EF估计的白天ET与通过Bowen比-能量平衡测得的ET高度相关。这项研究表明，可以从中午EF估算白天的ET，并且该关系可以用来指导干旱地区的灌溉实践。

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