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[1]GAO Guanlong,ZHANG Xiaoyou,ZHU Ping,et al.Diurnal Variation of Evapotranspiration of Sophora alopecuroides L. Under Extreme Dry Condition[J].Research of Soil and Water Conservation,2015,22(05):279-283.

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Diurnal Variation of Evapotranspiration of Sophora alopecuroides L. Under Extreme Dry Condition

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 22 Number of periods: 2015 05 Page number: 279-283 Column: Public date: 2015-10-28

Title:: Diurnal Variation of Evapotranspiration of Sophora alopecuroides L. Under Extreme Dry Condition

Author(s):: GAO Guanlong^1,2, ZHANG Xiaoyou¹, ZHU Ping^1,2, ZHAO Hong³; 1. Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China;
3. Zhejiang Ruiqi Testing Technology Co., Ltd., Hangzhou 310000, China

Keywords:: extreme dry condition; Sophora alopecuroides L.; evapotranspiration; diurnal variation

CLC:: Q948

DOI:: -

Abstract:: We made use of the data which were measured by the Bowen Ratio-equilibrium Energy Method and measured the evapotranspiration and energy flux of Sophora alopecuroides L., analyzed the features of diurnal variation of evapotranspiration and energy equilibrium. The results showed that: (1) at different stages of growth of sophora alopecuroides L. and in different seasons, the evapotranspiration rate varied widely, the diurnal variation showed a bimodal type in July, while it was a unimodal type in the rest months; (2) the diurnal variation of evapotranspiration rate of Sophora alopecuroides L. was obvious under the clear and cloudless term, the curve trend was bimodal or unimodal, the evapotranspiration rate in the evening was negative and the atmospheric condensation process proceeded; (3) under the clear and cloudless term, the peak types of diurnal variations of evapotranspiration rate were the same as net radiation and heat flux; (4) with the increase of solar radiation, the temperature and the vapor pressure rose, the evapotranspiration enhanced. It also enhanced when the wind speed increased. The variation trend of diurnal variation of evapotranspiration was the same as the variation of soil temperature. The influence of environmental factors on evapotranspiration rate in turn is the order: variation of soil temperature > vapor pressure above canopy > temperature > wind speed.

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