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| Evapotranspiration Simulation of the Grassland and Sensitivity Analysis in Tianlaochi Catchment in the Upper Reaches of Heihe River |
| Gao Yunfei, Zhao Chuanyan, Peng Shouzhang, Ma Wenying, Li Wenjuan, Yuan Yapeng |
| State Key Laboratory of Grassland Agro-ecosystems, School of Life Science, Lanzhou University, Lanzhou 730000, China |
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Abstract Tianlaochi catchment in the upper reaches of Heihe River was selected as a study area. The study object was subalpine grassland. According to the observation date of the outdoor weather station, five evapotranspiration models such as Penman, FAO-Penman, FAO-Penman-Monteith, Priestley-Taylor, and FAO-Radiation were used to simulate the daily and hourly evapotranspiration. Comparing the simulated values with the observed values, we selected the best model in the study area. In addition, we made the sensitivity analysis of relevant parameters. From the study, the results show that FAO-Penman-Monteith model is the best on day scale, and other three models (i.e., Penman, FAO-Penman, and Priestley-Taylor) are also good, FAO-Radiation model is bad; Priestley-Taylor model is the best one on hour scale, other four models are not suitable for estimating hourly evapotranspiration in the grassland of the study area, the order of the input parameters significantly influencing evapotranspiration is radiation>air pressure>air humidity>air temperature>wind speed. When the radiation changes 10%, the simulation values change about 20% and when other parameters change 10%, the simulation values change less than 8%. Therefore, the radiation is the most sensitive factor.
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Received: 16 April 2014
Published: 20 September 2015
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2015, Vol. 35 
