| Estimate and analysis of silage maize evapotranspiration in Horqin Sandy Land |
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| DOI：10.7606/j.issn.1000-7601.2018.02.10 |
| Key Words: ET0 calculation model SIMdual_Kc model crop coefficient soil evaporation crop transpiration aerodynamic term |
| Author Name | Affiliation | | MA Peng-fei | Inner Mongolia Agricultural University Water Conservancy and Civil Engineering College, Inner Mongolia Water Resource Protection and Utilization Key Laboratory, Hohhot , Inner Mongolia 010018, China | | LIU Ting-xi | Inner Mongolia Agricultural University Water Conservancy and Civil Engineering College, Inner Mongolia Water Resource Protection and Utilization Key Laboratory, Hohhot , Inner Mongolia 010018, China | | DUAN Li-min | Inner Mongolia Agricultural University Water Conservancy and Civil Engineering College, Inner Mongolia Water Resource Protection and Utilization Key Laboratory, Hohhot , Inner Mongolia 010018, China | | WANG Dan | Inner Mongolia Agricultural University Water Conservancy and Civil Engineering College, Inner Mongolia Water Resource Protection and Utilization Key Laboratory, Hohhot , Inner Mongolia 010018, China | | QI Xiu-jiao | Inner Mongolia Agricultural University Water Conservancy and Civil Engineering College, Inner Mongolia Water Resource Protection and Utilization Key Laboratory, Hohhot , Inner Mongolia 010018, China |
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| Abstract: |
| This study aimed to accurately estimate the evapotranspiration of silage maize in Horqin sandy land. In this paper, ASCE Penman-Monteith (ASCE-PM) models was used to estimate the reference evapotranspiration (ET0), and we compared the simulated soil moisture content by SIMdual_Kc model and the corresponding measured values. The root-mean-square-error (RMSE), consistency index (d), average absolute error (AAE), Nash-Sutcliffe efficiency index(E) were chosen as three evaluation indicators combining the regression coefficient (b) and the decisive coefficient (R2) to rate and verify SIMdual_Kc model, and then simulated silage maize crop factor crop, simulating evapotranspirationof silage maize, soil evaporation and crop transpiration combined with ASCE-PM model and analyzed their influencing factors.The results illustrated that SIMdual_Kc model accurately simulated the soil water content and the soil evaporation change, and the basic crop coefficients were 0.25, 0.9 and 0.5 respectively at each stage. During the growing season, the soil evaporation decreased from the peak value to the lower level before sowing, and recovered before harvest; the transpiration rate was bimodal at most of the time except for emergence and harvest, and the law of daily variation was generally high and low at noon.Transpiration rate from the date of emergence to the second half of the growing medium term was in a high level, then gradually weakened.The linear relationship between the actual evapotranspiration of silage maize and the solar radiation was significant (R=0.643), the correlation with the actual evapotranspiration of silage maize was from high to low, followed by temperature, air humidity and wind speed. The contribution rate of aerodynamics 5 d scale of ASCE-PM model was 27.94%～77.66%, and the contribution rate of model aerodynamic items increased and decreased with wind speed.In conclusion, the ASCE-PM model combined with the double-crop coefficient could estimate the actual evapotranspiration of silage maize and the soil evaporation and silage maize transpiration in Horqin sandy. |
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