Simulation of reference crop evapotranspiration and analysis of the factor effect in Horqin wet meadow

doi:10.7522/j.issn.1000-694X.2019.00077

Journal of Desert Research ›› 2020, Vol. 40 ›› Issue (2): 134-143.DOI: 10.7522/j.issn.1000-694X.2019.00077

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Simulation of reference crop evapotranspiration and analysis of the factor effect in Horqin wet meadow

Li Xia¹, Liu Tingxi^1,2, Duan Limin^1,2, Wang Guanli^1,2, Tong Xin^1,2, Zhou Yajun¹, Yang Xiaojun¹

1. Water Conservancy and Civil Engineering College, Inner Mongolia Agricultural University, Hohhot 010018, China;
2. Inner Mongolia Key Laboratory of Water Resource Protection and Utilization, Inner Mongolia Agricultural University, Hohhot 010018, China

Received:2019-07-04 Revised:2019-09-03 Online:2020-03-20 Published:2020-04-26

Abstract

Abstract: The FAO 56 P-M model was used to simulate reference crop evapotranspiration (ET₀) and explore the influencing factors of ET₀ for the Horqin wet meadow in the arid and semi-arid areas under climate change. The applicability of the model was evaluated by the eddy covariance system, and the influencing factors of ET₀ were identified by path analysis and index sensitivity analysis. Results showed that: (1) The accuracy of hour-scale simulation was the highest, followed by day-scale simulation, and the monthly scale simulation was poor.The simulation effect was also different under sunny, cloudy and rainy weather conditions on the hourly scale,sunny days were best, rainy days were worse. (2) The change of ET₀ in the year presented a single-peak curve, and the growth season was significantly higher than that in the non-growth season, mainly from March to October, accounting for 89.79% of the annual ET₀. The hourly distribution of ET₀ in typical sunny days during the growing season follows the single peak pattern of inverted "U". (3) The path coefficient of ET₀ and the total contribution to the estimation reliability of regression equation E were shown as VPD > T_min > R_n > u₂, VPD is the most important factor affecting ET₀. In the sensitivity analysis of indicators, the largest change of E is caused by the removal of VPD, indicating that ET₀ is the most sensitive to the change of VPD, followed by u₂, T_min and R_n.

Key words: Penman-Monteith model, reference crop evapotranspiration, time scale, meteorological factors, path analysis

CLC Number:

S161.4

Li Xia, Liu Tingxi, Duan Limin, Wang Guanli, Tong Xin, Zhou Yajun, Yang Xiaojun. Simulation of reference crop evapotranspiration and analysis of the factor effect in Horqin wet meadow[J]. Journal of Desert Research, 2020, 40(2): 134-143.

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Simulation of reference crop evapotranspiration and analysis of the factor effect in Horqin wet meadow

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