Sensitivity of Reference Crop Evapotranspiration in Shaanxi Province

Abstract:

Reference crop evapotranspiration (ET₀) is a key to estimate crop water requirements, and also an important component of irrigation schedule and water resources planning, sensitivity analysis are crucial in assessing the impact of climate changes in ET₀ estimations. In this study, based on the daily meteorological data of 18 meteorological stations in Shanxi Province from 1961 to 2000, the daily ET₀ values were calculated using Penman-Monteith equation recommended by FAO-56. The trends of climate variables were detected by using Mann-Kendall test. Sensitivity coefficients were employed to predict responses of ET₀ to five climatic variables, combined with annual of meteorological factors quantitative analysis of ET₀ changes. The results show that statistically significant decreasing trends are observed in wind and daily sunshine hours in Guanzhong and southern Shaanxi. Relative humidity has a significant decreasing trend in northern Shaanxi. In general, ET₀ value is on the decline; relative humidity is the most sensitive variable, followed by solar radiation, daily sunshine hour, wind speed and mean temperature. The change of ET₀ is primarily attributed to the significantly decreasing in wind speed and sunshine hour.

• Periodical: Applied Mechanics and Materials (Volume 700)
• Pages: 374-385
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.700.374
• Online since: December 2014
• Authors: Yue Song*, Xiao Ling Su
• Keywords: Contribution, Reference Crop Evapotranspiration (ET₀), Sensitivity, Trend

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