Spatiotemporal Variation and Sensitivity of Reference Crop Evapotranspiration during Growth Season in Northern Xinjiang

doi:10.3969/j.issn.1000-6362.2015.06.004

Abstract

Abstract: Based on daily meteorological data from 20 meteorological stations from 1966 to 2012, ET0 was calculated during crops growing season by using the Penman-Monteith equation. The spatiotemporal variation of ET0 and its sensitivity to key climatic factors were analyzed by using of the Mann-Kendall test, the factors' dedication rate, and sensitive coefficients. The results showed that the average ET0 in Northern Xinjiang was 939.43mm, and the ET0 decreased at the rate of 16.30mm·10y-1 in last 47 years, with an abrupt change in 1981 according to the Mann-Kendall trend test. Low ET0 values occurred in mountain regions, while high values were found in the Junggar basin and piedmont plain. Average wind speed played the most important role with regards to changes in ET0, followed by temperature, vapor pressure, and sunshine hours. ET0 was sensitive to vapor pressure negatively, and sensitive to temperature, average wind speed, and sunshine hours positively in Northern Xinjiang. The values of sensitive coefficients to climatic factors were temperature, vapor pressure, wind speed, and sunshine hours. The promoting effect of elevated vapor pressure, less wind speed, and less sunshine hours on ET0 was stronger than the reducing effect of increased temperature, which was the key reason that ET0 decreased generally during crops growth season in Northern Xinjiang.

Key words: Reference crop evapotranspiration, Penman-Monteith equation, Contribution rate, Sensitivity, Northern Xinjiang

LI Si-si, ZHANG Fei-yun, BAI Lei, LI Lan-hai. Spatiotemporal Variation and Sensitivity of Reference Crop Evapotranspiration during Growth Season in Northern Xinjiang[J]. Chinese Journal of Agrometeorology, 2015, 36(06): 683-691.

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