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[1]AN Bin,XIAO Weiwei.Spatial and Temporal Variations of Potential Evapotranspiration in Shaanxi Province and the Quantification of the Causes from 1955 to 2015[J].Research of Soil and Water Conservation,2018,25(04):146-151.

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Spatial and Temporal Variations of Potential Evapotranspiration in Shaanxi Province and the Quantification of the Causes from 1955 to 2015

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 25 Number of periods: 2018 04 Page number: 146-151 Column: Public date: 2018-06-13

Title:: Spatial and Temporal Variations of Potential Evapotranspiration in Shaanxi Province and the Quantification of the Causes from 1955 to 2015

Author(s):: AN Bin, XIAO Weiwei; 1. School of Tourism & Environment, Ankang University, Ankang, Shaanxi 725000, China;
2. Engineering Technology Research Center for Water Resource Protection and Utilization of Hanjiang River, Ankang, Shaanxi 725000, China

Keywords:: potential evapotranspiration; Penman-Monteith equation; spatial and temporal variations; quantification of the causes; Shaanxi Province

CLC:: P426.2

DOI:: -

Abstract:: In order to have a thorough recognition of the variation characteristics and influencing factors of potential evapotranspiration (ET₀) in Shaanxi Province under the climate change. Based on 20 meteorological sites of daily weather data from 1955 to 2015 in Shaanxi Province, the Penman-Monteith (P-M) is utilized to calculate the potential evapotranspiration (ET₀). The spatial and temporal variations of annual and seasons ET₀ are analyzed by using cumulative distance, Mann-Kendall mutation detection, the optimal partition method, inverse distance weighted interpolation (IDW) and other mathematical methods. The dominant meteorological elements influencing ET₀ are quantitatively studied by using partial correlation and multiple regression models. The results showed that the annual ET₀ of Shaanxi Province from 1955 to 2015 presented slight rising trend with the rate of 1.03 mm/decade. ET₀ changed as the inverted S-shape over the periods. The average ET₀ rates in spring, summer, autumn and winter were 3.72 mm/decade, 0.12 mm/decade, 0.36 mm/decade and -2.95 mm/decade. The spatial distribution of annual and seasonal ET₀ in the study area was significant variation pattern of latitudinal direction zonality. The main impacting factor was average temperature in spring, autumn and winter, but was sunshine duration in summer. The above results indicated that the ET₀ in Shaanxi Province had the characteristics of stage and zonality, influencing factors had the seasonal characteristics. The results would provide valuable information for water resources optimal allocation and assessment in Shaanxi Province.

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