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[1]CAO Yongqiang,XIAO Chunliu,Li Yuanfei,et al.Characteristics and Causes of Potential Evapotranspiration in Spring in Hebei Province[J].Research of Soil and Water Conservation,2019,26(05):195-201,209.

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Characteristics and Causes of Potential Evapotranspiration in Spring in Hebei Province

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 26 Number of periods: 2019 05 Page number: 195-201,209 Column: Public date: 2019-09-06

Title:: Characteristics and Causes of Potential Evapotranspiration in Spring in Hebei Province

Author(s):: CAO Yongqiang, XIAO Chunliu, Li Yuanfei, Liu Mingyang; College of City and Environment, Liaoning Normal University, Dalian, Liaoning 116029, China

Keywords:: potential evapotranspiration; spatiotemporal characteristics; sensitivity analysis; spring; Hebei Province

CLC:: P426.2

DOI:: -

Abstract:: Potential evapotranspiration (ET₀) is an important part of regional energy balance and water balance. It is very important to optimize and adjust agricultural production structure and rational allocation of water resources by discussing its historical evolution rules and causes. Based on the daily meteorological data of 24 typical meteorological stations in Hebei Province from 1968 to 2018, the spatial and temporal distribution of ET₀ in Hebei Province and its influencing factors were analyzed by using Penman-Monteith model, sensitivity analysis, M-K test method and spatial interpolation method. The results are as follows. (1) From the point of time distribution, the annual mean value of ET₀ in spring in Hebei Province is 353.20 mm in 51 years, with a decreasing trend of -1.679 mm/decade, and its periodic variation has 35-year main cycle and 20-year cycle; The changes of ET₀ in spring are positively sensitive to mean air temperature, maximum temperature, minimum temperature, sunshine duration and mean wind speed from the northwest to the southeast. (2) In terms of influencing factors, the variation of ET₀ in spring is positively sensitive to the mean temperature, the maximum temperature, the lowest temperature, the sunshine duration and the average wind speed. The sensitivity to the relative humidity is negative, and the sensitivity to various meteorological factors follows the order:relative humidity > maximum temperature > unshine hours > mean wind speed > mean temperature > minimum temperature. (3) From the spatial distribution of the causes, the dominant climatic factors of ET₀ change in northern Hebei Province are mean temperature, relative humidity in central and western regions, and mean wind speed in southern and eastern regions. The research results can provide scientific guidance for the comprehensive evaluation of water resources and the actual agricultural production.

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