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[1]WANG Jie,WU Hao,HUANG Ying,et al.Spatiotemporal Variations of Reference Crop Evapotranspiration in Central Yunnan[J].Research of Soil and Water Conservation,2015,22(04):41-44.

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Spatiotemporal Variations of Reference Crop Evapotranspiration in Central Yunnan

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 22 Number of periods: 2015 04 Page number: 41-44 Column: Public date: 2015-08-28

Title:: Spatiotemporal Variations of Reference Crop Evapotranspiration in Central Yunnan

Author(s):: WANG Jie, WU Hao, HUANG Ying, WANG Shupeng; Yunnan Hydraulic Research Institute, Kunming 650228, China

Keywords:: reference crop evapotranspiration; central Yunnan; Penman-Monteith equation

CLC:: S161.4

DOI:: -

Abstract:: The ET₀ is the basis of irrigation and irrigation scheme. This paper, based on the meteorological measurement of meteorological stations in central Yunnan, the yearly reference evapotranspiration (ET₀) was estimated. The spatiotemporal characteristics and the influence of meteorological elements were also analyzed. The results showed that the abrupt change of ET₀ happened in 1982 approximately, the downward trend happened from 1982 to 2002, the increased trend happened from 2003 to 2012, the regional average ET₀ was 1 223.7 mm. the main space characteristics of ET₀ is high in central and low in east and west, the maximum value appeared in Yuanmou area in the seasons, the maximum value of ET₀ occurred in spring, and the value of ET₀ in summer was higher than that in autumn, the minimum value of ET₀ occurred in spring. The ET₀ increased with wind velocity, temperature and sunshine duration significantly and decreased with the relative humidity significantly. Partial correlative analysis and multiple regression analysis indicated that wind velocity, relative humidity and sunshine duration were the most significant predictors of the annual ET₀.

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