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Journal of Mountain Science

, Volume 9, Issue 6, pp 817–826 | Cite as

Temporal and spatial variations of ET o and sensitivity coefficients in spring-summer in eastern agricultural areas of Qinghai, China

  • Lu Zhao
  • Chuan LiangEmail author
  • Ningbo Cui
  • Renjuan Wei
  • Haoxiang Yang
Article

Abstract

Reference crop evapotranspiration (ET 0 ) is a key parameter to calculate crop water requirements. In the paper, ET 0 during 1960–2005 was calculated with FAO-56 PM in eastern agricultural areas of Qinghai, China. Then the sensitivity coefficients of ET 0 to meteorological variables were estimated through the nondimensional partial derivative in FAO-56 PM. Results show that the mean annual ET 0 of the whole area is 904 mm, and ET 0 portrays a very significant decrease during the 46 years. In spatial, ET 0 decreases from southeast to northwest, firstly increases then decreases from southwest to northeast. Through sensitivity analysis, in spring the most sensitive variable is relative humidity, while in summer is temperature. The temperature, sunshine duration and wind speed sensitivity coefficients (S(TA), S(n), S(u)) are higher in middle areas as opposed to surrounding areas, while the relative humidity sensitivity coefficient (S(RH)) has an opposite distribution rule.

Keywords

ET0 FAO-56 PM Sensitivity coefficients Eastern agricultural areas of Qinghai 

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Copyright information

© Science Press, Institute of Mountain Hazards and Environment, CAS and Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Lu Zhao
    • 1
    • 2
  • Chuan Liang
    • 1
    Email author
  • Ningbo Cui
    • 1
  • Renjuan Wei
    • 1
  • Haoxiang Yang
    • 1
  1. 1.State Key Laboratory of Hydraulics and Mountain River EngineeringSichuan UniversityChengduChina
  2. 2.Civil Engineering DepartmentSichuan College of Architectural TechnologyDeyangChina

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