Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2021, Vol. 37 ›› Issue (11): 79-86.doi: 10.11924/j.issn.1000-6850.casb2020-0124

Special Issue: 园艺 农业气象

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The Drought Tendency of Spring Highland Barley on Tibet Plateau: A Research via the FAO Penman-Monteith Method

Gao Jiajia1,2,3(), Xu Wei4, Bian Yang4, Ping Cuosangsan1,2,3, Ba Sang1,2,3, Du Jun1,2,3()   

  1. 1Tibet Plateau Atmospheric Environmental Science Research Institute, Lhasa 850000
    2Lhasa Branch of Chengdu Institute of Plateau Meteorology, China Meteorological Administration, Lhasa 850000
    3Key Laboratory of Atmospheric Environment of Tibet Plateau, Lhasa 850000
    4Shigatse Meteorological Bureau of Tibet, Tibet Shigatse 857000
  • Received:2020-04-13 Revised:2020-08-25 Online:2021-04-15 Published:2021-04-13
  • Contact: Du Jun E-mail:gaojj12@lzu.edu.cn;dujun0891@163.com

Abstract:

The Penman-Monteith method provided by the Food and Agriculture Organization of the United Nations (FAO) was used to evaluate the natural moisture supply-demand ratio (PET) of spring highland barley on Tibet plateau during 1981-2010 in order to explore the feasibility to use PET as the indicator for crop drought monitoring and prediction. The results show that compared with the differences between temperature zones, the differences between precipitation zones are much larger. In each precipitation zone, probability of drought is much higher in the early stage of the highland barley growth, and both the probability and severity of drought in arid and sub-arid regions are much higher. During the 30 years, the annual mean PET of the whole Tibet plateau has been through 3 stages of slowly decrease, rapid increase and rapid decrease under the comprehensive influences of precipitation, temperature, wind speed and relative humidity. The correlation between PET and precipitation is the most robust compared with other meteorological elements. In general, PET can quantitatively indicate the drought severity of spring highland barley by comprehensively considering the influences of meteorological, radiative and vegetative factors accurately, making it suitable for drought monitoring.

Key words: drought trend, FAO Penman-Monteith, highland barley, period of duration, the natural moisture supply-demand ratio (PET), potential evapotranspiration

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