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中国农学通报 ›› 2021, Vol. 37 ›› Issue (11): 79-86.doi: 10.11924/j.issn.1000-6850.casb2020-0124

所属专题: 园艺 农业气象

• 资源·环境·生态·土壤·气象 • 上一篇    下一篇

基于FAO Penman-Monteith方法的西藏春青稞干旱趋势研究

高佳佳1,2,3(), 徐薇4, 边央4, 平措桑旦1,2,3, 巴桑1,2,3, 杜军1,2,3()   

  1. 1西藏高原大气环境科学研究所,拉萨850000
    2中国气象局成都高原气象研究所拉萨分部,拉萨850000
    3西藏自治区重点实验室,拉萨850000
    4日喀则市气象局,西藏日喀则857000
  • 收稿日期:2020-04-13 修回日期:2020-08-25 出版日期:2021-04-15 发布日期:2021-04-13
  • 通讯作者: 杜军
  • 作者简介:高佳佳,女,1986年出生,硕士研究生,研究方向为气候变化与预测。通信地址:850001 西藏拉萨市城关区林廓北路2号,E-mail: gaojj12@lzu.edu.cn
  • 基金资助:
    西藏自治区气象局中央财政资金“三农”服务专项“灾害性天气风险监测评估模型”(2019)

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

摘要:

本文基于联合国农粮署(FAO)提供的Penman-Monteith方法,评估了1981—2010年西藏春青稞生育期内的自然水分供需比(PET),以探索利用PET开展针对作物的干旱监测、预报业务的可行性。结果显示,不同降水带之间的PET差异比不同温度带之间的差异更大。在各个降水带内,春青稞在生育中前期受旱几率均相对较高,其中干旱和半干旱区的旱情和出现旱灾的概率均更高。从PET的年际变化来看,西藏全区的PET数值在降水、温度、风速、相对湿度的共同影响下经历了缓慢下降、快速上升、快速下降的变化过程,其中PET与日均降水的相关性最高。综上,PET可以在不同时间尺度上综合考虑气象、光照和作物本身属性对春青稞的受旱程度进行比较准确的定量化评估,适合用于针对作物的旱情评估业务。

关键词: 干旱趋势, FAO Penman-Monteith, 青稞, 生育期, 自然水分供需比(PET), 潜在蒸散发

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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