Chinese Journal of Agrometeorology ›› 2023, Vol. 44 ›› Issue (09): 834-844.doi: 10.3969/j.issn.1000-6362.2023.09.007

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Analysis on Change Characteristics of Drought Intensity during the Growth Period of Highland Barley in Tibet

SHI Ji-qing, DOU Yong-li, ZHANG Xin-ping, XI Feng, LUO Zhen, GAN Chen-long   

  1. 1. Tibet Climate Center, Lhasa 850000, China; 2. Shigatse National Climate Oberservatory, Shigatse 857000; 3. Information and Internet Center of Tibet Meteorological Bureau, Lhasa 850000; 4. Tibet Meteorological Disaster Prevention Technology Center, Lhasa 850000; 5. Meteorological Observatory of Tibet Autonomous Region, Lhasa 850000; 6. Maizhokunggar County Meteological Bureau, Lhasa 850200
  • Received:2022-10-25 Online:2023-09-20 Published:2023-09-12

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Abstract: Based on the daily meteorological data of 25 meteorological stations in the main highland barley planting areas in Tibet from 1981 to 2020, the daily meteorological drought comprehensive index (MCI) was calculated. The Mann-Kendall mutation test, Morlet wavelet analysis and R/S analysis were used to analyze the temporal and spatial distribution and trend change of drought intensity in each growth period of the region in the past 40 years, in order to provide a scientific basis for agricultural production safety and local disaster prevention and mitigation in Tibet. The results showed that: (1)the drought characteristics of Tibetan highland barley at different growth stages were different, and the drought intensity at the sow-tillering stage was not significantly increased, while the drought intensity at the whole growth stage was significantly decreased compared with that at the tiller-heading stage and the heading-maturity stage.（2）The drought intensity at the sow-tillering stage reached the lowest level in the 2000s, and the tiller-heading stage, head-maturity stage and the whole growth reached the highest level in the 1980s. The drought intensity of tiller-heading stage, head-maturity stage and the whole growth stage showed significant weakening mutations in 1989, 2001 and 1989, respectively. (3)The drought intensity at the sow-tillering stage was weakened as a whole, and the regional difference between tiller-heading stage was small, while the spatial difference between head-maturity stage was large. The drought intensity in the whole growth period showed a distribution feature of increasing from the central and southern marginal areas of the study area to the east and west. (4) The future drought intensity in the sow-tillering stage, the head-maturity stage and the whole growth stage has a trend of continuous drought on the scale of 15 years, 33 years and 33 years respectively, and the tiller-heading stage has a trend of continuous wet on the scale of 13 years.

Key words: Tibet, Drought intensity, Trend analysis, MCI index, Barley