主办单位:中国气象局沈阳大气环境研究所
国际刊号:ISSN 1673-503X
国内刊号:CN 21-1531/P

Journal of Meteorology and Environment ›› 2023, Vol. 39 ›› Issue (4): 130-137.doi: 10.3969/j.issn.1673-503X.2023.04.016

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Temporal and spatial characteristics of drought during soybean growing season in Liaoning province based on SPI and SPEI

Shan JIANG1,2(),Shujie ZHANG2,*(),Jing ZHANG1,Qiuting DONG3,Xiaowei SONG1,Xuan ZHAO1,Lu YU1,Lili YANG1   

  1. 1. Shenyang Meteorological Service, Shenyang 110168, China
    2. Institute of Atmospheric Environment, China Meteorological Administration/Key Laboratory of Agrometeorological Disasters, Shenyang 110166, China
    3. Meteorological Service in Hunnan District of Shenyang, Shenyang 110186, China
  • Received:2023-03-09 Online:2023-08-28 Published:2023-09-23
  • Contact: Shujie ZHANG E-mail:jiangshan-33@163.com;zhangshujie_a@163.com

Abstract:

Using daily precipitation and daily average temperature from 52 meteorological stations in Liaoning province from 1961 to 2020, the standard precipitation index (SPI) and the standard precipitation evaporation index (SPEI) were calculated at soybean growing season scale and at each developmental stage scale.Mann-Kendall test was used to examine the spatial and temporal variation characteristics of drought and drought frequency of soybean at different time scales.The study showed that both SPI and SPEI indices showed aridity trends during soybean growing season, with SPEI monitoring a slightly more severe drought than SPI.At all soybean developmental stages, SPEI and SPI indices showed wetting trends at the sowing-emergence stage, and aridity trends at the emergence-flowering, flowering-podding, and podding-maturity stages, with significant aridity trends at the flowering-podding stage.Spatially, the SPEI index monitored a larger range of drought and drought prone areas than those monitored by the SPI, and the degree of drought was stronger, with the most severe drought happening in the west of Liaoning.Therefore, the SPEI index is more applicable compared to the SPI index when evaluating drought of the soybean at growing season and each developmental stage.

Key words: Daily precipitation, Daily average temperature, Drought assessment

CLC Number: