Arid Zone Research ›› 2022, Vol. 39 ›› Issue (5): 1410-1427.doi: 10.13866/j.azr.2022.05.07

• Applied Climate • Previous Articles     Next Articles

Drought characteristics and regression models of drought characteristics and response factors of various climatic areas in Inner Mongolia during main crop growing season

GAO Xiaoyu1(),TANG Pengcheng2,ZHANG Sha1,QU Zhongyi1(),YANG Wei1   

  1. 1. Water Conservancy and Civil Engineering College, Inner Mongolia Agricultural University, Hohhot 010018, Inner Mongolia, China
    2. Institute of Water Resources for Pastoral Area, China Institute of Water Resources and Hydropower Research, Hohhot 010020, Inner Mongolia, China
  • Received:2022-04-11 Revised:2022-06-27 Online:2022-09-15 Published:2022-10-25
  • Contact: Zhongyi QU E-mail:gaoxiaoyu000@163.com;quzhongyi@imau.edu.cn

Abstract:

With the foundation of global climate change in recent years, droughts in various climatic areas in Inner Mongolia may bring unpredictable disaster risks to local agricultural production. The whole region was divided into five climatic areas, and monthly data was received from 46 meteorological stations from 1981 to 2012. Twenty meteorological stations from 2014 to 2020 were selected to calculate the different time scales of the standardized precipitation evapotranspiration index (SPEI) using precipitation and reference evapotranspiration from the Penman-Monteith method to reveal the drought characteristics and its dominant meteorological factors during the crop growing season (May-September) in Inner Mongolia. A monthly drought during the crop growing season was revealed. The high-incidence month and region of drought in the growing season in various climatic areas were identified by the SPEI of a 1-month scale, and a stepwise linear regression method was selected and verified to extract the dominant meteorological factors driving the drought in each month and the whole growing season in various climatic areas. Results indicated that the following: (1) from the interannual changes, the drought from 1998 to 2008 was more serious, and the drought in other years was less serious. (2) The largest drought area and degree appeared in May during the crop growing season. The probability of moderate drought in the moist and semi-humid area was 37% higher compared to the hyper-arid area, while the extreme drought probably occurred in the moist and semi-humid area and dry and semi-humid area. (3) Dominant meteorological factors driving the drought varied in the crop growth period of various climatic areas in Inner Mongolia. Precipitation and a minimum temperature were the main impact factors for a drought in the crop growing season. (4) Using limited meteorological data, the regression models in each climate region performance well can be used to estimate the monthly SPEI. The results provide a theoretical basis for scientific evaluation of drought characteristics in the spring maize growing season and formulates reasonable measures of response to the drought.

Key words: climate areas, drought characteristics, standardized precipitation evapotranspiration index, meteorological factors, regression models, growing season of crops, Inner Mongolia