Arid Zone Research ›› 2021, Vol. 38 ›› Issue (3): 785-793.doi: 10.13866/j.azr.2021.03.20

• Applied Climate • Previous Articles     Next Articles

Analysis of drought-driving climatic factors of Xilin Gol grassland in the past 59 years

ZHAO Shuixia1(),WANG Wenjun1,WU Yingjie1(),QUAN Qiang1,WANG Sinan2,CHEN Xiaojun1,LIU Tiejun1   

  1. 1. Institute of Water Resources for Pastoral Area, China Institute of Water Resources and Hydropower Research, Hohhot 010020, Inner Mongolia, China
    2. Water Conservancy and Civil Engineering College, Inner Mongolia Agricultural University, Hohhot 010018, Inner Mongolia, China
  • Received:2020-11-18 Revised:2020-12-28 Online:2021-05-15 Published:2021-06-17
  • Contact: Yingjie WU E-mail:zhaoshuixia2010@163.com;508188330@qq.com

Abstract:

The Xilin Gol grassland is a typical arid and semi-arid pastoral area in northern China. The measured daily temperature and precipitation data of nine meteorological stations in Xilin Gol Leagues from 1959 to 2017 were used in this study. By calculating the potential evapotranspiration and water deficit and using trend analysis and the R/S range analysis method, the spatiotemporal variation and its impact on climatic factors in the arid and semi-arid areas were studied. This study provides scientific support for drought monitoring and prediction in northern pastoral areas. Results showed that in the past 59 years, air temperature in Xilin Gol Leagues has increased significantly [0.39 °C·(10a)-1], while precipitation decreased [-5.4 mm·(10a)-1], and the climate gradually became warm and dry. The precipitation in the southeast of Xilin Gol Leagues is significantly higher than in the northwest. The water deficiency decreased gradually from west to east, and temperature and evapotranspiration in the southwest were higher than in the northeast. The inter-annual variation of key climatic factors (rainfall, temperature, ET0, and water surplus and deficit) in different geographical locations is significantly different. The variation within a year showed a single peak periodic change. This indicated that the best water and heat conditions are in July. The warm and dry tendency will continue positively in the future, and the risk of desertification in the western Erenhot will be more serious. The precipitation and water deficiency in eastern West Ujimqin Banner and Naren Baolige region, Abaga Banner in the middle and north region will decrease significantly in the future, having adverse effects on vegetation growth and the ecological environment.

Key words: arid and semi-arid pastoral area, Xilin Gol grassland, climatic factors, spatio-temporal variation, evolution trend