Acta Geographica Sinica ›› 2022, Vol. 77 ›› Issue (9): 2308-2321.doi: 10.11821/dlxb202209012

• Clamate Change and Agricultural Geography • Previous Articles     Next Articles

Spatiotemporal pattern of soil moisture and its meteorological driving factors in dry croplands across China from 1992 to 2018

ZHUANG Huimin1(), ZHANG Zhao1(), CHENG Fei1, ZHANG Liangliang1, HE Bangke2   

  1. 1. Academy of Disaster Reduction and Emergency Management, Ministry of Emergency Management and Ministry of Education, School of National Safety and Emergency Management, Beijing Normal University, Beijing 100875, China
    2. State Key Laboratory of Remote Sensing Science, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China
  • Received:2021-11-29 Revised:2022-06-14 Online:2022-09-25 Published:2022-11-03
  • Contact: ZHANG Zhao E-mail:zhuanghuimin@mail.bnu.edu.cn;zhangzhao@bnu.edu.cn
  • Supported by:
    National Key R&D Program of China(2020YFA0608201)

Abstract:

Soil moisture is an important variable that affects water-heat exchange between land and air, indicating the evolutionary characteristics of drought. In order to reveal the characteristics of soil moisture in dry cropland across China and its meteorological driving factors, this paper uses site data to study the spatial and temporal characteristics of soil moisture change trends in dry cropland across the country from 1992 to 2018, and uses correlation and sensitivity analysis methods to explore the driving mechanism of soil moisture. The results showed that the soil moisture in dry cropland across China tended to change from decreasing to increasing in 2001, which was dominated by soil moisture in summer and autumn. In addition, there is spatial heterogeneity in the change of soil moisture. Since 2001, the soil moisture in the northeast region has increased significantly, while that of the southwest region has decreased significantly. The spatiotemporal variation of precipitation and evapotranspiration is the main reason for the spatiotemporal variation of soil moisture, and the two factors have a synergistic effect. The northern region is dominated by precipitation, while the southern region is dominated by evapotranspiration.

Key words: soil moisture, dry croplands, temporal trend, spatial pattern, meteorological factors