Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2026, Vol. 42 ›› Issue (2): 133-140.doi: 10.11924/j.issn.1000-6850.casb2025-0340

Previous Articles     Next Articles

Changing Characteristics of Potential Soybean Planting Zones in Inner Mongolia under Climate Change

QU Xuebin1(), NIU Dong2, TANG Hongyan3(), LIN Cong1   

  1. 1 Hulunbuir Meteorological Bureau, Hulunbuir, Inner Mongolia 021008
    2 Inner Mongolia Meteorological Service Center, Hohhot 010051
    3 Inner Mongolia Ecology and Agricultural Meteorology Center, Hohhot 010051
  • Received:2025-04-28 Revised:2025-11-26 Online:2026-01-25 Published:2026-01-22

Abstract:

The southeastern foothills of the Greater Khingan Range in Inner Mongolia serve as a critical soybean production base in China, where the shifts in planting zones are vital for ensuring national food security. Based on meteorological data from 38 stations in eastern Inner Mongolia from 1961 to 2020, this study systematically analyzed the impact of climate change on soybean planting zones using climate tendency rate, Gamma distribution, and a small-grid estimation model. Results indicate a significant increase in thermal resources in the region: the average temperature during 1991-2020 rose by 1.11℃ compared to the 1961-1990 period, with ≥10℃ accumulated temperature increasing by 203.2℃·d and the frost-free period extending by 9.4 days. The total areas of potential soybean planting zones were expanded by 27195 km2, with the northern boundary shifting approximately 101-224 km northward. The safe planting zones exhibited a slightly smaller northward shift (101-153 km) but were still expanded by 22,599 km2. Climate warming has significantly enhanced the potential for extending the northern planting boundary of soybeans and promoting mid- and late-maturing varieties. These findings suggest optimizing soybean cultivar arrangements based on accumulated temperature zone shifts, providing scientific support for revitalizing soybean production in Northeast China.

Key words: climate change, soybean, planting zone, accumulated temperature, small-grid estimation, northward and westward expansion, Inner Mongolia