Huimin ZHONG, University of Chinese Academy of Sciences, China
Zhengjia LIU, University of Chinese Academy of Sciences, China
Detailed information on spatial distributions of croplands and grain yields is crucial for agricultural management and food security, but is often limited by a lack of geospatial data. By integrating satellite and statistical data, we produced new geospatial data of cropland areas and grain yields of China. This study found that expansion of constructed land driven by urbanization reduced the area of high-yielding croplands in the most developed parts of China. Yet, cropland expansion occurred in temperature/water-limited regions of Northern Arid and Semiarid Region (NASR) and Northeast China Plain (NCP). This spatial transfer of croplands resulted in low-yield croplands increasing from 38.96% (2000) to 41.52% (2019), and high-yield croplands decreasing from 38.41% (2000) to 33.44% (2019), implying spatial challenges of grain production. Generally, every 1 km2 of cropland loss in traditional high-yield zones required nearly 1-3 times expansion in area in NASR and NCP to balance grain yield losses.
Mots clés : Cropland pattern|Grain yield|Change analyses|Change analyses
A104657hz