关键词:
农作物种植结构,
时空演变,
空间自相关,
汾渭平原
Abstract:
Food security is fundamental to national development and social stability. The analysis of the spatiotemporal evolution of crop planting structures provides a theoretical basis for ensuring regional food security and promoting the sustainable development of agriculture. This study examines the crop planting structure across 117 counties (cities/districts) in the Fenwei Plain, Shanxi Province and Shaanxi Province, China based on agricultural statistical data for the period of 2000—2022. Employing methods such as the standard deviation ellipse model and spatial autocorrelation analysis, the spatial and temporal dynamics of major crop planting structures over this period are explored. The results indicate the following. (1) Over the study period, 88 distinct crop planting structure types were identified, with wheat, corn, and their combinations (wheat type, corn type, wheat-corn type, and corn-wheat type) being the dominant types. Moreover, spatially and temporally, the number of wheat-type counties gradually declined, while the number of corn-type counties steadily increased. Wheat-corn-type counties expanded from the southwest to the northeast of the Fenwei Plain, while corn and wheat varieties were dispersed throughout the region. Crop planting structure diversity peaked in 2005, whereas the richness index was lowest in 2015. (2) For the period of 2000—2022, the planting patterns of wheat, corn, and vegetables exhibited a distribution trend along the northeast-southwest axis. The center of gravity for wheat remained stable, whereas that of corn shifted progressively northeastward. Meanwhile, the center of gravity for vegetables moved from Heyang County to Chengcheng County in a southwestward direction. Thus, the spatial distribution of major crops in the Fenwei Plain demonstrates a differentiated development trend, with a decline in wheat cultivation and expansion in corn and vegetable cultivation. To ensure food security, future adjustments to the crop planting structure of the Fenwei Plain should be made based on an analysis of these spatiotemporal trends and supported by macroeconomic regulatory measures.
Key words:
crop planting structure,
temporal and spatial evolution,
spatial autocorrelation,
Fenwei Plain