基于农用地分等成果的陕西省三原县耕地粮食生产潜力核算

The Accounting of Farmland Grain Potential Productivity in Sanyuan County of Shaanxi Province

为了明确陕西省粮食大县三原县的耕地粮食生产潜力,在农用地分等成果的基础上,对三原县耕地生产潜力和土地利用强度进行了研究。结果表明,南部泾渭冲积平原区的耕地自然生产潜力、利用生产潜力、可实现生产潜力以及实际单产都大于北部黄土台塬区和西北低山残塬沟壑区;理论利用强度总体相差不大,南部平原区的乡镇总体较高,西北部沟壑区最小。可实现利用强度与理论利用强度区域差异相反,西北部总体较高,南部总体较小。实际利用强度差别较小,而且没有明显的分异规律,其中7个乡(镇)的实际利用强度在0.5左右,说明这些乡镇的实际利用强度还有50%待提高的空间。理论增产潜力、利用增产潜力均以南部泾渭冲积平原区的9个乡(镇)较大,西北沟壑区的嵯峨乡较小。实际增产潜力在各乡镇没有明显的差异,同时较为均衡、适中。未来三原县的粮食增产潜力主要在南部泾渭冲积平原区。

This study was conduced to investigate the farmland grain potential productivity and land use intensity,and the corresponding methods for both two in Sanyuan County,based on the results of agriculture classification.The results showed that natural potential productivity,utilization potential productivity,achievable potential productivity and real per unit area yield in Jingwei southern alluvial plain area were higher than those in Northern Loess Plateau and Northwest gully area.The theoretical use intensity presented no statistical difference all over the Sanyuan,with the highest in Southern Plains and the lowest in Northwest Plateau.In contrary,the achievable use intensity had small differences,of which the Northwest Plateau showed totally higher and Southern Plains totally lower.The real use intensity in the most towns was similar and no obvious variation,among which seven towns were around 0.5,illustrating the real use intensity in these townships had 50％ space for improvement.The theoretical and the utilization increases in potential productivity were higher in Southern Plains,and lower in Northwest Plateau.The real increase in potential productivity was balanced and moderate.The future potential increase could be in the Jingwei southern alluvial plain area in Sanyuan County.