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以石家庄平原区作为研究区域,运用相关分析及回归分析阐明农用地下水开采量与降水量及小麦—玉米种植规模之间的关系。降水量与农用地下水开采量之间的相关系数较小,但作为农作物需水的重要水源,降水量通过影响农业地下水开采强度影响地下水开采总量。农业地下水开采强度在丰水年时明显减小,在枯水年时明显增大。小麦和玉米作为主要的耗水型作物,其种植面积与农用地下水开采量关系密切,随小麦—玉米种植面积的增加(减小),农用地下水开采量表现出明显的增加(减小)趋势。1981年之前,小麦—玉米种植面积每增加1×104 hm2,农用地下水开采量平均增加0.69×108 m3;1981年之后,小麦—玉米种植面积每增加1×104 hm2,农用地下水开采量增加0.23×108 m3。
Taking the plain of Shijiazhuang as the research area, the correlation analysis and regression analysis were used to illustrate the relationship between the amount of agricultural groundwater exploitation and the precipitation and the scale of wheat-corn planting. However, as an important source of water for crops, precipitation affects the total amount of groundwater exploitation by influencing the exploitation intensity of agricultural groundwater. The intensity of exploitation of agricultural groundwater significantly decreased during the wet years and significantly increased during the dry years. As the main water-consuming crops, wheat and corn are closely related to the exploitation of agricultural groundwater. With the increase (decrease) of the wheat-corn planting area, the extraction of agricultural groundwater shows a significant increase (decrease). Before 1981, with the increase of 1 × 104 hm2 of wheat-corn acreage, the extraction of agricultural groundwater increased by 0.69 × 108 m3 on average. After 1981, the increase of wheat-corn acreage increased by 1 × 104 hm2 and 0.23 × 108 m3.