摘要：Precipitation variation affects the groundwater system in well-irrigated areas. First, it directly affectsgroundwater recharge and buried depth. Second, it affects crop irrigation, and consequently, also affectsburied depth. The direct and indirect effects of precipitation on groundwater buried depth must be elucidatedto achieve stable production and promote the rational use and protection of groundwater resources. In thisstudy, Shijiazhuang Plain is selected as the subject. Variations in groundwater buried depth and exploitationare first analysed. Then, the relationship between groundwater buried depth and precipitation, as well as thatbetween precipitation and groundwater irrigation intensity per area, are investigated. Finally, the effect ofprecipitation on groundwater buried depth is revealed. Results show that the annual mean groundwaterburied depth does not change with increasing or decreasing precipitation. As an important source ofgroundwater recharge, precipitation directly affects groundwater buried depth during a year and affectsgroundwater buried depth differently during wet, normal, and dry years. Precipitation is an important supplierof crop water requirements. Thus, increased precipitation reduces irrigation intensity requirement per cultivationarea. By contrast, irrigation intensity increases with decreasing precipitation. That is, precipitation can affectgroundwater buried depth by affecting irrigation intensity per cultivation area, and this effect can be obviouslyobserved from the varying characteristics of irrigation intensity both in different decades as well as in wet,normal, and dry years.
