高产农田土壤硝态氮淋失与地下水污染动态研究

对桓台县区域农田监测研究表明,水肥管理不同的2个监测区域郭家区、李家区高产农田土体内NO_3~--N淋失迁移动态有差异,地下水污染亦不同。春天始土体内NO_3~--N含量趋于持续降低,浅层地下水NO_3~--N含量则持续升高,雨季后地下水中NO_3~--N含量尤剧烈升高,并达年内最高值,表现出农田N肥对地下水的直接污染,这可能与李家区灌溉次数多、土壤质地较轻和地下水位较浅有关。

The dynamics of soil nitrate nitrogen leaching and contamination of the groundwater in high-yield farmland

The field scale investigation reveals that in high-yield farmlands where the managements of the irrigation and fertilization are different in Huantai County of Shandong Province.The dynamics of nitrogen leaching and the groundwater pollution quite differ from each other.Soil content of NO3-N keeps decreasing after spring and its concentration of NO3-N in the groundwater correspondingly increases gradually.The concentration in the groundwater dramatically changes and reaches the maximum after the raining season,demonstrating that the direct contamination results from the nitrogen fertilization.This is probahly related to the more irrigation,lighter soil texture and shallower groundwater in this area.