摘要
"引大入秦"灌溉工程在促进秦王川盆地农业发展的同时,农业化肥的使用也导致地下水中NO-3质量浓度明显升高。随着"一带一路"工作的推进,地下水需水量持续增大,水资源短缺问题已成为研究区发展的主要制约因素,但盆地地下水硝酸盐分布特征不明,这使得未来的地下水开发利用存在较大风险。因此,文中在对盆地内地下水进行系统采样分析的基础上,利用数理统计、离子比等方法研究了秦王川盆地地下水硝酸盐污染特征及成因。结果显示,研究区地下水硝酸盐浓度总体偏高,大面积分布硝酸盐氮浓度为10~20mg/L的地下水,在盆地东部山前地带出现条带状硝酸盐氮超标的地下水。受农业灌溉渗水淋洗补给,盆地中部地下水硝酸氮呈现出了由周边丘陵区呈环状向中心降低的规律,盆地中间分布硝酸盐氮浓度小于2mg/L的地下水。农业化肥的使用是研究区地下水硝酸盐氮的主要面状污染来源。生活污水、化粪池及垃圾渗滤液的淋滤下渗是地下水中硝酸盐氮的另一重要污染来源。土地利用类型、氧化还原条件、包气带岩性结构特征、地下水动力条件是秦王川灌区地下水中硝酸盐氮迁移转化及其空间分布的主要影响因素。
With the advance of the"One Belt and One Way"work,the water demand for underground water has been increasing continuously,and the shortage of water resources has become the main constraint factor for the development of the research area.However,the distribution characteristics of nitrate in groundwater in the basin are not clear,which makes the development and utilization of groundwater in the future risky.Therefore,on the basis of systematic sampling and analysis of groundwater in Qin Wangchuan basin,the characteristics and causes of groundwater nitrate pollution in Qin Wangchuan basin were studied by means of mathematical statistics and ion ratio.The results show that the groundwater nitrate concentration in the study area is generally high,and the groundwater with nitrate nitrogen concentration ranging from 10 mg/L to 20 mg/L is widely distributed.There are banded groundwater with nitrate nitrogen exceeding the standard in the piedmont area of the eastern basin.The nitrate nitrogen in groundwater in the central part of the basin decreases annularly from the surrounding hilly areas to the center,and the nitrate nitrogen concentration in groundwater in the middle of the basin is less than 2 mg/L.The use of agricultural fertilizers is the main source of nitrate pollution in groundwater.Leaching and infiltration of domestic sewage,septic tank and landfill leachate are other important sources of nitrate nitrogen pollution in groundwater.The main factors influencing nitrate nitrogen migration and transformation and its spatial distribution are redox conditions,vadose zone lithologic structure,supplementary diameter and drainage conditions.
作者
吕晓立
刘景涛
韩占涛
朱亮
张玉玺
LV Xiaoli;LIU Jingtao;HAN Zhantao;ZHU Liang;ZHANG Yuxi(Institute of Hydrogeology and Environmental Geology,CAGS,Shijiazhuang 050061,China;Hebei and China Geological Survey Key Laboratory of Groundwater Remediation,Shijiazhuang 050061,China)
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2020年第6期139-145,共7页
Journal of Arid Land Resources and Environment
基金
中央级科研院所基本科研业务费项目(SK201901)
中国地质调查局地质调查项目(DD20190331)资助。
