辽河流域典型农区地下水硝酸盐时空变化特征  

Spatial-temporal Change Characteristics of Nitrate in Groundwater in Typical Agricultural Areas of Liao River Basin

作　　者：牛世伟[1] 安景文[1] 宫亮[1] 蔡广兴[1] 何志刚[1] 陈癑 刘子琪[1] 隋世江[1] 

机构地区：[1]辽宁省农业科学院植物营养与环境资源研究所,沈阳110161

出　　处：《湖北农业科学》2016年第5期1147-1150,1155,共5页Hubei Agricultural Sciences

基　　金：农业部农业生态环境保护项目(2110402-201258)

摘　　要：为了解和评价农业种植区域地下水硝酸盐含量状况,2005～2012年采集辽河流域典型农区2 839个井次的地下水样品,分析硝酸盐含量。结果表明,辽河流域典型农区地下水硝态氮平均为22.75 mg/L,井深小于或等于30 m地下水硝酸盐含量达到国家地下水质量标准的年份较少,井深30～100 m的除2011年外均达到标准,井深大于100 m的均能达到Ⅱ类水标准,各监测时期的硝酸盐含量和超标率有较大相关性;不同井深地下水硝酸盐含量差异明显,井深小于或等于30 m硝酸盐含量大于井深30～100 m的大于井深大于100 m的,随着井深深度的增加,地下水硝酸盐含量逐渐降低;以时间动态来看,硝酸盐含量总体呈逐年升高的趋势,超标可能性会进一步加大。By sampling groundwater samples from 2 839 wells in typical agricultural areas of Liao river basin from 2005 to2012, the nitrate concentration was analyzed to understand and evaluate nitrate status in groundwater of agricultural cultivation areas. The results showed that the average nitric nitrogen concentration of groundwater in typical agricultural areas of Liao river basin was 22.75 mg / L. The groundwater nitrate concentration from wells less than 30 meters depth reached the quality criterion of national groundwater in few years, from the wells in 30～100 meters depth, which met the quality criterion except for 2011, and from wells more than 100 meters depth, all attained Class II water standard, there was a significant correlation between nitrate concentration and over standard rate in different monitoring periods. Nitrate concentration of groundwater was significantly affected by different well depth, in the order of less than 30 m 30 ～100 m more than 100 m. With the increase of well depth, nitrate concentration of groundwater decreased gradually. From temporal dynamics, nitrate concentration increased year by year, resulting in the further increase of over standard possibility.

关 键 词：农业种植区域 地下水 硝酸盐 时空变化 井深 辽河流域 

分 类 号：X523[环境科学与工程—环境工程]