摘要
通过对关中盆地225个潜水样点进行采样分析,应用地质统计学方法中的变异函数和克里格插值工具对盆地地下水的硝酸盐含量的空间变异和分布特征进行研究。研究结果表明:关中盆地地下水硝酸盐含量的空间相关性属中等程度,随机性因素对于该区地下水硝酸盐含量分布的影响较大,人类活动在该区造成的硝酸盐污染已是区域性的;关中盆地地下水的硝酸盐含量普遍较高,总体分布特点为东部高于西部,由南至北有逐渐递增的趋势;盆地中东部的礼泉-兴平-武功一带和三原-富平-蒲城一带的阶地及黄土台塬区是地下水硝酸盐含量超标最为严重的区域。由于是关中重要的农灌区,施肥灌溉等农业活动是造成这两个区域地下水硝酸盐激增的主要原因。
Based on the analyses of 225 phreatic water samlples in Gauanzhong Basin, semivariogram and Kriging methods in geostatistics were used to study the characteristics of spatial variability and distribution of nitrate content of groundwater in Guanzhong Basin. The results revealed that there is a medium spatial correlation in the distribution of nitrate content of ground water in the region, on which random factors have a significant effect. The nitrate pollution in groundwater in the Basin is a regional problem. On the whole, the nitrate content of groundwater in the area is considerably high. The content in the eastern part is higher than that of the western part. Meanwhile, from south to north there is a gradually increasing tendency in the variation of the content. Two loess tablelands and their periphery terraces in the basin should be pay more attention due to extremely high nitrate content in grouondwater. Agricultural activities such as fertilization and irrigation are the main reasons be- cause these areas are important irrigation fields in the basin.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2008年第10期152-155,共4页
Journal of Arid Land Resources and Environment
基金
国家重点基础研究发展规划项目"黄河流域水资源演化规律与可再生性维持机理"(G19990436)资助
关键词
硝酸盐
空间变异
地下水
关中盆地
nitrate
groundwater
spatial variation
Guanzhong Basin
