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首页> 外文期刊>Ground water >Effects of Land Use on Ground Water Quality in the Anoka Sand Plain Aquifer of Minnesota
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Effects of Land Use on Ground Water Quality in the Anoka Sand Plain Aquifer of Minnesota

机译：明尼苏达州阿诺卡沙平原含水层土地利用对地下水水质的影响

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We began a study, in 1996, to compare ground water quality under irrigated and nonirrigated agriculture, sewered and nonsewered residential developments, industrial, and nondeveloped land uses. Twenty-three monitoring wells were completed in the upper meter of an unconfined sand aquifer. Between 1997 and 2000, sampling occurred quarterly for major ions, trace inorganic chemicals, volatile organic compounds (VOCs), herbicides, and herbicide degradates. On single occasions, we collected samples for polynuclear aromatic hydrocarbons (PAHs), perchlorate, and coliform bacteria. We observed significant differences in water chemistry beneath different land uses. Concentrations of several trace inorganic chemicals were greatest under sewered urban areas. VOC detection frequencies were 100% in commercial areas, 52% in sewered residential areas, and <10% for other land uses. Median nitrate concentrations were greatest under irrigated agriculture (15,350μg/L) and nonsewered residential areas (6080μg/L). Herbicides and degradates of acetanilide and triazine herbicides were detected in 86% of samples from irrigated agricultural areas, 68% of samples from nonirrigated areas, and <10% of samples from other land uses. Degradates accounted for 96% of the reported herbicide mass. We did not observe seasonal differences in water chemistry, but observed trends in water chemistry when land use changes occurred. Our results show land use is the dominant factor affecting shallow ground water quality. Trend monitoring programs should focus on areas where land use is changing, while resource managers and planners must consider potential impacts of land use changes on ground water quality.
机译：我们于1996年开始进行一项研究，比较灌溉和非灌溉农业，下水道和非下水道住宅开发区，工业区和未开发土地用途下的地下水水质。在无限制的砂层含水层的上部仪表中完成了23口监测井。在1997年至2000年之间，每季度对主要离子，痕量无机化学物质，挥发性有机化合物（VOC），除草剂和除草剂降解物进行采样。在个别情况下，我们收集了多核芳香烃（PAH），高氯酸盐和大肠菌的样本。我们观察到不同土地利用下水化学的显着差异。在下水道的城市地区，几种微量无机化学物质的浓度最高。 VOC检测频率在商业区为100％，在下水道的居民区为52％，对于其他土地用途<10％。在灌溉农业（15,350μg/ L）和非下水道居住区（6080μg/ L）下，硝酸盐的中位数浓度最高。在灌溉的农业地区中，有86％的样品中检出了除草剂以及对乙酰苯胺和三嗪类除草剂的降解，非灌溉地区的样品中有68％的样品被检出，其他土地用途中的样品中<10％的样品被检出。降解物占报告的除草剂质量的96％。我们没有观察到水化学的季节性差异，但是观察到土地利用发生变化时水化学的趋势。我们的结果表明，土地利用是影响浅层地下水水质的主要因素。趋势监测计划应将重点放在土地使用发生变化的区域，而资源经理和规划人员必须考虑土地使用变化对地下水水质的潜在影响。

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