Nonpoint Nitrate Contamination of Ground Water in Merrick County, Nebraskaa
Nonpoint Nitrate Contamination of Ground Water in Merrick County, Nebraskaa
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内布拉斯加州梅里克县地下水非点硝酸盐污染
DOI：
10.1111/j.1745-6584.1978.tb03207.x
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发表时间：
1978
期刊：
影响因子：
--
通讯作者：
M. Exner
中科院分区：
文献类型：
--
作者：
R. Spalding;J. Gormly;B. Curtiss;M. Exner
内布拉斯加州梅里克县293个地下水样品的区域分布具有明确的高（10 ~ 20 ppm）、中（10 ~ 20 ppm）和低（<10 ppm）硝酸盐氮浓度模式。在污染存在的地方，硝酸盐氮浓度相对均匀，表明有较大的扩散非点源。SYMAP（灰阶图）显示，灌溉后的粗质土壤与较高的硝态氮水平之间具有非常好的相关性。明显的暗示是，硝酸盐-氮水平直接依赖于分散在较粗质地土壤中的含氮物质的淋滤。商业氮肥在玉米灌溉地区的广泛使用被怀疑是地下水中硝酸盐的主要来源。
The areal distribution of 293 samples from the ground water of Merrick County, Nebraska has definite patterns of high (>20 ppm), intermediate (10–20 ppm), and low (<10 ppm) nitrate-nitrogen concentrations. Where contamination is present the nitrate-nitrogen concentrations are relatively homogeneous indicating large diffuse nonpoint sources. SYMAP (gray-scale mapping) indicates exceptionally good correlation between the irrigated coarse-textured soils and the higher nitrate-nitrogen levels. The obvious implication is that the nitrate-nitrogen levels are directly dependent on the leaching of nitrogenous material dispersed in or on the coarser-textured soils. The widespread use of commercial nitrogen fertilizer on irrigated corn acreages is suspected of being the major contributor of nitrate to the ground water.