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首页> 外文期刊>Environmental Monitoring and Assessment >The impact of small-scale land cover and groundwater interactions on base flow solute and nutrient export in a small agricultural stream
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The impact of small-scale land cover and groundwater interactions on base flow solute and nutrient export in a small agricultural stream

机译：小型土地覆盖与地下水相互作用对小农业溪流碱流动溶质及营养输出的影响

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Central Kentucky could be considered a critical source area of nutrients in water ways because of low permeability soils, fast groundwater flow through bedrock fractures, and pervasive agriculture and development. Of particular concern is rising development in rural areas, which creates mixed land cover (MLC) watersheds, i.e., watersheds with development, agriculture, and other land cover types. MLC watersheds add complexity to spatial and temporal releases of dissolved constituents, leading to less predictable water quality patterns. The goal of this research was to examine the export of dissolved substances from a small, upland MLC catchment in central Kentucky with a focus on how the interaction between discharges from developed agricultural land cover and groundwater influence base flow water quality. Our approach was to spatially sample a representative catchment monthly over 1 year, characterize the major dissolved constituents, and evaluate catchment processes with statistical analyses and Piper diagrams. Principal component analysis, factor analysis, and Piper diagrams indicate base flow was composed of groundwater influenced by two different host rocks and an outfall draining a developed region. Base flow nutrient export was dominated by mixing nitrate-sulfate rich groundwater with ammonium-phosphate-chloride rich outfall drainage. High nitrate groundwater dominated nitrogen export in the winter, whereas high ammonium outfall drainage dominated summer export. Spatial analysis revealed that similar to 10% of the basin may have similar land cover and hydrologic processes, suggesting that MLC catchments are small but collectively significant nitrogen sources to river networks due to development and agriculturally impacted groundwater.
机译：由于低渗透性土壤，通过基岩骨折，普遍存在的农业和发展，中央肯塔基州中央肯塔基州的营养源区的营养源区是营养成分的关键来源区。特别关注的是农村地区的发展崛起，它创造了混合陆地覆盖（MLC）流域，即流域，发展，农业和其他土地覆盖类型。 MLC流域增加了复杂的溶解成分的空间和颞释放，导致不可预测的水质模式。本研究的目标是在肯塔基州中部的一个小型Upland MLC集水区的溶解物质的出口侧重于如何从发达的农业陆地覆盖和地下水影响到基础流量水质之间的互动。我们的方法是在每月超过1年的代表性集水区进行空间样本，表征主要溶解的成分，并评估统计分析和吹笛装置的集水过程。主要成分分析，因子分析和吹笛装置表示基础流量由受两个不同主体岩石的地下水组成，以及排出发达区域的排水口。基础流量营养输出通过将硝酸硫酸盐富含氯化铵的出口排水混合来支配。冬季高硝酸盐地下水占氮气出口，而高铵排出排水占夏季出口。空间分析表明，类似于10％的盆地可能具有类似的陆地覆盖和水文过程，表明MLC集水量小但由于发展和农业影响地下水而统称到河网的氮源。

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