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首页> 外文期刊>Journal of the American Water Resources Association >DROUGHT EFFECTS ON WATER QUALITY IN THE SOUTH PLATTE RIVER BASIN, COLORADO
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DROUGHT EFFECTS ON WATER QUALITY IN THE SOUTH PLATTE RIVER BASIN, COLORADO

机译：科罗拉多州南普拉特河流域干旱对水质的影响

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摘要

Twenty-three stream sites representing a range of forested, agricultural, and urban land uses were sampled in the South Platte River Basin of Colorado from July through September 2002 to characterize water quality during drought conditions. With a few exceptions, dissolved ammonia, Kjeldahl nitrogen, total phosphorus, and dissolved orthophosphate concentrations were similar to seasonal historical levels in all land use areas during the drought. At some agricultural sites, decreased dilution of irrigation return flow may have contributed to higher concentrations of some nutrient species, increased primary productivity, and higher dissolved oxygen concentrations. At some urban sites, decreased dilution of base flow and wastewater treatment plant effluent may have contributed to higher dissolved nitrite-plus-nitrate concentrations, increased primary productivity, and higher dissolved oxygen concentrations. Total pesticide concentrations in urban and agricultural areas were not consistently higher or lower during the drought. At most forested sites, decreased dilution of ground water-derived calcium bicarbonate type base flow likely led to elevated pH and specific-conductance values. Water temperatures at many of the forested sites also were higher, contributing to lower dissolved oxygen concentrations during the drought.
机译：2002年7月至2002年9月，在科罗拉多州的南普拉特河流域采样了代表森林，农业和城市土地用途的23个溪流站点，以表征干旱条件下的水质。除少数例外，干旱期间所有土地利用地区的溶解氨，凯氏定氮，总磷和正磷酸盐浓度与季节性历史水平相似。在某些农业场所，灌溉回流稀释的降低可能导致某些营养物质浓度升高，初级生产力提高和溶解氧浓度升高。在某些城市地区，减少的基本流量和废水处理厂废水的稀释度可能导致较高的溶解性亚硝酸盐加硝酸盐浓度，增加的初级生产率和较高的溶解氧浓度。在干旱期间，城市和农业地区的农药总浓度并非始终处于较高或较低的水平。在大多数森林地带，地下水衍生的碳酸氢钙类型基流的稀释度降低可能导致pH值和电导率值升高。许多森林地带的水温也较高，导致干旱期间的溶解氧浓度降低。

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