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Land-use practices influence nutrient concentrations of southwestern Ontario streams

机译：土地使用方式影响西南安大略溪流的养分浓度

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Human activities have transformed the landscape and altered geochemical pathways through intensive land uses such as agriculture and urbanization. This study quantified the individual and cumulative influence of land-use drivers on nutrient concentrations for 29 Ontario tributaries flowing to Lake Erie and Lake Huron. For each watershed, measures of agriculture, urbanization and population served by municipal sewage treatment plants were quantified at multiple spatial scales; stream-water nutrients (nitrogen, N, and phosphorus, P) were sampled on 10 occasions between May and November 2012, and were also compiled from government records for concurrent (2012) and prior (2007, 2008, 2011) years. Application of ordinary least squares regression analysis showed that in 2012, concentrations of N and P (total as well as dissolved forms) were primarily driven by sewage treatment and urban activity, with agricultural activity as a secondary influence on variability. Evaluation of model predictive performance under scenarios of varying climate (wet, dry and 'normal' conditions) and spatial coverage (i.e. broader than the original sampling sites) showed that stream nitrogen concentrations could be predicted, on average, 36-85% of the time; phosphorus forms were, however, not successfully predicted, likely due to differences in sampling frequency relative to runoff events. The finding that both urban and agricultural land-use activities influence nutrient concentrations in Canadian tributaries to lakes Erie and Huron underscores the need to reduce both point and non-point inputs in order to mitigate eutrophication of downstream lakes.
机译：人类活动通过农业和城市化等土地集约利用改变了地貌，改变了地球化学途径。这项研究量化了流向伊利湖和休伦湖的29个安大略支流的土地利用驱动因素对养分浓度的个体和累积影响。对于每个流域，在多个空间尺度上对市政污水处理厂服务于农业，城市化和人口的措施进行了量化；在2012年5月至2012年11月之间，共抽取了10次采样，采集了河水营养素（氮，氮和磷，磷），并从政府记录中同时（2012年）和之前（2007年，2008年，2011年）进行了汇总。普通最小二乘回归分析的应用表明，2012年氮和磷的浓度（全部和溶解形式）主要受污水处理和城市活动的驱动，而农业活动对变异性具有次要影响。在气候变化（潮湿，干燥和“正常”状况）和空间覆盖率（即比原始采样点更宽）的情景下对模型预测性能的评估表明，可以预测平均氮含量的36-85％。时间;然而，磷的形式未能成功预测，可能是由于相对于径流事件的采样频率不同。城市和农业土地利用活动均会影响加拿大伊利湖和休伦湖支流的养分含量，这一发现突显了减少点和非点输入以减轻下游湖泊富营养化的需要。

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