Contrasting long-term trends of chloride levels in remote and human-disturbed lakes in south-central Ontario, Canada

IF 1.1 4区环境科学与生态学 Q4 LIMNOLOGY

Lake and Reservoir Management Pub Date : 2020-10-07 DOI:10.1080/10402381.2020.1820642

H. Yao, A. Paterson, A. James, C. McConnell, T. Field, R. Ingram, Dejian Zhang, S. Arnott, S. Higgins

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引用次数: 10

Abstract

Abstract Yao H, Paterson AM, James AL, McConnell C, Field T, Ingram R, Zhang D, Arnott SE, Higgins SN. 2020. Contrasting long-term trends of chloride levels in remote and human-disturbed lakes in south-central Ontrario, Canada. Lake Reserv Manage. XX:XXX–XXX. We examined a 41 yr data record from 4 monitored lakes in south-central Ontario, Canada, to demonstrate and explain long-term changes in chloride (Cl) loading and in-lake concentrations in relation to the degree of watershed disturbance. A mass balance calculation for each lake was used to determine ungauged shoreline loads. Correlations of lake Cl concentrations with each of 3 major contributing sources (inputs from inflowing streams, atmospheric deposition, and ungauged shoreline areas) revealed the contribution of each source to Cl trends at each lake. Areal loads (Cl load per year per unit area) showed the relative intensity of the contributions. Two lakes (Red Chalk, Plastic) with relatively undisturbed watersheds showed declining trends in atmospheric deposition, stream loads, lake export, and lake Cl concentrations, whereas 2 lakes (Harp, Dickie) with disturbed watersheds showed increased stream loads, lake export, and lake concentrations, despite long-term declines in atmospheric deposition. This contrasting trend was related to increased Cl concentrations in inflowing streams, which were caused by increased residential development and road salt applications. The ungauged shoreline loads in the disturbed watersheds made a contribution as high as 80% to total Cl loads. As increasing Cl concentrations have implications for aquatic biota, even at the relatively low concentrations observed in the study lakes, these findings highlight the need for improved management of road salt applications. Our results confirm that even relatively remote lakes within the Canadian Shield are potentially at risk from watershed disturbances that are disrupting the natural loading of Cl to inland waters.

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对比加拿大安大略省中南部偏远湖泊和人为干扰湖泊氯化物水平的长期趋势

摘要姚H，帕特森AM，詹姆斯AL，麦康奈尔C，菲尔德T，英格拉姆R，张D，阿诺特SE，希金斯SN.2020。对比加拿大安大略省中南部偏远湖泊和人为干扰湖泊中氯化物水平的长期趋势。湖泊保护区管理。XX： XXX–XXX。我们检查了一个41 加拿大安大略省中南部4个监测湖泊的年数据记录，以证明和解释氯化物（Cl）负荷和湖泊浓度与流域扰动程度的长期变化。每个湖泊的质量平衡计算用于确定未计量的海岸线荷载。湖泊Cl浓度与3个主要贡献源（流入溪流、大气沉积和未经测量的海岸线区域的输入）的相关性揭示了每个来源对每个湖泊Cl趋势的贡献。面积负荷（单位面积每年的Cl负荷）显示了贡献的相对强度。两个流域相对未受干扰的湖泊（Red Chalk，Plastic）在大气沉积、河流负荷、湖泊输出和湖泊Cl浓度方面呈现下降趋势，而两个流域受干扰的湖（Harp，Dickie）尽管大气沉积长期下降，但河流负荷、湖输出和湖泊浓度仍有所增加。这种对比趋势与流入溪流中Cl浓度的增加有关，这是由住宅开发和道路盐应用的增加引起的。受干扰流域的未计算海岸线荷载对总Cl荷载的贡献高达80%。由于Cl浓度的增加对水生生物群有影响，即使在研究湖泊中观察到的浓度相对较低的情况下，这些发现也突出了改善道路盐应用管理的必要性。我们的研究结果证实，即使是加拿大地盾内相对偏远的湖泊，也可能面临流域扰动的风险，这些扰动破坏了Cl向内陆水域的自然负荷。

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来源期刊

Lake and Reservoir Management 环境科学-海洋与淡水生物学

自引率

6.70%

发文量

期刊介绍： Lake and Reservoir Management (LRM) publishes original, previously unpublished studies relevant to lake and reservoir management. Papers address the management of lakes and reservoirs, their watersheds and tributaries, along with the limnology and ecology needed for sound management of these systems. Case studies that advance the science of lake management or confirm important management concepts are appropriate as long as there is clearly described management significance. Papers on economic, social, regulatory and policy aspects of lake management are also welcome with appropriate supporting data and management implications. Literature syntheses and papers developing a conceptual foundation of lake and watershed ecology will be considered for publication, but there needs to be clear emphasis on management implications. Modeling papers will be considered where the model is properly verified but it is also highly preferable that management based on the model has been taken and results have been documented. Application of known models to yet another system without a clear advance in resultant management are unlikely to be accepted. Shorter notes that convey important early results of long-term studies or provide data relating to causative agents or management approaches that warrant further study are acceptable even if the story is not yet complete. All submissions are subject to peer review to assure relevance and reliability for management application.