Sodium accumulation in calcareous roadside soils

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• 作者：M. Catherine Eimers ; Kelli-Nicole Croucher ; Shanel M. Raney…
• 关键词：Roadsalt ; Urban ; Calcareous parent material ; Soil quality
• 刊名：Urban Ecosystems
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：18
• 期：4
• 页码：1213-1225
• 全文大小：1,501 KB
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• 作者单位：M. Catherine Eimers (1)
  Kelli-Nicole Croucher (2)
  Shanel M. Raney (2)
  Melinda L. Morris (1)
  
  1. Department of Geography, Trent University, Peterborough, Ontario, K9J 7B8, Canada
  2. Environmental and Life Sciences Graduate Program, Trent University, Peterborough, Ontario, K9J 7B8, Canada
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Ecology
  Environmental Management
  Nature Conservation
  
• 出版者：Springer Netherlands
• ISSN：1573-1642

文摘

Sodium chloride (roadsalt) is routinely applied to roadways during the winter in many parts of the world to reduce ice formation and improve winter driving conditions. While increases in chloride (Cl?/sup>) levels in waterways influenced by roads and Cl?/sup> impacts on roadside vegetation have been widely reported, there has been relatively little research on the fate of sodium (Na+) and its impact on soils. Soils in the most heavily populated area of southern Ontario, Canada, are typically rich in calcium (Ca2+) and we predicted that high native Ca2+ levels in this region would limit Na+ accumulation in roadside soils. In order to investigate the extent of Na+ accumulation in calcareous soils, we compared soil Na+ levels adjacent to roads of three different classes but having the same parent material, including a Freeway, three High Capacity Arterial roads and three Low Capacity Collector roads, as road salt loadings are highly dependent on traffic volume. Soil Na+ levels were significantly higher adjacent to the two-lane (mean 0.22-.50 meq/100 g) compared with the single-lane minor roads (0.013-.10 meq/100 g), and exchangeable soil Na+ was negatively correlated with Ca2+, Mg2+ and K+, suggesting that not only does Na+ accumulate in calcareous soils, but it also displaces all three nutrient base cations. Nevertheless, relatively low soil Na+ levels adjacent to the Low Capacity Collector roads, which are similar to levels reported for control soils in other studies, suggest that high base saturation in these soils may limit Na+ accumulation, and that road salt application rates at the minor roads are not high enough to cause Na+ accumulation. Keywords Roadsalt Urban Calcareous parent material Soil quality