Are urban soils similar to natural soils of river valleys?

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• 作者：Jo?l Amossé ; Renée-Claire Le Bayon ; Jean-Michel Gobat
• 关键词：Perturbed ecosystems ; River valley ; Soil gradients ; Soil properties ; Soils on alluvial sediments ; Urban soils
• 刊名：Journal of Soils and Sediments
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：15
• 期：8
• 页码：1716-1724
• 全文大小：663 KB
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• 作者单位：Jo?l Amossé (1)
  Renée-Claire Le Bayon (1)
  Jean-Michel Gobat (1)
  
  1. Laboratory of Soil and Vegetation, University of Neuchatel, Canton de Neuchatel, Emile Argand 11, 2000, Neuchatel, Switzerland
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Soil Science and Conservation
  Environment
  Environmental Physics
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1614-7480

文摘

Purpose Urban soils and soils of river valleys are constituted of heterogeneous materials that have been manipulated, disturbed or transported at different spatial and temporal scales. Despite these similarities, little is known about soil evolution in urban soils and their comparison with natural soils remains therefore highly useful. We hypothesized that, according to their degree of perturbation, urban soils and natural soils of river valleys have similar soil processes related to their structure, physical and chemical characteristics. Materials and methods Using a synchronic approach, we compared two soil gradients, one located in the natural reserve of the Allondon River (canton of Geneva, Switzerland) and the other in and around the city of Neuchatel, Switzerland. A total of five alluvial and 18 urban soil profiles were described according to vegetation type and alluvial terraces formed at different distances from the river for the river valley ecosystem and to soil age for the urban ecosystem. Correlations between soil gradients and classical physical (soil depth, particle-size distribution, coarse fraction) and chemical (Corg, pHH2O, Ptot, Ntot, CaCO3, CEC and C/N ratio) parameters of soils were first tested in order to identify similarities and differences among soil gradients. Data of soil properties were then clustered hierarchically in order to identify soil group classification. Results and discussion Our results showed similarities and differences between soil gradients. In the urban context, soil thickness was positively correlated to soil age, while the coarse fraction, sand content and C/N were negatively correlated to soil age gradient. In soils of the river valley, most of the chemical variables were either negatively (pHH2O and CaCO3) or positively (CEC, Corg and Ntot) correlated to soil distance from the river. These differences between gradients can be mainly explained by parent material, depositional conditions and land use which can influence soil processes. However, alluvial soils were well clustered with two identified urban soil groups according to soil maturity. Evolved alluvial soils far from the river were grouped with natural and near natural urban soils. Conversely, “young-perturbed alluvial soils were most clustered with human-made soils. Conclusions From the two selected soil gradients, soils on alluvial sediments are similar to urban soils in some characteristics. However, parent material, depositional conditions and soil and vegetation interactions on soil processes (e.g. matter cycle, energy flux) still need more investigation. This study contributes to the development of a natural soil reference for urban soils.