Novel predictors of soil genesis following natural weathering processes of bauxite residues

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• 作者：Feng Zhu ; Shengguo Xue ; William Hartley…
• 关键词：Bauxite residue ; Soil genesis ; Natural weathering processes ; Matrix properties
• 刊名：Environmental Science and Pollution Research
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：23
• 期：3
• 页码：2856-2863
• 全文大小：484 KB
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• 作者单位：Feng Zhu (1)
  Shengguo Xue (1)
  William Hartley (2)
  Ling Huang (1)
  Chuan Wu (1)
  Xiaofei Li (1)
  
  1. School of Metallurgy and Environment, Central South University, Changsha, 410083, People’s Republic of China
  2. Crop and Environment Sciences Department, Harper Adams University, Newport, Shropshire, TF10 8NB, UK
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Environment
  Atmospheric Protection, Air Quality Control and Air Pollution
  Waste Water Technology, Water Pollution Control, Water Management and Aquatic Pollution
  Industrial Pollution Prevention
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1614-7499

文摘

Bauxite residue often has chemical and physical limitations to support plant growth, and improving its matrix properties is crucial to support sustainable vegetation in the long term. Spontaneous vegetation colonization on deposits in Central China, over a period of 20 years, has revealed that natural weathering processes may convert bauxite residue to a soil-like medium. Residue samples from different stacking ages were collected to determine the effect of natural processes on matrix properties over time. It was demonstrated that natural processes decreased pH (10.98 to 9.45), electrical conductivity (EC) (3.73 to 0.36 mS/cm), and exchangeable sodium percentage (ESP) (72.51 to 28.99 %), while increasing bulk density (1.91 to 1.39 g/cm3), improving the mean weight diameter (MWD) of water-stable aggregates (0.24 to 0.52 mm), and the proportion of >0.25-mm water-stable aggregates (19.91 to 50.73 %). The accumulation of organic carbon and the reduction of ESP and exchangeable Na had positive effects on soil aggregate formation, while exchangeable Ca and Mg were significantly beneficial to aggregation of water-stable aggregates. Climate, stacking time, and biological factors appear to improve the structure of bauxite residue. Our findings demonstrate soil genesis occurring following natural weathering processes of bauxite residues over time.