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中南大学学报(英文版)

Journal of Central South University

Vol. 26    No. 2    February 2019

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Rehabilitation of bauxite residue to support soildevelopment and grassland establishment
Ronan COURTNEY1, XUE Sheng-guo(薛生国)2

1. Department of Biological Sciences and Bernal Institute, University of Limerick, Co. Limerick, Ireland;
2. School of Metallurgy and Environment, Central South University, Changsha 410083, China

Abstract:Rehabilitation (amendment and vegetation establishment) on bauxite residue is viewed as a promising strategy to stabilize the surface and initiate soil development. However, such approaches are inhibited by high pH, high exchangeable sodium (ESP) and poor nutrient status. Amendment with gypsum is effective in improving residue physical and chemical properties and promoting seed establishment and growth. Application of organics (e.g. compost) can address nutrient deficiencies but supplemental fertilizer additions may be required. A series of germination bioassays were performed on residue to determine candidate species and optimum rehabilitation application rates. Subsequent field trials assessed establishment of grassland species Holcus lanatus and Trifolium pratense as well as physical and chemical properties of amended residue. Follow up monitoring over five years assessed elemental content in grassland and species dynamics. With co-application of the amendments several grassland species can grow on the residue. Over time other plant species can invade the restored area and fast growing nutrient demanding grasses are replaced. Scrub species can establish within a 5 Yr period and there is evidence of nutrient cycling. High pH, sodicity and nutrient deficiencies are the major limit ing factors to establishing grassland on residue. Following restoration several plant species can grow on amended residue.

 

Key words: bauxite residue; substrate amendment; soil development; soil formation in bauxite residue; vegetation establishment

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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