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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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Salt ions accumulation and distribution characteristics of pioneer plant species at a bauxite residue disposal area, China
HUANG Nan(黄楠)1, TANG Lu(唐璐)1, ZHU Feng(朱锋)1, WU Chuan(吴川)1, HARTLEY William2, ZHOU Jing-ju(周晶菊)1, XUE Sheng-guo(薛生国)1

1. School of Metallurgy and Environment, Central South University, Changsha 410083, China;
2. Crop and Environment Sciences Department, Harper Adams University, Newport, Shropshire,TF10 8NB, United Kingdom

Abstract:Bauxite residue disposal areas (BRDAs) are physically degraded and hostile to plant growth. Nevertheless, natural plant colonization was observed in an abandoned BRDA in Central China. The pioneer plant species at the disposal area were identified, whilst distribution characteristics of salt ions such as Na+, K+, and Ca2+ in plant tissues and rhizosphere residues were investigated. The mean concentration of exchangeable Na+ in the rhizosphere soils was 19.5 cmol/kg, which suggested that these pioneer plants had relatively high salinity resistance. Sodium content varied from 0.84 cmol/kg (Digitaria sanguinalis) to 39.7 cmol/kg (Kochia scoparia), whilst K to Na ratio varied from 0.71 (Myricaria bracteata) to 32.39 (Digitaria sanguinalis) in the shoots, which demonstrated that the salinity tolerance mechanisms of these pioneer species differed significantly. Accumulation factors of Na+ in local plant species ranged from 0.04 (D. sanguinalis) to 3.29 (M. bracteata), whilst the translocation factor varied from 0.13 (D. sanguinalis) to 2.92 (M. bracteata). The results suggested that four pioneer plant species including K. scoparia, M. bracteate, Cynodon dactylon and D. sanguinalis could be suitable for revegetation at other disposal areas.

 

Key words: bauxite residue disposal area; pioneer plants; salt ions; soil formation in bauxite residue; revegetation

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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