Abstract:
In order to study the effect of different planting conditions on changes of soil salinity in the bauxite residue disposal area, a field experiment was conducted to study the salt composition of the soil surface layer (0-20 cm) after 3 years of plant growth, such as Tamarisk, Seepweed, Giant Juncao, Bamboo, Wheat and Ryegrass, and the bauxite residue of unplanted plants was took as a control. The results showed that the planting of Seepweed, Wheat, Giant Juncao and bamboo could significantly reduce soil exchangeable sodium content, increase cation exchange capacity(CEC), and reduce exchangeable sodium percentage (ESP) by 35.10%-66.65%. The soil anion content in the planting conditions was: Bamboo < Wheat < Giant Juncao < Tamarisk < Seepweed < Ryegrass, in which the soil Cl
-/SO
42- ratio of bamboo transplanted soil was 0.99, compared with the control, in a stable state. The ratio of water-soluble Na+ in the soil to the total amount of water-soluble cations and the sodium adsorption ratio (SAR) decreased, among which bamboo transplanted plants had the largest declines, which were 23.95% and 64.3%, respectively. The results showed that planting plants could improve the bauxite residue soil environment and facilitate plant growth, among them, bamboo had the best improvement effect. This provided scientific basis for soil salt regulation during vegetation reconstruction.