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 limiting factors to establishing grassland on residue. Following restoration several plant species can grow on amended residue.
摘要
赤泥是氧化铝工业生产过程排放的强碱性固体废物,盐碱性强和营养元素匮乏是影响赤泥堆场 植物生长的主要限制因素。对赤泥堆场的长期野外研究,分析基质改良对赤泥理化特性和植物多样性 的影响,结果表明:施用石膏后,赤泥pH 和可交换钠明显降低,黑麦草和红牛轴草发芽指数分别由 22%和42%提高到100%;施用堆肥显著提高赤泥碳、氮、磷等养分元素含量;赤泥改良1 年后,绒 毛草主要元素含量与普通草地植物元素含量相似;基质改良5 年后,绒毛草和红牛轴草钠含量显著降 低,分别由0.6%和0.58%降低到0.3%和0.1%,赤泥堆场优势物种为菊科、豆科和禾本科植物。研究 结果对赤泥土壤化研究及堆场生态修复实践具有重要的参考价值。
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Foundation item: Projects(41877551, 41842020) supported by the National Natural Science Foundation of China;Project supported by the Science Foundation Ireland 17/CDA/4778
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Courtney, R., Xue, Sg. Rehabilitation of bauxite residue to support soil development and grassland establishment. J. Cent. South Univ. 26, 353–360 (2019). https://doi.org/10.1007/s11771-019-4007-9
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DOI: https://doi.org/10.1007/s11771-019-4007-9
Key words
- bauxite residue
- substrate amendment
- soil development
- soil formation in bauxite residue
- vegetation establishment