Huang Nan, Wu Hao, Zhu Feng, Cheng Qingyu, Xue Shengguo
School of Metallurgy and Environment, Central South University, Changsha, 410083, China.
Bull Environ Contam Toxicol. 2022 Jul;109(1):135-141. doi: 10.1007/s00128-022-03479-6. Epub 2022 Mar 8.
The deficiencies of certain nutrients limit plant growth in bauxite residue disposal areas. In this study, residue samples at different depths (0-2 cm, 2-10 cm, 10-20 cm, 20-40 cm, and 40-60 cm) and stacking ages were collected to analyze the changes of nutritional conditions following natural vegetation encroachment processes. With the encroachment of natural vegetation, the nutrient components improved greatly. The contents of organic carbon, total nitrogen, and available phosphorus increased from 5.6 g/kg to 10.8 g/kg, 0.07 g/kg to 0.73 g/kg, and 6.3 mg/kg to 24.9 mg/kg, respectively. With the increase of natural weathering time, microbial carbon, nitrogen, and phosphorus increased significantly. Natural weathering process and vegetation encroachment improved the circulation and accumulation of nutrient substances in bauxite residues.
某些养分的缺乏限制了铝土矿残渣堆放区的植物生长。在本研究中，采集了不同深度（0 - 2厘米、2 - 10厘米、10 - 20厘米、20 - 40厘米和40 - 60厘米）和堆放年限的残渣样本，以分析自然植被入侵过程中营养状况的变化。随着自然植被的入侵，养分成分有了很大改善。有机碳、总氮和有效磷的含量分别从5.6克/千克增加到10.8克/千克、0.07克/千克增加到0.73克/千克、6.3毫克/千克增加到24.9毫克/千克。随着自然风化时间的增加，微生物碳、氮和磷显著增加。自然风化过程和植被入侵改善了铝土矿残渣中营养物质的循环和积累。
