• 关键词：离子型稀土矿尾砂地  土壤修复  有机改良剂  生物炭  杂交狼尾草  红麻

• 基金项目：国家重点研发计划（No.2018YFD0800700）；国家自然科学基金（No.41771343）；广东省科技计划项目（No.2016A020221013，2014A050503032）；高等学校学科创新引智计划（No.B18060）

• 陈莺燕
• 中山大学环境科学与工程学院, 广州 510275

• 刘文深
• 中山大学环境科学与工程学院, 广州 510275

• 丁铿博
• 中山大学环境科学与工程学院, 广州 510275

• 汤叶涛
• 1. 中山大学环境科学与工程学院, 广州 510275;2. 广东省环境污染控制与修复技术重点实验室(中山大学), 广州 510275;3. 广东省土壤重金属污染修复工程技术研究中心(中山大学), 广州 510275

• 仇荣亮
• 1. 中山大学环境科学与工程学院, 广州 510275;2. 广东省环境污染控制与修复技术重点实验室(中山大学), 广州 510275;3. 广东省土壤重金属污染修复工程技术研究中心(中山大学), 广州 510275

• 摘要：选取有机改良剂稻草、锯末、城市污泥、鸡粪及麻杆生物炭进行单施或配施，通过室内杂交狼尾草和红麻盆栽实验，探讨有机改良剂及同时生物炭对离子型稀土矿尾砂地土壤的改良效果.结果表明：①单施4种有机改良剂均能显著提高杂交狼尾草生物量，其中鸡粪处理效果最好；但鸡粪处理中实验前后土壤中有机质亏损高达73.8%，其改良效果持久性较低；而锯末处理中有机质仅亏损16.0%，改良效果持久性更佳.②相对于单施鸡粪，配施麻杆生物炭或锯末均显著增加红麻生物量，显著提高土壤中有机质的含量及土壤持水性，减缓了营养元素的流失；且明显改善有机质亏损，尤其配施锯末后土壤有机质亏损降至45.4%，提高了改良效果持久性.因此，鸡粪配比麻杆生物炭或锯末处理改良长效性较好，环境风险低，可应用于稀土尾砂地基质改良，加快植被复垦.

• Abstract：The severe exploration of ionic rare earth mine has resulted in a large area of mine tailings abandoned in south China. This has also caused serious vegetation loss, water and soil erosion, and land collapse, which pose a potential risk to the local environment and habitants. In general the rare earth mine tailings have poor soil properties with a lack of organic matter and nutrients, markedly limiting the growth of plants and ecological restoration. Therefore, there is a need to improve the soil properties for accelerating the revegetation process through artificial interference such as soil amendments. In this paper, rare earth mine tailings were amended with four organic materials (i.e. rice straw, sawdust, municipal sludge, chicken manure) and biochar derived from kenaf (Hibiscus cannabinus) straw prior to plantation. Two grass species (i.e. Pennisetumamericanum×P. purpur hybrid and H. cannabinus) were grown in the amended tailings to study their effects on soil properties improvement. The results showed that ① single application of four organic amendments significantly increased the biomass of Pennisetumamericanum×P. Purpur, in which chicken manure exhibited the best effect. However, addition of chicken manure resulted in a higher loss (73.8%) of organic matter compared to sawdust (16.0%), suggesting a weaker organic matter holding durability of the former. ② Compared to the single application, a combination of chicken manure with biochar or sawdust significantly enhanced the growth of H. cannabinus, and increased organic matter content and soil water holding capacity as well. Moreover, this combination amendments mitigated the loss of soil nutrients and organic matter (45.4%). Therefore, we suggest that amendments of chicken manure combined with biochar or sawdust could be a useful means, regarding their better organic matter holding durability and low environmental risk, for revegetation of rare earth mine tailings.

• Key words：ionic rare earth mine tailings  soil remediation  organic amendment  biochar  Pennisetumamericanum × P.purpur hybrid  Hibiscus cannabinus

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