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| 赣南某原地浸析稀土尾矿复垦前后土壤质量变化 |
| Soil quality changes of rare earth tailings before and after reclamation in south Jiangxi Province, China |
| 投稿时间：2018-06-26 |
| DOI：10.13254/j.jare.2018.0042 |
| 中文关键词: 复垦，离子型稀土，浸矿剂，酸化，重金属，土壤养分 |
| 英文关键词: reclamation, ion-adsorption type rare earth, leaching agent, acidification, heavy metal, soil nutrient |
| 基金项目:国家重点研发计划项目（2017YFD0301601-01）；赣鄱英才“555”领军人才项目（2012）；江西省博士后科研项目（2015KY23）；江西省教育厅重点项目（GJJ170244）；江西省研究生创新专项资金项目（YC2016-S181） |
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| 中文摘要: |
| 为探究土地复垦对原地浸析稀土尾矿0~20 cm土层土壤质量的影响，以赣州市龙南县某原地浸析离子型稀土尾矿为研究对象，从浸矿剂残留、土壤酸碱性、土壤养分和重金属污染等4个方面对比复垦前后土壤质量变化，探讨稀土尾矿土地复垦的效果与潜在问题。结果表明：复垦后土壤的浸矿剂NH+4含量从89.00 mg·kg-1降低至8.70 mg·kg-1，土壤pH由4.15增加至5.16，而土壤肥力综合指数则由0.44降低至0.31。内梅罗综合指数评价结果显示，复垦前后土壤5种非稀土重金属的污染水平均为清洁水平；而地累积指数评价结果显示，复垦前后土壤稀土元素总量的污染水平分别为无污染-中度污染水平和无污染水平。研究表明，土地复垦可显著改善该矿区土壤的浸矿剂残留、土壤酸化和重金属污染问题，但土壤肥力衰退问题没有明显改善。 |
| 英文摘要: |
| In order to study the effect of land reclamation on topsoil quality in in-situ leaching rare earth tailings, an in-situ leaching ionadsorption type rare earth tailings from Longnan County Ganzhou City was studied. The soil quality changes before and after reclamation were investigated through NH4+ concentration, soil pH value, soil nutrient content and heavy metal content. The results showed that after reclamation the concentration of NH4+ decreased from 89.00 mg·kg-1 to 8.70 mg·kg-1, and soil pH increased from 4.15 to 5.16. The comprehensive index of soil fertility decreased from 0.44 to 0.31. The Nemerow integrated pollution index of non-rare earth heavy metal indicated that the pollution level of tailing was clean before and after reclamation, but the geoaccumulation index of rare earth heavy metal showed that the pollution levels of tailing before and after reclamation were unpolluted to moderately polluted and unpolluted, respectively. Hence, land reclamation could significantly alleviate leaching agent residue, soil acidification and heavy metal pollution, but did not alleviate soil fertility degradation. |
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