摘要
以赣南某废弃离子型稀土矿为研究对象,根据生产功能将其分为采矿区、浸矿区和对照区,探讨不同功能区土壤的退化特征。与对照区相比,采矿区和浸矿区土壤的田间持水量和总孔隙度显著降低且土壤容重显著增加。采矿区与浸矿区土壤有机质、碱解氮和有效磷含量均显著低于对照区,处于极度缺乏水平。浸矿区土壤的铵态氮显著高于对照区和采矿区,浸矿剂残留量大。此外,浸矿区土壤酸化严重。对照区、采矿区和浸矿区土壤的稀土元素总量分别为江西省土壤背景值的8.95倍、5.84倍和1.12倍,但土壤常规重金属含量较低。因此,浸矿区是废弃稀土矿区退化最严重的区域,且土壤物理结构差、速效养分严重缺乏、土壤酸化严重以及浸矿剂残留是其主要的退化特征。
Taking an abandoned ion-type rare earth mine in southern Jiangxi Province as the research object,it is divided into mining area,leaching area and control area according to its production function,and the characteristics of soil degradation in different functional areas were discussed. Compared with the control area,the field water capacity and total porosity of the soil in the mining area and the leaching area were significantly reduced and the soil bulk density increased significantly. The content of soil organic matter,alkali-hydrolyzable nitrogen and available phosphorus in the mining and leaching area were significantly lower than those in the control area,which was in extremely deficient level. The ammonium nitrogen in the leaching area soil was significantly higher than that in the control and mining area,and the residual of leaching agent amount was large. In addition,the soil acidification in the mining area is serious. The total amount of rare earth elements in the soil of the control area,the mining area and the leaching area were respectively 8.95,5.84 and 1.12 times of the soil background value in Jiangxi Province,but the conventional heavy metal content of the soil was low. In summary,the leaching area is the most severely degraded area in the abandoned rare earth mining area,and the main degradation characteristics of the soil are the poorly physical structure of the soil,the severe lack of available nutrients,the severe soil acidification and the residual leaching agent.
作者
罗杰
张嵚
罗密密
万广越
赵小敏
陈秀龙
Luo Jie†;Zhang Qin†;Luo Mimi;Wan Guangyue;Zhao Xiaomin;Chen Xiulong(School of Land Resource and Environment,Jiangxi Agricultural University/Key Laboratory of Poyang Lake Basin Ag-ricultural Resource and Ecology of Jiangxi Province,Nanchang 330045,China)
出处
《中国稀土学报》
EI
CAS
CSCD
北大核心
2022年第2期329-338,共10页
Journal of the Chinese Society of Rare Earths
基金
江西省重点研发计划项目(20181ACG70006)
江西省教育厅重点项目(GJJ170244)资助。
关键词
土壤养分
浸矿剂残留
稀土元素含量
重金属
soil nutrient
leaching agent residue
rare earth element content
heavy metal
