文献类型： 外文期刊

作者： Feng, Jiayi ¹ ; Yang, Yuantong ¹ ; Ruan, Kejin ¹ ; Wu, Daoming ¹ ; Xu, Yanggui ² ; Jacobs, Douglass F. F. ³ ; Zeng, Shucai ¹ ;

作者机构： 1.South China Agr Univ, Coll Forestry & Landscape Architecture, Guangzhou 510642, Peoples R China

2.Guangdong Acad Agr Sci, Inst Agr Resources & Environm, Guangzhou 510640, Peoples R China

3.Purdue Univ, Dept Forestry & Nat Resources, W Lafayette, IN 47907 USA

关键词： Mining wasteland restoration; Solid waste recycling; Sewage sludge compost; Eucalyptus urophylla; Heavy metals

期刊名称：JOURNAL OF SOILS AND SEDIMENTS （ 影响因子：3.6； 五年影响因子：3.8 ）

ISSN： 1439-0108

年卷期： 2023 年 23 卷 4 期

页码：

收录情况： SCI

摘要： PurposePoor structure, nutrient deficiency, and acidification are core factors restricting the reclamation of rare earth mining wasteland soil (REMWS). Sewage sludge, bagasse, and molybdenum tailings, all of which need proper disposal, have great potentials in REMWS reclamation. The goal of this study was to explore the remediation effect on rare earth mining wasteland soil with the combined application of sewage sludge compost (SSC), bagasse, and modified molybdenum tailings (MMT).Materials and methodsSSC (T1), SSC + bagasse (T2), and SSC + bagasse + MMT (T3) were applied in REMWS as amendments in a 4-month pot experiment, and their effects on REMWS properties and heavy metals (HMs) toxicity were tested with Eucalyptus urophylla, which grows fast, resists environment stress, and is a promising plant in REMWS reclamation.ResultsThe application of SSC (T1) improved REMWS fertility, but increased Cu, Zn, Cd, and Ni contents in soil and E. urophylla seedlings, and inhibited E. urophylla growth. Bagasse application (T2) alleviated growth inhibition and further addition of bagasse + MMT (T3) significantly improved E. urophylla growth. Moreover, T3 improved soil physical properties, organic carbon content, pH, and reduced soil HMs bioavailability and plant HMs content as compared to T1 and T2. Structural equation modeling results revealed that plant nutrient accumulation increased plant HMs accumulation, the latter inhibited plant nutrient accumulation in turn, and soil pH played a key role in retarding HMs uptake and improving E. urophylla growth and nutrients uptake.ConclusionThese results suggested that the combined application of SSC, bagasse, and MMT is an effective approach for REMWS amelioration and land disposal of solid waste resources.