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Assessment of vegetable safety and heavy metal contamination risk in decomposed rape straw and coal gangue soilless culture substrate The research on eco-efficiency and canbon reduction of recycling coal mining solid wastes: a case study of Huaibei City, China Tolerances of Tested Plants to the Heavy Metal Pollution of Coal Gangue Stack in the South Part of Loess Plateau Growth of Ectomycorrhizal Fungi and Mycorrhizal Pinus bungeana Seedlings in Response to Coal Cangue Stress Ecological performance assessment on early plant reclamation in coal gangue yard