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Effects of Mixing Soil and Applying Fertilizer Measures on Physicochemical Properties of Iron Tailings and Growth of Pinus tabulaeformis and Pinus sylvestris var. mongolica Seedlings Temporal and Spatial Variation of Soil Microbes and Enzyme Activities in Iron Tailings under Natural Restoration and Plantation Effects of fertilizer and Rhizobium inoculation on alfalfa growth on mine tailings and the physicochemical properties of iron tailings Effects of Shading Treatments on Chlorophyll Fluorescence Characteristics of Sabina vulgaris Seedlings Grown in Iron Tailings Media Isolation and Biolog identification of the high-efficiency azotobacter from iron tailing under different vegetation restoration modes