| Vegetation restoration is an effective method to the ecological restoration of coal mine.It will be not only conducive to improve ecological environment and restore ecosystem diversity.And it will be helpful to guide the future vegetation restoration work of other conveyor field.In this article,we chose the soil which restoration in eight years as the research object for ecological benefit evaluation.The influence of the soil physical and chemical properties of six vegetation restorations was discussed.The main conclusions show that:(1)Vegetation restoration played a key role on soil pH value’s improvement.The bare soil of the conveyor field was acidic and it would not suitable for plant growth.And after vegetation restoration,the soil pH value had varying degrees improvement.Among the six models,the improvement of Robonia pseudoacacia-Hippophae rhamnoides-Medicago sativa model,Pinus tabuliformis-Platycladus orientalis model and Lespedeza bicolor-Caragana korshinskii model was best and the soil was neutral after restoration.(2)The effect of the soil nutrient value of vegetation restoration was obvious.When the soil depth was within 0 to 20centimeters,the accumulation of the Robonia pseudoacacia-Hippophae rhamnoides-Medicago sativa model was the most significant.The content of organic matter of it was 2.29 times to the control.The content of available N was 2.91 times.The content of available P was 4.42 times.And the content of available K was 1.71 times.At the same time,the improvement of the model of Robonia pseudoacacia and Pinus tabuliformis-Platycladus orientalis was the second.So,the best improvement vegetation restoration models were Robonia pseudoacacia-Hippophae rhamnoides-Medicago sativa,Robonia pseudoacacia and Pinus tabuliformis-Platycladus orientalis.The mixed models were better than the single model.The effect of the top soil was better than the deep. |
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