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Soil nutrient evaluation of iron tailings in different vegetation restoration modes based on AHP-PCA |
YAN Sheng, YANG Jianying, SHI Changqing, ZHANG Luyao, ZHAO Tingning |
School of Soil and Water Conservation, Beijing Forestry University, 100083, Beijing, China |
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Abstract [Background] Iron tailings wasteland is one of the most degraded site types caused by the violent disturbance of mining activities. Studies have shown that vegetation restoration can significantly improve soil properties and nutrient content as one of the effective methods for soil reclamation. It is of great significance for soil conservation to evaluate and study soil nutrients of vegetation restoration mode. At present, the sole use of the mainstream evaluation method cannot completely reflect the characteristics of the evaluation object, because the results are affected by the subjectivity of method and the error of the sample difference. This work is to explore the effects of different vegetation restoration modes on soil nutrient recovery in iron tailings wasteland.[Methods] The pH, organic matter, available nitrogen, available phosphorus and available potassium of 6 restoration modes (Castanea mollissima + Juglans regia, C. mollissima + Crataegus pinnatifida, C. mollissima, Pinus tabuliformis + Amygdalus persica, P. tabuliformis + Amorpha fruticosa, A. persica + A. fruticosa) and bare soil were evaluated by evaluation model which combined the weight of analytic hierarchy process (AHP) and principal component analysis (PCA). The above nutrient indexes were obtained by experiment from soil samples of different vegetation modes in the study area.[Results] 1) The trend of soil nutrient recovery in the 6 modes showed that the pH value was improved well, rich in available potassium, medium in available nitrogen, lacking in available phosphorus and organic matter. The nutrient score of the 6 modes was 2.66 -3.40 times higher than the soil of bare land, the highest score of C. mollissima + J. regia mode was 5.61 grade "Credit", in which the soil pH value and organic matter were significantly improved. However, there were significant differences in nutrients between different soil layers in this mode, which indicated the improvement of soil nutrient by vegetation restoration mode was achieved from the surface layer to the deep layer. The evaluation score of A. persica + A. fruticosa mode was 5.40 grade "Credit", which was superior to other modes in the recovery of available phosphorus and potassium.[Conclusions] It is suggested that the mode of C. mollissima + J. regia mixed forest should be adopted to restore the abandoned tailing land. Meanwhile, leguminous deciduous shrubs should be selected to be planted under the forest and phosphorus fertilizer should be applied timely and appropriately to accelerate the recovery of organic matter and available phosphorus. The AHP-PCA evaluation model may reflect the actual situation of the evaluation objects more comprehensively, and the evaluation effect is better than the single method, which has significant practical value for the evaluation of soil nutrients and ecological restoration.
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Received: 04 July 2019
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