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| DOI：10.13522/j.cnki.ggps.2019115 |
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| The Effects of Coal-derived Compound Fertilizers on Soil Carbon and Its Formations in Reclaimed Soil in Coal Mining Areas |
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FAN Xiaodong, LIU Bing, MENG Huisheng, HONG Jianping, ZHANG Jie
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1. College of Resources and Environment, Shanxi Agricultural University, Taigu 030801, China; 2. Taiyuan Landscape Construction Quality Supervision Station Shanxi Academy of Forestry Sciences, Taiyuan 030012, China
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| Abstract: |
| 【Background】Economic booming in China over the last two decades has escalated its demand for mineral resources and the exploitation and mining of coal has generated a huge amount of industrial and mining wastes such as weathered coal, coal slime and fly ashes. Accrual of these wastes not only took lands and contaminated environment, it also destructed soil structure and deteriorated soil quality. Compared to long-term cultivated soil, soil in coal mining areas is characterized by poor structure, low fertility and lack of microorganisms. Therefore, turning these wastes to useful soil amendment is important in developing sustainable economy.【Objective】The purpose of this paper is to investigate the efficacy of using compound fertilizers derived from these wastes to restore soil quality in coal mining areas. We compared the efficacy of two such compound fertilizers used with different fertilizations to improve total soil organic carbon and carbon formation in a reclaimed coal mining soil.【Method】Field experiment was conducted in a coal mining-induced subsided area which has been under reclamation for four years at Xiangyuan County, Changzhi City in Shanxi province. Coal-derived compound fertilizer I and II were used with four nitrogen fertilizations: 90 kg/hm2, 135 kg/hm2, 180 kg/hm2 and 225 kg/hm2 to study their combined effects on total soil organic carbon and carbon formation (carbon pools).【Result】With the application of either of the two compound fertilizers increasing, the content of total organic carbon and active organic carbon in the reclaimed soil increased significantly; the content of moderately active carbon was higher than the content of highly active fraction. The compound fertilizer II was more effective than compound fertilizer II in boosting soil carbon increase (P<0.05). Compared with the control without compound fertilization, amending the soil with Compound fertilizer II increased total soil organic carbon, water-soluble organic carbon, microbial carbon and total active organic carbon by 13.94%~40.84%, 76.44%~266.12%, 77.98%~185.37% and 31.45%~97.53% respectively, while compared with fertilization with conventional compound fertilizer, the associated increase was 2.1%~22.96%, 73.27%~101.22%, 17.54%~88.46% and 30.65%~45.19% respectively. Compound fertilizer II coupled with 135kg/hm2 of nitrogen fertilization was most effective to improve soil carbon pool, increasing by 306.12% and 125.31% compared to that without nitrogen fertilization and that with conventional compound fertilization respectively.【Conclusion】 Amending soil with the two coal-derived compound fertilizers both increased soil organic carbon, and the most effective fertilization was coupling the compound fertilizer II with a nitrogen application of 135 kg/hm2. The results presented in this paper have wide application for using coal-derived compound fertilizers to reclaim soils affected by coal mining. |
| Key words: Coal-derived compound fertilizer; soil reclamation; total soil organic carbon; labile organic carbon; carbon pool management index |
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