煤矿塌陷区不同复垦方式对土壤有机碳和黑碳含量的影响研究

摘要

本文以国家级土地复垦示范区徐州市煤矿塌陷区为研究区域,研究复垦土壤中有机碳和黑碳含量的变化,对解释复垦土壤质量变化规律,改善矿区土壤复垦工艺,促进矿区土壤的可持续利用具有一定的意义.本研究采集了煤矸石填充、混推平整复垦、泥浆泵填充和粉煤灰填充4种复垦方式土壤,并以塌陷区土壤作为对照,利用元素分析仪、重铬酸钾滴定法等方法,对其中的有机碳和黑碳的含量进行测定,结果表明:复垦方式对塌陷区土壤有机碳和黑碳的含量具有一定的影响,在粉煤灰填充方式中,土壤中不同深度的有机碳和黑碳含量变化最大;对四种复垦方式不同深度土层黑碳和有机碳含量进行回归分析,均可发现黑碳含量与有机碳的含量达到显著水平.所以研究区黑碳占有机碳的比例与有机碳的累积无明显关系.%In this paper, changes in the amounts of organic carbon and black carbon in reclaimed soil were studied.The subsidence area was in a Xuzhou coal mining area that is part of a national land reclamation demonstration area. The significance of the paper is to explain the law of quality changes of reclaimed soil, improve the soil reclamation process and promote the sustainable use of soil in mining areas. In the study, four kinds of soils were collected using four land reclamation methods: coal gangue filling (CGF), mixed flat reclamation (MFR), mud pump filling (MPF) and fly ash filling (FAF); soil from the subsided area (SS) was used as the control. Organic carbon and black carbon on content were determined by elemental analysis, potassium dichromate titration and other methods.The result shows that reclamation methods do have an influence on the organic carbon and black carbon content in subsidence soil. The content of organic carbon and black carbon at different soil depths varies the most in FAF.Regression analysis of black carbon and organic carbon contents from the four different reclamation methods show that the levels are significant in all cases. Therefore, there is no obvious relationship between the proportion of black carbon and the accumulation of organic carbon in the study area.