Effects of Ecological Restoration Patterns on Diurnal Variation of CO2 Flux from Rehabilitated Soil of Coal Mining Areas in Huainan City
[Objective] To explore the effects of ecological restoration patterns in coal ming areas of Huainan City,including rehabilitation thickness of soil and reestablished vegetation type on soil CO2 flux,and to provide theoretical basis for ecological restoration patterns similar coal mining region.[Methods] Method of close static chamber-alkali absorption was used to measure the diurnal variation of reconstructing soil CO2 flux.Meanwhile,temperatures of soil surface and 5 cm depth and soil water content were measured and their influences on soil CO2 flux were analyzed in different ecological remediation patterns for coal mining district in Huainan City,Anhui Province.[Results] Diurnal variation of soil CO2 flux exhibited an obvious unimodal pattern during the whole observation period,with peak value at 14:00 and minimum flux at 6:00 for all of the ecological restoration models.The flux ranked at different revegetation districts as:B(brushwood)＞C (brushwood)＞D(arboreal forest)＞A(grassland).Soil CO2 flux of B and C districts were significantly higher than that of A(p＜0.05);no significant differences among others were observed(p＞0.05).Soil CO2 flux with different rehabilitation thickness ranked as:40-80 cm＞0-20 cm＞20-40 cm＞80-100 cm,and their maximum and amplitude also followed this order.Significant relationships were found between soil temperature in 0 and 5 cm depth and soil CO2 flux,which could be described by exponential equation.R2 ranged from 0.34 to 0.70 and from 0.48 to 0.83,respectively.Relationship between soil CO2 flux and soil water content can be described by quadratic equation,with 0.08～0.44 R2 value.[Conclusion] Soil CO2 flux differed under different vegetation types,the highest occurred in brushwood[5.22 μmol/(m2 · s)],followed by arboreal forest[4.56 μmol/(m2 · s)],the lowest was grassland[3.89 μmol/(m2 · s)].Except for 40-80 cm thick ness,soil CO2 flux decreased with the increase of soil rehabilitation thickness.The influence of vegetation on soil CO2 flux was more significant than the one of soil rehabilitation thickness.
soil CO2 fluxrehabilitated soilecological restoration modelsvegetation typesoil rehabilitation thickness
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