Carbon Effects On The Soil Carbon And Vegetation Carbon Pools By Mining Disturbance In Mining Area With Higher Groundwater Level

Routine carbon footprint in coal mining such as energy and power consumptioncould be easily evaluated, but carbon effects on the soil carbon, vegetation carbonand ithosphere carbon pools by mining disturbance are far away from accurate andreliable assessment by now. In the dissertation, taking Jiuli Mining Area (a higherground-water mining area) as a study case, sciences of coal mining, miningsubsidence, ecology, biogeochemistry, agrology and agronomy, integrated methodssuch as GIS and experiments, and analysis approaches of simulation, comparisonand verification are applied to evaluate the carbon effects on the soil carbon pool andvegetation carbon pool disturbed by coal mining.Firstly, after analyzing the conception and connotation of the carbon pool andthe terrestrial ecology carbon pool, the definition of the carbon effects on the soilcarbon pool and vegetation carbon pool disturbed by coal mining is given. Carboneffects on the soil and vegetation carbon pool means the carbon increase effect(carbon sink) or carbon loss (carbon source) effect in soil carbon and vegetationcarbon pools before and after mining in subsidence area. And then, based on thebiogeochemistry, the mining subsidence, ecology, ecology agronomy, and otherrelated academic knowledges are applied to qualitatively analyze the carbon effecton the soil carbon pool and vegetation carbon pool.Secondly, a typical mining subsidence basin is selected within the research areato sample data about vegetation and soil properties. Combined with the MiningSbsidence Model and Universal Soil Loss Equation (USLE), the changes of the NPPand soil organic carbon loss during ground depression-stabilization by mining in thesubsidence slope, and the changes of soil carbon pool storage and vegetation carbonpool storage of the subsidence slope befor or after the mining are evaluated andanalyzed, which indicated that during ground depression-stabilization by coalmining, there is a huge soil organic carbon loss and the loss in active subsidencephase is greater than that in inactive subsidence phase. in upper slope of thesubsidence area, and NPP is near0t/km2in the slope of the basin because thesubsidence basin is no longer cultivated, and a significant changes of the carbon poolstorage and vegetation carbon pool storage happens befor and after mining.Thirdly, based on test data of physicochemical soil properties and NPP which is acquired through the outside sampling in the subsidece slope, the changecharacteristics of the physicochemical soil properties and NPP with the sinking depthin the slope are studied. Ulteriorly, influencing factors of soil organic carbon contentand NPP in mining subsidence area are analyzed statistically, which indicated thatsoil bulk density, saturated hydraulic conductivity, clay content is significantlyrelated to soil organic carbon content, and soil bulk density, saturated hydraulicconductivity is significantly correlated to NPP in the subsidence area; subsidenceterrain slope is significantly negatively correlated to soil organic carbon content,butno significant correlation with NPP; sinking logged water in the subsidence area is asignificant factor of the soil organic carbon content and NPP.Lastly, an evaluation model of the carbon effects on the soil and vegetationcarbon pools by coal mining is established. The model includs the overall frameworkand the specific composition: assumptions, input variables, the sampling points laid,carbon storage estimation of soil and vegetation carbon pool in the subsidence area,determination of the carbon effect, etc. Then, carbon effects on the soil andvegetation carbon pools by coal mining in subsidence area of Jiuli Mining Area arecalculated, and the results indicate that carbon effect on the soil carbon pool iscarbon loss (carbon source), and carbon effect on the vegetation carbon pool is alsocarbon loss(carbon source).