The effect of the water excess in soil on soil gaseous carbon dioxide concentrations (c_CO2) was studied based on field experiments. The gradual water addition of 15 and 30 L m⁻² to leptosols and anthrosols, simulating 15 and 30 mm precipitation, respectively, caused the overall c_CO2 increase of 1.53 × 10⁻¹ mol m⁻³ (increase by 60%) and 1.61 × 10⁻¹ mol m⁻³ (increase by 112%) in the soil airs. The effect of the c_CO2 increment on seepage water, cave dripwater chemistry, and calcite speleothem overgrowths was deduced from geochemical modelling. It showed that the c_CO2 increments may lead to the increments in total dissolved carbon, aqueous calcium, and dissolved solids of 1.10 × 10⁻³ mol L⁻¹ (increase by 35%), 4.45 × 10⁻⁴ mol L⁻¹ (increase by 30%), and 1.55 × 10⁻³ mol L⁻¹ (increase by 34%), respectively. After the total degassing of CO₂ in the cave, the increment in the saturation index of dripwater, SI, could reach up to ΔSI = 0.31, which means an increase by hundreds of percent. The water excess of 5 L m⁻² following a dry period would cause the increment in saturation index ΔSI = 0.17. The modelling further showed that the c_CO2 increase associated with the 30 L m⁻² water excess could induce the calcite overgrowth up to 1 μm thick per 1 m² surface area. The effect of water excess with additional water supplies gradually weakens, probably due to reduced CO₂ diffusivity and soil microorganism activity. It can be assumed that the most contrasting peaks in dripwater chemistry are associated with the individual precipitation events after short dry periods. The increased supersaturation of dripwater is expected to lead to faster growth of speleothem and changes in calcite textures.

中文翻译：

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过量水分对土壤二氧化碳，渗流水化学和方解石针oth生长的影响：一种实验和建模方法

在田间试验的基础上，研究了土壤中过量水分对土壤气态二氧化碳浓度（c _CO2）的影响。分别模拟15和30 mm的降水，分别向15和30 L m ^-2的水中添加15和30 L m ^-2导致总的c _CO2增加1.53×10 ^-1  mol m ^-3（增加60％）和1.61 ×10 ^-1  mol m ^-3（增加112％）。从地球化学模型推导了c _CO2增量对渗水，溶洞滴水化学和方解石针状藻过度生长的影响。结果表明，_二氧化碳增量可能导致总溶解碳，钙水溶液和溶解固体的增量分别为1.10×10 ^-3  mol L ^-1（增加35％），4.45×10 ^-4  mol L ^-1（增加30％），和1.55×10 ^-3  mol L ^-1（增加34％）。在洞穴中的CO ₂完全除气后，滴水的饱和指数SI的增量可能达到ΔSI= 0.31，这意味着增加了数百％。干燥期之后过量的5 L m ^-2的水将导致饱和指数ΔSI= 0.17的增加。该模型进一步表明，与30 L m相关的c _CO2增加^-2过量的水可能导致方解石过度生长，每1 m ²表面积厚达1μm 。过量供水和额外供水的影响逐渐减弱，这可能是由于降低了CO ₂扩散性和土壤微生物活性。可以假定，滴水化学中最鲜明的峰值与短暂的干燥期后的各个降水事件有关。滴水过饱和度的增加有望导致蛇麻草的更快生长和方解石质地的变化。