Zhao Rui-yi, Lü Xian-fu, Duan Yi-fan
Huan Jing Ke Xue. 2015 Aug;36(8):2843-8.
To analyze the influencing factors of karstification and karst carbon cycle, a simulation experiment was carried out and 6 soil columns were designed. The results showed that the content of H2O4, hydrodynamic condition and thickness of the soil had important influence on karstification and karst carbon cycle. For the soil columns which were covered by the same thickness of soil, the concentrations of Ca2+ + Mg2+ and SO4(2-) followed the order of B20-2 > B20-1 > B20-3, B50-2 > B50-1 > B50-3. This meant that input of H2SO4 enhanced the karstification and increasing infiltration water had significant dilution effect on the chemical properties. For the soil columns with different thickness of soil but with the same slag pile and hydrodynamic conditions, the concentrations of Ca2+ + Mg2+ and SO4(2-) followed the order of B50-1 > B20-1, B50-2 > B20-2, B50-3 > B20-3. It was demonstrated that more carbonate rock was dissolved under the thick soil columns. In addition, the net consumption of CO2 mainly depended on the content of H2SO4 in this experiment due to slight contribution of H2CO3 to carbonate rock dissolution. More content of H2SO4 brought about less net consumption of C02, but B50-2 was an exception. Organic matter and other nutrients might be input into deep soil with the slag pile, and they promoted the production of soil C)2. Therefore, more CO2 was consumed due to the increased contribution of H2CO to karstification.
为分析岩溶作用和岩溶碳循环的影响因素，开展了模拟实验并设计了6个土柱。结果表明，H₂SO₄含量、水动力条件和土层厚度对岩溶作用和岩溶碳循环有重要影响。对于覆盖相同厚度土层的土柱，Ca²⁺ + Mg²⁺和SO₄²⁻浓度顺序为B20 - 2 > B20 - 1 > B20 - 3，B50 - 2 > B50 - 1 > B50 - 3。这意味着H₂SO₄的输入增强了岩溶作用，增加入渗水量对化学性质有显著稀释作用。对于具有相同渣堆和水动力条件但土层厚度不同的土柱，Ca²⁺ + Mg²⁺和SO₄²⁻浓度顺序为B50 - 1 > B20 - 1，B50 - 2 > B20 - 2，B50 - 3 > B20 - 3。结果表明，厚土层土柱下溶解的碳酸盐岩更多。此外，在本实验中，由于H₂CO₃对碳酸盐岩溶解的贡献较小，CO₂的净消耗主要取决于H₂SO₄的含量。H₂SO₄含量越高，CO₂的净消耗越少，但B50 - 2是个例外。有机质和其他养分可能随渣堆输入到深层土壤中，促进了土壤CO₂的产生。因此，由于H₂CO₃对岩溶作用贡献增加，消耗了更多的CO₂。
