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在土壤碳酸钙淋溶淀积过程的建模中,需要根据土壤碳酸钙化学热力学平衡原理求解土壤溶液中的Ca2+浓度和pH值,其中有些参数难以获得（如有关离子的活度系数）,不能直接求解,导致无法实现其过程的计算机模拟。本文针对这一难题,提出了一种逐步逼近算法,在已知土壤空气中的二氧化碳分压和土壤温度的情况下,可求得干旱地区土壤溶液中的Ca2+浓度和pH值,为土壤碳酸钙淋溶淀积过程的计算机模拟提供了重要的技术支持。本算法理论依据充分、结果稳定精度高、程序简便易实现,并在CAEDP模型中已得到了应用和验证。
In the modeling of soil calcium carbonate leaching and deposition process, the Ca2 + concentration and pH value in soil solution need to be solved according to the chemical calcium thermodynamic equilibrium principle of soil calcium carbonate. Some of these parameters are difficult to obtain (for example, the activity coefficient of ions) Solving directly leads to a computer simulation that fails to achieve its process. Aiming at this problem, a gradual approximation algorithm is proposed in this paper. Under the condition of knowing the partial pressure of CO2 and the soil temperature in the soil air, the Ca2 + concentration and the pH value in the soil solution in the arid area can be obtained. Computer simulation of the leaching deposition process provides important technical support. The theory of this algorithm is sufficient, the result is stable and precise, and the program is simple and easy to implement. It has been applied and verified in CAEDP model.