红壤丘陵区土地利用方式变更后土壤有机碳动态变化的模拟

采用双组分模型模拟土地利用方式变更后土壤有机碳储量的变化，并用一些调查和监测数据进行了初步验证．此双组分模型将土壤有机碳分为新形成有机碳和原有有机碳两个组分．每个组分有机碳的形成转化用一级动力学方程描述．本文用此模型对亚热带土壤开垦利用为马尾松林地、湿地松林地、柑桔园和牧草地４种方式１０年来土壤有机碳储量的变化过程进行了模拟，初步结果表明，模拟值与实测值拟合较好．可见，此方法适于用来模拟不同土壤类型下土地利用系统变更初期的土壤有机碳储量动态变化过程．

Simulation of soil organic carbon dynamic after changing landuse pattern in hilly red soil region.

Double component model was used to simulate the soil organic carbon dynamics after changing landuse pattern in hilly red soil region of subtropical China, and investigation and monitoring data were used to evaluate it. The model distinguished soil organic carbon into two compartments, i.e. newly formed organic carbon and native organic carbon. The transformation of each kind of organic carbon was described by the first order kinetics function, and the changing process of soil organic carbon storage in four landuse patterns of masson pine forest, slash pine forest, citrus orchard and pasture since natural subtropical soils being reclaimed for 10 years was simulated. The results show that this method fits to simulate the dynamic process of soil organic carbon storage during the early stage of changing landuse patterns with different soil types.