土壤与沉积物中天然有机物释放过程的动力学研究

Release kinetics of organic carbon from soil and sediment

根据不同流速条件下解吸及降解过程的模拟实验结果，探讨土壤与沉积物中天然有机物释放的动力学过程．研究发现，有机物的释放包括解吸与降解两个过程．影响二者时间尺度有所不同，均遵循一级动力学反应规律．流速对平衡浓度与速率常数均有影响，速率常数随流动相线速度的升高而加大．湿度与温度是降解过程的主要影响因素，湿润条件与高温有利于有机物降解．

The kinetics of desorption and degradation processes of soil organic carbon from soil and sediment were simulated and modeled.The release of soil organic carbon can be divided into two processes (desorption and degradation)which follow typical first order kinetics with different time scales.The rate constants and equilibrium contents of soil organic carbon desorption are affected by flow rate.Soil moisture and temperature are two major factors influencing the degradation of insoluble organic carbon.Moist condition and high temperature can accelerate the degradation process.