有机碳质量分数对森林土壤水分入渗过程的影响及其模拟

为了探讨三峡库区不同森林植物群落土壤有机碳质量分数与土壤水分入渗的关系,将森林土壤有机碳质量分数设定为独立变量,引入土壤有机碳质量分数对Horton土壤水分入渗模型进行修正。结果表明:1)不同森林植被群落类型土壤有机碳质量分数不同,表现为阔叶混交林>针阔混交林>针叶混交林>乔灌混交林;2)初渗速率、初渗速率和稳渗速率的差分别与土壤下层土壤有机碳质量分数呈线性相关关系。研究还发现,Horton模型经引入土壤有机碳指标后,新模型的入渗速率与入渗量模拟值与实测值相关系数明显提高,模拟结果更逼近实测值。研究结果为同类地区森林土壤水分入渗过程预测与模拟提供了一种新方法。

Forest soil water infiltration process influenced by soil organic carbon mass fraction and its model simulation

In order to probe into the process between soil organic carbon mass fraction（SOCMF） and soil water infiltration in different forest plant communities,the forest SOCMF was drown into Horton model as independence variable,which is amended with it.The results showed that the SOCMF was distinct in different forest plant communities.It was the largest in broad leaved mixed forest,and then followed by mixed coniferous and broad leaved forest,coniferous mixed forest,and mixed arbor and shrub forest.Both the initial infiltration rate and the difference between the initial infiltration rate and steady infiltration rate have linear relationship with SOCMF.After Horton model amended,there is a great agreement between simulations and measurements.The study provided a new method to forecast and simulate forest soil water infiltration process in the similar regions.