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Based on the data of soil organic carbon content and soil water infiltration rates on four kinds of forest land, features of the organic carbon content distribution and the infiltration process of water in the soil were analyzed. It is found that, from large to small, the sorting of the four kinds of forest land on average soil organic carbon content are respectively: broad leaved mixed forest, mixed coniferous and broad leaved forest, coniferous mixed forest, and mixed arbor and shrub forest. The organic carbon has an uneven distribution in soil vertical direction. The content in surface soil is comparatively high, and with the increase of depth the content decreases gradually. And it is shown that water infiltration rate has close relation with the soil organic carbon which can be expressed as the following formula: . Compared with the Horton soil water infiltration model simulation, the relative coefficients of the soil water infiltration rate simulation value and the practical measured value rise from 0.950, 0.951, 0.933, 0.921 to 0.968, 0.972, 0.961, 0.970. And the relative coefficients of the infiltration content simulation value and the practical measured value of a certain time period rise from 0.905, 0.628, 0.756, 0.898 to 0.941, 0.827, 0.905, 0.940. This model is much closer to the practical measured value and provides the estimation and simulation of the soil water infiltration process with a correct and effective approach.       Key words: Soil organic carbon, soil water infiltration, infiltration rate, soil water infiltration model.

Impact and simulation of soil organic carbon on soil water infiltration process