The Method Research Of Infiltration Parameter Established By Routine Soil Physical Parameters

Soil water infiltration is aimportant link in nature water cycle, Study on soil water infiltration may make sure reasonably farmland irrigation technical parameter to offer science reference. In this paper, based on the soil water infiltration multifactorial influence tests with three species of soil texture and different husbandry condition and monofactorial influence tests with four species of soil texture in indoor, the basic infiltration characteristics ,reduction infiltration mechanism and various factors are studied systematically .major factors influencing soil infiltration characteristics, resilience between influence factors and soil water infiltration parameter and influence priority are analyzed by mathematics statistics method, stepwise regression models with multiple units of soil water infiltration parameters are build up and verified.Soil water infiltration capacities and parameters of soil water infiltration model make severe change in agriculture productive period, but have definite change law as well. The changing procedure of soil water infiltration capacities is in keeping with second-degree polynomial change functions in cornfield, sesame field and fallow field and with quartic-degree polynomial change functions in wheat field in unfrozen phase, The changing process of soil water infiltration capacities suit second-degree polynomial change functions in various husbandry condition in frozen phase.Factors which influence field soil water infiltration characteristics have soil structure, soil moisture, soil texture, topsoil crusting and plate, agriculture husbandry measure and soil water phase change and so on. Because these factors make change more often, soil time space variability is more bigger. The relationship of single factor between soil water infiltration capacities and certain influencing factor could be established quantitatively by means of soil water infiltration tests in indoor, there is negative correlation relation between soil water infiltration capacities and soil structure. There is negative correlation relation in high grit content and low physical clay content soil, and second-degree polynomial relation in high physical clay content junk structural soil between soil water infiltration capacities and soil moisture.It is feasible to predict soil infiltration capacities by routine physical parameters with stepwise regression models with multiple units. The rate of contribution of various edaphic physical parameters is different from parameter of soil water infiltration model in different soil texture and husbandry condition, so independent variable factor and priority are different in regression models. The predicted results are satisfactory in correlation husbandry condition.