Simulation Of Plant Root And Influence Of Plant Root On Heat And Moisture Migration For REPS System

With the development of the research on heat and mass transfer in porous media, the applied field of the research has being more and more far-ranging. In the field of agriculture, on the demand of "the continuable developing agriculture", human not only pay attention to the total yield, but also to the efficiency of using resource and to the influence that they bring to the environment as little as they can.In REPS system, lucubrate the mechanism and influence of heat and moisture migration. Starting from continuity-media dynamics, using the technique of local-volume averaging, a mathematical model of describing transfer of heat and moisture in soil on a two-dimensional cylinder coordinate is built. On the same time, the models expressing root water up taking, soil surface evaporation and leaf surface transpiration are built to describe the regulation of heat and moisture migration in RPES system fully. In stably numerical simulation, the influence of root-occupation in soil is not considered in the old model. In this paper, the REPS system model is revised, adding root-occupation and physical character in soil, what's more, the compare of the revised model and the old model is given.During the research on the heat and moisture migration in vegetation soil bed, the influence of plant roots modality on the physical fields in soil bed is great. For the uncertainty of plant roots' growing, simulation of plant roots is a difficult. This paper consummates the model of plant roots growing in which the magistral factor is water content in soil bed and soil structure is considered. Based on Fractal Brown Motion (FBM) and the model of plant roots' growing, on the platform of Windows, a computer simulation and analyzing software system was exploited with the technique of fractal theory and computer graphics. On the data of the field experiment, this software controls macroscopically the model of winter wheat roots growing, and reappears winter wheat roots' dynamic growing course. According to the modality of the simulated roots, we estimate the griddings that contain winter wheat roots, and consummate the numerical simulation for physical fields in REPS system.