Research On Rice Roots Distribution And Water Uptake Model In Water-saving Irrigation Conditions

Rice roots stratified by fractal dimension was established based on the fractal dimension of the spatial distribution of rice roots model. By measuring the rice root length density, density or weight-effective root length density and root fractal dimension, studied under the conditions of water stress distribution of rice root, root growth inspected the water and the quantitative relationship between. Root through fractal dimension and effective root length density of the regression analysis based on the fractal dimension of effective root length density model. And using crop growth under the soil water dynamics of the macro model, based on the measured changes in soil suction, Dynamic simulation of rice roots of the water rate changes in time and space, a rice jointing booting root uptake model. The results are as follows :1. Rice roots overall fractal dimension mainly between 1.207 and 1.542 changes roots, Layered Fractal Dimension in between 1.002 and 1.775 changes, root fractal dimension is the vertical gradually decreased. Moisture stress on the upper branches extend roots greater impact, mild water stress on the middle branch Root little impact moderate water stress on the middle branch root greater impact on water stress on the lower Root little impact.2. In the treatment of the root length density in the vertical decreased, Soil upper root length density is far lower than root root length density, the water treatment root length density has increased with time growing. Moisture stress on the tiller period, jointing wheat root length density effects than similar Overall moisture stress on the upper and lower root length density less impact on middle-root length density greater impact. Rehydration after water stress late in the larger effect.3. Rice effective root length density of a few errors and rice root layered fractal dimension D were significantly correlated through regression analysis based on the fractal dimension of the effective root length density function.4. Rice root fresh weight, dry weight of the total vertical trend, as the depth increases with decreasing, Root mainly from the soil surface in 0 - 30cm depth, 30cm below has declined markedly. Moisture stress on the root fresh weight and dry weight greater impact on the water capacity of root growth after a certain recovery.5. Rice through transpiration and evaporation experiment simulation model to examine soil water movement, Rice established jointing booting the water treatment under the absorbent roots model using the measured data to the model test results show that high precision simulation models, a certain value.