REPS系统中的热物理问题研究

研究资源--环境--作物REPS系统中的热物理问题，发展系统水热资源的最优利用理论，建立作物生长依赖于系统资源的需求和供给模型，探索在复杂气候环境条件下作物根系土壤内的热、湿、气传输规律，发展随资源和环境条件变化的作物生长发育的计算机仿真技术，定量计算作物（如小麦）在全生长期各个阶段的需水量和需热量，以实现农作物的增产增收。

In this study the relations between resource, environment and plant, have been considered roundly, and a mathematical model of the simultaneous transports of the heat, moisture and gases in REPS has also been established. Meanwhile, the daily change of soil temperature has been discussed and a water-extraction model of the root system of an individual fibre plant has been developed. Based on this, the influences of the environmental factors on the transports of heat, moisture and gas in vegetation soil was investigated by numerical simulation. Moreover, a prediction model for soil water content with relatively high accuracy has been presented on the basis of BP neural network and the impacts of soil temperature on the growth of greenhouse plants have also been explored. Furthermore, the retroactions imposed by the global climate change on soil temperature, water, carbon dioxide concentration and the earth system have been analyzed. . In a word, not only the transport rules of REPS have been calculated from the view of heat transfer, but also the entropy change of the whole system has been analyzed from the point of thermodynamics. The achievements obtained in this research have explained a series of thermophysical problems in REPS in theory, and can provide with practical directions for agricultural production, especially the development of the establishment agriculture..