日光温室土壤-植物-环境系统水热耦合运移动态模拟

以温室能量平衡为基础 ,建立了日光温室土壤植物环境连续系统水热耦合运移模型 ,该模型将温室内的水热运移与转化过程概化为土壤根系水热迁移、冠层环境水热迁移和温室内外水热迁移 3个子过程进行研究。采用追赶法和有限差分法求解温室水、热变化过程 ,并与实测资料进行比较 ,结果表明具有较高的精度。将温室土壤植物环境水热系统作为一个整体进行研究的思路 ,对于优化温室水热环境控制 ,促进温室的节能、降耗与作物的优质高产有重要意义。

Dynamic Simulation of Coupled Water and Heat Transfer in Soil-plant-environment Continuum in Solar Greenhouse

A numerical model of simulating coupled water and heat transfer in soil plant environment continuum in greenhouses is developed in this paper. The process of water and heat transfer in the continuum is divided into three sub processes: transfer sub process from soil to root system, transfer sub process from plant canopy to ambient environment, and transfer sub process from inside to outside of greenhouse. The water and heat transfer in soil is described with one dimensional equations, in which interaction between soil water and heat is connected by soil water content. The equations are solved with finite different method, and the model is verified with comparing simulated soil water content and soil temperature with the practically measured values. Results show that the model is reliable and precision.