叶尔羌灌区冬小麦生育期SPAC水热传输的模拟研究

本文应用土壤水动力学、微气象学和能量平衡原理，建立了作物生育期土壤-植物-大气连续体(SPAC)的水热迁移和转化模型，并采用全隐式有限差分方法进行离散，通过自动调节计算步长和反复迭代等方法设计了数值模拟程序.运用本模型对新疆叶尔羌河流域地下水均衡场1995年3月～6月冬小麦返青至成熟期的田间水热状况进行了模拟.结果证明，该模型较真实地反映了非冻结期作物生长过程中土壤中的水热状况以及地表和作物蒸散发的动态变化过程，可用于墒情预报以及农田蒸散发的研究。

Research on water and heat transfer in SPAC of winter wheat in Yerqiang irrigation area

Based on the theory of soil water dynamics, micrometeorology and energy balance, a model of water and heat transfer in the Soil-Plant-Atmosphere Continuum (SPAC) is established. The numerical simulation is realized by using implicit finite difference discretization and iteration method with an automatically changing time step. Based on the data collected from the Xinjiang Yakand River Ground Water Balance Station the model is tested. The result of evapotranspiration, water and heat condition during winter wheat growing period from greening to mature is analyzed and discussed. It shows that this model can simulate the process of water and heat transfer in the soil and canopy and the water consumption in the field, which is very important for soil moisture prediction and evapotranspiration research in agriculture.