农田土壤水分实用模式初探

根据土壤水分运动方程建立了旱地农田土壤水分动态数值模拟模式，该模式利用作的发育期和一些参数估算作物根系深度和相对根密度垂直分布动态变化，避免过去对根系进行的困难，增强了模式的应用性能。通过参数敏感性检验和模式应用效果分析表明，该模式可用于干旱、半干旱气候区农田土壤水分预测，为分析作物水分利用和确定农田灌溉量提供科学依据。模式所需的输入为初始土壤含水量、土壤物理常数、作和播种期、逐日平均气温、相地湿

A PRACTICAL SIMULATION MODEL FOR CROPPED SOIL WATER PREDICTION

In this paper,a practical model for dynamic soil water of winter wheat crop was established on the basis of the water movement equation. Both dynamic maximum rooting depth and relative root density profile were estimated in this model from crop's developmental dates including some parameters,which refrains from measuring root density and makes the model easy to apply. Simulation and sensitivity testing showed that this model could meet well the requirements for cropped soil water prediction in arid and semi - arid climate regions. The desired input parameters were soil physical constants, crop' s developmental date,initial soil water content and daily air temperature,relative humidity and precipitation.