【摘要】 对北京农学院一座日光温室的地温进行测试和分析,建立了非稳态地温场的数学模型,用差分法计算出土壤的热扩散率,选用SAS软件进行非线性回归,回归模型较好的反应了土壤温度场分布状况,为进一步研究日光温室地温场特性提供了手段和依据。更多还原

【Abstract】 Measurement and analysis were conducted on soil temperature of a greenhouse, located in Beijing Agriculture College. The paper presents a mathematical model of unsteady heat transfer of soil temperature, calculates the heat diffuse coefficient of soil by difference method, and fits equation on experimental data by SAS. The model shows good agreement between the calculate values and measured data, affords means and evidence for further analyzing of the heat property on soil in greenhouse.更多还原