质地对土壤热扩散率的影响  

Influence of Soil Texture on the Thermal Diffusivity

作　　者：刘经星[1] 李春桃[1] 梁玉祥[1] 张春来[2] 

机构地区：[1]四川大学化工学院土壤生态修复材料研究中心,四川成都610000 [2]北京师范大学地表过程与资源生态国家重点实验室

出　　处：《中国沙漠》2010年第3期577-581,共5页Journal of Desert Research

基　　金：国家"十一五"科技支撑计划项目(2006BAD2610);科技部国际合作项目(2007DFA90570)资助

摘　　要：土壤热性质的研究是分析地表能量平衡的重要途径之一,土壤热扩散率是表征土壤热性质的重要参数。根据非稳态一维热传导方程的差分解计算了不同质地土壤的热扩散率。结果表明,风干土热扩散率小于1.4×10-3cm2.s-1,并随着时间的推移逐渐减小;土壤质地越轻土墒条件越好热量传输速度越慢。The study of soil thermal property is an important method for analyzing the surface energy balance, and soil thermal diffusivity is a key parameter which characterizes soil thermal property. Thermal diffusivities of soils of different texture were calculated according to different solutions of heat flow equation in non-steady condition. The results indicated that thermal diffusivities of air-dried soils were less than 1.4 × 10^-3 cm^2. s^-1 and decreased with time. Better soil nutrient and lighter soil texture result in poorer heat transfer.

关 键 词：土壤热性质 土壤质地 热扩散率 

分 类 号：S152.8[农业科学—土壤学]