摘要
引入土壤表面阻力概念来说明土壤水分蒸发过程, 提出了实验室测定其大小的整套试验方法。在此基础上, 对土壤表面阻力与蒸发、影响蒸发的主要因子的关系进行了分析研究。结果表明, 土壤表面阻力总趋势是随蒸发时间的延长和累积蒸发量的增加而增大, 但这种关系有可能被土壤蒸发面和大气间水汽压差的改变所打破,土壤蒸发面和大气间水汽压差是决定土壤表面阻力的主要因素之一。同时,还对土壤表面阻力与蒸发时间的关系、与蒸发时间及土壤蒸发面和大气间水汽压差的关系进行了模拟, 结果后一种比前一种模拟更符合实际。
This paper introduced a concept of soil surface resistance to explain the process of soil water evaporation and put forward a method for determination of soil surface resistance in lab. On the basis of the above, the author studied and analyzed the relations between soil surface resistance and evaporation and main factors that influence the evaporation. The results showed that soil surface resistance often increased with evaporation time and cumulative evaporation, but the relation might be changed by variation of difference of vapour pressure between evaporating plane and atmosphere; difference of vapour pressure between evaporating plane and atmosphere was one of the major factors for determining the soil surface resistance. The relations between soil surface resistance and evaporating time,and difference of vapour pressure between evaporating plane and atmosphere were simulated.Simulating result of the latter was better than that of the former.
出处
《西南农业学报》
CSCD
北大核心
1999年第S1期56-62,共7页
Southwest China Journal of Agricultural Sciences
关键词
风干表土
土壤表面阻力
蒸发面
蒸发速度
水汽压差
air dry surface soil
soil surface resistance
evaporating plane
evaporation rate
difference of vapour pressure
