为了揭示气温变化对土壤冻结与融化速率的影响及土壤冻融特征与气温之间的关系,进行了8个连续的冻融期气温和土壤冻融过程监测.结果表明:当气温急速持续下降至0 ℃以下且日平均气温为负值时,表层土壤无昼融夜冻特征,直接进入冻层稳定发展阶段.冻结期土壤最大冻结深度、土壤平均冻结速率均与稳定的日平均负气温具有密切的线性相关.消融期土壤双向融化,平均消融速率较冻结期冻结速率高35%~132%,土壤平均消融速率与消融期日内最高气温具有线性关系.研究结果对于季节性冻土地区农业生产和工程建设具有一定的指导意义.%In order to reveal the influence of temperature on soil freezing and thawing rate, and the relationship between soil freezing-thawing characteristics and air temperature,the air temperature and soil freeze-thaw process was monitored during eight consecutive freeze-thaw peri-ods at Taigu Water Balance Experimental Field,Bureau of Hydrology and Water Resources Sur-vey of Shanxi Province.The results show that:when the temperature drops rapidly to below 0 ℃and the daily average temperature is negative,the surface soil has no characteristic of daytime thawing and night freezing,and directly enters the stable freezing stage.The maximum soil freezing depth and average soil freezing rate (AFR)in stable freezing period have a close linear correlation with daily average negative temperature.The average soil thawing rate(ATR)in tha-wing period is about 35%~132% higher than AFR,and ATR has a linear relationship with the daily maximum temperature.The research results are significant for agricultural production and engineering construction in seasonal frozen soil area.
展开▼
