中文摘要：

地表壤氡可以反映地下深部的水文、地质、矿产、热源等信息，但土壤氡浓度有年变和日变的特点。为了研究土壤氡浓度日变化规律及其影响因素，采用α能谱测氡仪对土壤氡进行连续测量。结果表明：土壤氡浓度呈单峰型日变化特征，最大值出现在19：00～22：00，最小值出现在11：00～14：00，土壤温度是影响土壤氡浓度的关键因子，土壤氡浓度与土壤温度呈正相关。降雨对土壤氡浓度有显著的影响，降雨后土壤氡浓度出现双峰型日变化特征，其变化与土壤湿度和空气温度等气象因素有关。

英文摘要：

Surface soil radon could reflect deep underground hydrology, geology, mineral resources, heat source and other information, but the soil radon concentration has diurnal and annual variation characteristics. In order to study this problem, the authors used αspectroscopic cumulative radon instrument for continuous measurement. The results show that the law of soil radon concentration diurnal variation is of the single-peak type, the maximum value appears at the time interval of 19：00-22：00, with the minimum value at 11：00-14：00. Soil temperature is the key factor affecting the soil radon concentration, which is positively correlated with soil temperature. Rainfall has significant effects on soil radon concentration, which assumes double peak type after rain. The changes are related to mete-orological factors such as soil humidity and air temperature.