中文摘要：

利用EGM-4便携式环境气体检测仪,在野外现场及室内开展沙柱试验,检测土壤不同深度的CO_2浓度。结果表明：土壤中CO_2浓度具有明显的差异性,具有随着植被发育程度增高而升高的趋势。（1）土壤中CO_2浓度比当地大气及地表CO_2浓度显著偏高;（2）野外现场测试得到,随深度增加,土壤温度及CO_2浓度逐渐升高,于深度210cm处土壤CO_2浓度似存在极大值;（3）不同坡度时,坡度较小者的土壤CO_2浓度偏高;相同坡度时,植被条件好的土壤CO_2浓度偏高;（4）在单棵树株周围,具有随着与树干距离增加,同样深度土壤CO_2浓度逐渐减小的趋势。文章讨论了土壤（包气带）CO_2浓度变化与水的溶滤能力及地下水化学性质之间的关系等水文地质意义。

英文摘要：

Using EGM-4 portable gas detector to detecte the CO2 concentration and temperature in soil at countryside and Lab.The results showed： The concentration of CO2 in the soil increases with the development of vegetation.（1） The concentration of CO2 in the soil was greater than that in the atmosphere or ground surface.（2） The CO2 concentration of soil at different depth has significant changes that it gradually increases with the increase of the depth but it may be the max at depth of 210cm.（3） The soil CO2 concentration increases with the increasing of vegetation development degree or the decreasing of land slope.（4） The soil CO2 concentration decreases with the distance from the tree trunk.At the end the certain relationship between the change of groundwater and the aeration zone of CO2 is discussed.