黄土区土壤CO2释放及其影响因素研究

研究表明黄土区土壤CO2释放具有一定特殊性。从当日清晨至次日晨土壤CO2释放量呈由高至低再变高的规律,其变化趋势大体与温度变化一致,但时间上有一定滞后性。土壤CO2释放量有明显季节变化,夏季日释放量最高,秋季次之,冬季最低。不同覆被土壤CO2释放量存在差异,裸地释放量较高。CO2释放量对土质变化敏感,致密土壤则释放量小。

CO2 emission from soil and its affecting factors in loess area

The research results show that the amount of CO_2 emission from soil tends to keeping pace with the temperature change in Xi'an loess area,however the change of the former is later than that of the latter.The amount changes all the year round,with the highest amount in the summer,then the autumn,and the lowest in the winter.The amount varies under the different conditions of vegetation.Generally speaking,there is a higher amount on the bare ground.The emission of CO_2 is sensitive to the texture and structure of soil.More CO_2 is emitted from loose layers than solid ones.