【摘要】 采用现场观测方法,研究了西安黄土塬区土壤碳释放规律。结果表明,不同条件下土壤CO2释放量具有明显的日变化。土壤CO2释放量的变化与温度的变化趋势基本一致,但时间上有一定的滞后,释放量白昼低于夜间。温度是影响土壤CO2释放量变化最重要的因素。CO2释放量对土质变化敏感土质疏松,释放量大;致密的土壤,释放量小。土壤CO2释放量的大小可作为评价土质的一项重要指标。更多还原

【Abstract】 Through using alkali aqua absorption method, the amount of CO2 emission from soil was observed round the clock in Bailu tableland and Shaoling tableland of xi’an, whose topsoil layer was usually composed of Malan loess. The results showed that there existed apparent diurnal courses of CO2 emission amount in soil under different conditions. CO2 emission amount tended to change similarly with the temperature, but had a retardation time. The amount of CO2 emission in the daytime was less than that at night in loess tableland Soil of Xi’an. Temperature was the most important factor affecting CO2 emission. The emission of CO2 in the soil was sensitive to the texture and structure of soil and More CO2 emitted from loose layers than solid ones, which suggested that the amount of CO2 emission could be regarded as an important index of soil evaluation.更多还原