In this paper,NaOH solution is used for absorption of CO2 released from soil in Xi’an area round the clock on the condition
of different weather,the material indicates that the change law and
influence factors of the
amount of CO2 released from soil is close relation to temperature,precipitation and vegetation.With the temperature rising,more and more CO2 is released from soil.The amount of CO2 released from soil changes from low to high and then to low from morning to the next morning.By comparing the curves of air temperature change with the curves of the amount of CO2 released from soil,it is known that the time stage of much amount of CO2 released from soil is corresponding to that of low temperature,and the time stage of less amount of CO2 released from soil is corresponding to that of high temperature.The reason why the phenomenon occurs is that the change of soil temperature is about 3~6 hours later than the change of the air temperature.The precipitation adds to soil moisture content,and makes soil aeration become weak; at one time,precipitation lead to temperature reduce obviously,which makes the amount of CO2 released from soil in rain day less than that of in sunny day.Under the different vegetation condition,the amount of CO2 released from soil is of difference.It can be ranged in a reducing sequence as bare land
Published: September 05, 2005
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