摘要
运用碱液吸收法,对西安长延堡土壤CO2释放量在不同天气状况下进行了多次昼夜观测,查明了土壤CO2释放量的变化规律及其影响因素,揭示出土壤CO2释放量与温度、降水以及植被的密切关系。研究表明:温度升高,土壤CO2释放量增大;由于集中降水导致土壤通气性变差、温度明显降低,使得CO2释放量比晴天有所减少;在不同的植被条件下,土壤CO2释放量存在差异,从裸地到草地再到林地,CO2释放量由小变大。
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<grassland<forestry land.
出处
《干旱区地理》
CSCD
北大核心
2005年第3期316-319,共4页
Arid Land Geography
基金
国际地质对比计划项目(IGCP448)
中国科学院黄土与第四纪地质国家重点实验室项目(LLQG0306)
关键词
西安长延堡
土壤CO2释放量
影响因素
Xi’an area
amount of CO2 released from soil
influence factors
