摘要
应用短期培养实验研究了干燥和重新湿润引起的土壤CO2激发释放及其动力学过程。结果表明,不经干燥和重新湿润处理土壤CO2释放速率基本不随时间变化,其CO2释放过程可以用零级反应动力学方程(Y=k0t)描述;干燥和重新湿润处理过程能够引起明显的土壤CO2激发释放,这是干燥和重新湿润引起的土壤呼吸激发效应(一级反应)和土壤基本呼吸(零级反应)相互叠加的结果,可以用两库叠加模型Y=at+A0(1-e-kt)很好描述。本实验条件下扰动、干燥和重新湿润引起的土CO2净激发释放量为23.05～59.90mgCO2-C·kg-1,主要与不同培肥措施长期实施造成的土壤性质和肥力差异,特别是有机质数量和质量的差异有密切关系。
Flush of CO2 and its kinetic courses of drying and rewetting soils were studied in short- time incubation. The results showed that CO2 emission rate in no dried and rewetted soils was not changed with time, and its emission courses could be described by zero- order kinetic equation( Y=k0t) . For the drying and rewetting soils, the CO2 emission showed the typical initial CO2 flush, which can be explained by the additive effects of soil respiration prime effect (first- order) caused by drying and rewetting and the basic soil respiration (zero- order). The flush of CO2 following drying and rewetting soils could be well described by the two- pool modelY=at+ A0(1- e- kt). In shorter- time incubation, the net CO2 flush in different Lou soils caused by disturbance, drying and rewetting varied from 23.05 mg CO2- C· kg- 1 to 59.90 mg CO2- C· kg- 1, and it was correlated tightly with the differences of soil property and fertility, especially the differences of soil organic matter quality and quantity, caused by long- term different fertilization methods.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2004年第2期318-322,共5页
Journal of Agro-Environment Science
基金
中国科学院知识创新工程重大项目--中国陆地和近海生态系统碳收支研究(KZCX1-SW-01)
关键词
干燥
湿润过程
土壤
C02激发释放
模拟研究
动力学
short- time incubation
soil drying and rewetting
flush of carbon dioxide
kinetics
