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.
Journal of Agro-Environment Science( J. Agro-Environ. Sci.)
short- time incubation
soil drying and rewetting
flush of carbon dioxide