一种土壤剖面标准瞬时CO2通量的获取方法

Soil profile CO2 concerntions was measured continuously by using infrared CO2 analyzer. According to the change of CO2 concerntions with measurement time，a single rectangular model was used to simulate the process. And based on it, a soil profile standard CO2 efflux was put forward. The results showed that the soil CO2 concerntion increased non-uniformly as fast followed by slow during the measurement time (t). Comparing with conventional linear model, the rectangular model had higher correlation coefficient values. Therefore it was confirmed that the rectangular model was more suitable for describing the relationship of CO2 concerntion and the measurement time. The soil profile standard CO2 effluxes obtained by using rectangular model were higher than that obtained by linear model. And these standard values had higher correlation with soil temperatures. Consequently, soil profile standard CO2 effluxes had high reliability and could decrease the underestimate of that based on the linear model.