摘要：The soil respiration is conducive to estimate the response of carbon cycling to future climate change, and thus has received much recent attention. This research presents a case study on how the soil respiration and the temperature sensitivity of soil respiration (Qi〇) change for different crop types in the growing season. The vegetation/crop type changes that occurred in the study area were primarily transformations among calamagrosits angustifolia, broadleaved deciduous forest, maize and rice crop, and the soil respiration rate (Rs), soil temperature and moisture were measured in the crop growing season from April to July 2012. The results showed that the Rs of rice which changed from maize or calamagrosits angustifolia from 1979 to 2012 (M/M/R/R or C/C/R/R) was significantly higher than that of maize which remained as maize (M/M/M/M) and transformed from calamagrosits angustifolia or broadleaved deciduous forest (C/C/M/M or B/B/M/M). The Q10 value of B/B/M/M (1.493) was significantly higher than that of C/C/R/R (1.401), M/M/M/M (1.352), M/M/R/R (1.323) and C/C/M/M (1.232). There was an exponential regression function between the Qi〇 values and soil temperature, and the Qi〇 value was stable (1.4) with no obvious variation when the temperature below 17^ in the growing season. The Qio values showed an increasing trend with soil moistures until reaching the threshold values (36.22% for C/C/R/R, 27.27% for B/B/M/M, 25.68% for C/C/M/M, 24.17% for M/M/M/M, and 34.27% for M/M/R/R) and then declined slightly. These findings can provide information for the studies on carbon emission in agricultural area. However, the value of Qio could cause a lower evaluation due to consider only the observation in the growing season, therefore filed observation of soil respiration should cover all the possible time in the whole year.
