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采用CI-301PS红外CO2分析仪，测定了退化草地暗沃寒冻雏形土CO2排放速率。研究结果表明：（1）CO2排放速率具有明显的日变化，日最大排放速率在12：00～14：00时出现，最低值出现于凌晨4：00～8：00。白天大于夜晚。（2）植物生长季，CO2释放速率有明显的季节变化和物候变化，日平均释放速率为（320.86±130.49）mg/u001am2·h，CO2释放速率的物候变异为草盛期＞草枯黄期＞草返青期。（3）CO2释放速率的日变化进程主要受气温和地表温度制约，而季节动态与气温及0～30cm地温均呈极显著正相关关系。（4）退化草地上CO2释放速率较低。
Using CI-301PS infrared CO2 analyzer, we measured the CO2 emission rate of Cambodian-Cambodian frozen grass soil in degraded grassland. The results show that: (1) The daily CO2 emission rate has obvious diurnal variation. The maximum daily diurnal discharge rate occurs at 12: 00-14: 00, with the lowest value occurring at 4: 00-8: 00 in the morning. Daytime is bigger than nighttime. (2) During the plant growth season, there were obvious seasonal changes and phenological changes in the rate of CO2 release. The daily average release rate was (320.86 ± 130.49) mg / u001am2 · h. The phenological variation of CO2 release rate was grass flowering> > Grass return green. (3) The diurnal variation of CO2 release rate was mainly controlled by air temperature and surface temperature, while the seasonal dynamics had a significant positive correlation with air temperature and 0 ~ 30cm ground temperature. (4) The rate of CO2 release from degraded grassland is low.