不同气体培养条件下玉米秸秆分解对土壤有机碳的影响

he transformation of organic matter in steppe soils and the relation to incubation condition（H2O、CO2 and O2）under different incubation condition were studied. The objects are to provide scientific basis for clarifying the theoretical essence of improving soil fertility by organic material and regulating soil fertility. Moreover, they are also give new data for research on soil organic matter and humic substance chemistry. The results were as follow: The amount of organic carbon (OC) increased in soils after the addition of corn stalk. They gradually decreased with prolonged incubation time, but still higher than CK at the end of incubation experiments (180th day). The amounts of OC were different under different incubation conditions. At the end of incubation experiments, the amount of OC was lowest (21.05g/kg) under high water content and normal atmosphere, but was highest (23.74g/kg) under low water content, high CO2 and low O2.