Response of Organic Carbon to Temperature Change in Soils under Different Land Use

[Objective]The study aimed to explore the response of organic carbon to temperature change in soils under different land use.[Method] Soil samples(paddy soil and forest soil) collected from Minbei Experiment Station were incubated at 15 ℃ and 25 ℃ for 90 days,and the soil organic carbon was measured.[Result]The results indicated that the relationship between soil organic carbon content and incubation time could be modeled by simple exponential equation,and the fitting coefficient reached the significance level of 0.01.As a general trend,the decomposition rates of organic carbon decreased in the order of paddy soil and forest soil.The decomposition rates of organic carbon increased 1.5 and 1.6 times in forest soil and paddy soil due to 10 ℃ increase.[Conclusion]This study indicated that temperature increase significantly promoted the decomposition of soil organic carbon,but the land use type had no influence on the decomposition of soil organic carbon.