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Effects of CO_2 Concentration Increase in the Atmosphere on Carbon in Different Sized Soil Particles

MA Hong-liang~ 1,2,ZHU Jian-guo~1,XIE Zu-bin~1,LIU Gang~1,ZENG Qing~1(1.State Key Laboratory of Soil and Sustainable Agriculture,Institute of Soil Science,Chinese Academy of Sciences,Nanjing 210008,China;2.Fujian Provincial Key Laboratory of Subtropical Resources and Envrionment,Fuzhou 350007,China)  
The carbon in different sized soil particles has different means of turnover.Under the condition of high atmospheric CO_2 concentration,the change of carbon content in different sized soil particles partly reflects whether the total carbon accumulation in the soil is increasing or not.Basing on field cultivation experiment and under high CO_2 concentration condition,the distribution of carbon content in different sized soil particles was primarily studied.The experiment indicated:after one year of cultivation with the input of straw into the soil,owing to the increase of CO_2 concentration,the carbon contents increased by 0.01 g/kg,1.10 g/kg and 1.22 g/kg respectively for the low nitrogen soil,the normal nitrogen soil and the high nitrogen soil.To be more detailed,for 53 μm sized soil particle,the increasing weights of carbon in the soil are 1.53 g、2.19 g and 2.70 g respectively,and the increasing rate of carbon concentration is 5.4%, mainly due to the 36.2% increase of the weight distribution percentage.For250 μm sized and 250~53 μm sized soil particles,although the carbon concentrations increased respectively by 20.8% and 17.3%(P0.05),the carbon weights both decreased because the weight distribution percentage went down respectively by 22.8% and 36.1%.This research clearly demonstrated that the distribution and concentration of carbon in different sized soil particles both changed obviously under high atmospheric CO_2 concentration condition,particularly a prominent increase in carbon content was detected for53 μm sized soil particle with high nitrogen fertilization level.
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