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Effects of Straw and Active Carbon on Soil Carbon in Different Sized Particle under Different N Levels

MA Hong-liang~1,ZHU Jian-guo~2,XIE Zu-bin~2,LIU Gang~2,ZENG Qing~21.Fujian Provincial Key Laboratory of Subtropical Resource and Environment,Institute of Geographical Sciences,Fujian Normal University,Fuzhou 350007,China 2.State Key Laboratory of Soil and Sustainable Agriculture,Institute of Soil Science,Chinese Academy of Sciences,Nanjing 210008,China  
To study the change of soil carbon affected by increase of crops biomass and more carbon input in soil due to elevated CO_2 concentration,a culture experiment on soil from field under Free Air Carbon Dioxide Enrichment(FACE) platform with two CO_2 levels(Ambient CO_2 and Elevated CO_2) and two N levels(Normal N and Low N) was conducted in greenhouse at the same N treatments with field.Results indicated that compared to soil from ambient CO_2 concentration,turnover of different soil particle in soil from Elevated CO_2 concentration was increased significantly and resulted in an increase of soil carbon amount in 53 μm and decrease in 53 μm.The change was larger at Normal N with no straw and at Low N with straw added.Carbon amount in bulk soil was increased and it increased more in treatment with increasing of active carbon into soil from root with straw;it was reverse with no straw treatment.However,the effects of decomposition of straw on carbon in different particle-size were dependent on it at different N levels and this was known poor and need more work to carry out.
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