Paddy soils show significant potential of carbon sequestration. The soil organic carbon (SOC) content of red paddy soils have been reported to be steady after 30 years忆 cultivation and it varies with different fertilization practice. In this study, three red paddy soils, which cultivated under different organic fertilization treatments in a 30 years fertilizer experiment in Changsha, China, was adjusted to the following seven treatments without compromising the original experiment: the original high organic fertilization treatment(HOM) , the high organic fertilization treatment changed from the original normal organic fertilization treatment (N鄄H) , the original normal organic fertilization treatment (NOM) , the normal organic fertilization treatment changed from chemical fertilization (C鄄N) , the chemical fertilization treatment changed from high organic fertilization treatment(H鄄C) , the chemical fertilization treatment changed from normal organic fertilization treatment(N鄄C) , the original chemical fertilization treatment (CF). CO 2 flux of the three original and four
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