The size and characterization of biologically active organic carbon pool in soils
To study the size and turnover of the biologically active soilorganic carbon pool, which indicate nutrients supplying capacity and cycling in soil, eleven soils collected from Zhejiang Province were used. The size of the biologically active soil organic carbon pool C0 ranged from 184.87 to 3022.41mg/kg and 2.91%～8.94% of total soil organic carbon. The turnover rate (k) of biologically active soil organic carbon pool was 0.0070～0.0199d-1. C0 has significantly positive correlations with total soil organic carbon , total nitrogen, available nitrogen, CEC, K2Cr2O7 readily oxidized organic carbon, soil microbial biomass carbon, soil microbial biomass nitrogen, water-soluble organic carbon, hot-water extracted organic carbon and light fraction organic carbon,but k has no correlation with all items above (P＜0.05). C0 has no correlation with the percentages of K2Cr2O7 readily oxidized organic carbon, soil microbial biomass carbon, soil microbial biomass nitrogen, hot-water extracted organic carbon and light fraction organic carbon to total soil organic carbon. However, k has significantly positive correlation with the percen tage of water-soluble organic carbon to total soil organic carbon (R2=0.4684 , P＜0.025). The percentage of water-soluble organic carbon to soil total organic carbon was a good indicator to characterize the turnover of biologically active soil organic carbon pool.
biologically active soil organic carbon poolturnover rateindicator
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