As an essential indicator of soil quality,soil labile organic carbon(SLOC)and its fractions play an important role in many soil chemical,physical and biological properties.Here,a field experiment was conducted to determine the seasonal dynamics and content of soil labile organic carbon in subtropical evergreen broadleaved forest.The results as follows:(1)The soil nutrients and available nutrients had a similar change trend with the order of summer>autumn>spring>winter,while the soil total phosphorus had no significant difference in different seasons(P>0.05).(2)Easily oxidized organic carbon(EOC),particulate organic carbon(POC),light organic carbon(LFOC)and water-soluble organic carbon(WSOC)had the obvious seasonal dynamics,which showed summer>autumn>spring> winter.(3)Soil microbial biomass carbon(SMBC)and soil microbial biomass nitrogen(SMBN)also had the obvious seasonal dynamics,which showed summer>autumn>spring>winter,and SMBC and SMBN in summer and autumn were significantly higher than that of spring and winter(P<0.05),while SMBC/SMBN had no significant difference in different seasons(P>0.05).(4)There was a significant linear relationship between SOC and SLOC,indicating that soil active organic carbon depended on soil total organic carbon content.And(5)there was a significant relationship among EOC,POC,LFOC,WSOC,SMBC and soil organic carbon(SOC),total nitrogen(TN),while no significant relationship with total phosphorus(TP),which suggested that the components of soil labile organic carbon were closely related,and SOC and TN was the mainly driving factors to soil labile organic carbon in subtropical evergreen broadleaved forest.
Ecology and Environmnet
subtropical evergreen broadleaved forest
soil labile organic carbon