Responses of CO2 emissions and labile organic carbon to earthworm activities in Phyllostachys edulis forest soil
[Objective]The objective is to understand the effects of earthworm activity on soil CO2 emission and labile organic carbon change in Phyllostachys edulis forest,which is crucial to comprehending the role that soil fauna plays in the carbon cycle of P.edulis forest.[Method]Three treatments including ck(control,P.edulis),MBL(P.edulis with litter)and MBLE(P.edulis with litter and earthworms)were employed to conduct a three-month greenhouse pot experiment.Static chamber-gas chromatograph was used to collect and analyze CO2 release from soil in different times.The contents of soil organic carbon(SOC),particulate organic carbon(POC),dissolved organic carbon(DOC),mineral-associated organic carbon(MAOC)and microbial biomass carbon(MBC)were measured.[Result]The activity of earthworms significantly increased the biomass of P.edulis by 20.3％(P＜0.01),and the response of soil CO2 emission to earthworm activity was sensitive to changes over time.There was no significant difference in CO2 emissions between MBLE treatment and MBL treatment in the early stage of the experiment(＜51 d).However,in the later stage of the experiment(＞51 d),the cumulative CO2 emission under MBLE treatment was significantly higher than that under MBL treatment(P＜0.05).On the 85th day,the cumulative CO2 emission under MBLE treatment increased only by 4.5％compared with MBL treatment.The soil CO2 emission flux under MBL treatment increased by 25.2％compared with MBLE treatment.The impact of earthworm activity on soil carbon mass fraction was also varies over time.The contents of SOC,DOC,POC and MAOC under MBLE treatment were lower than those under MBL treatment in the first 68 days,while the MBLE treatment significantly increased DOC content by 15.2％on the 85th day(P＜0.05).SOC content,MAOC content,and POC content increased by 8.5％,8.5％,and 10.6％,respectively.MBC content significantly reduced 26.3％at the end of the experiment(P＜0.01).[Conclusion]Earthworm activity can promote the growth of P.edulis,increase soil carbon content,and reduce soil CO2 emission flux and cumulative emissions at the end of the experiment.[Ch,3 fig.2 tab.47 ref.]
earthworm activitylabile organic carbonPhyllostachys edulissoil CO2 emission
万方数据
维普
