Characterization of Changes in Soil Organic Carbon Fractions of Phyllostachys edulis Interplanted with Sarcandra glabra
[Objective]The changes of soil organic carbon content and carbon pool management index caused by intercropping Sarcandra glabra under Phyllostachys edulis forest were investigated to clarify the disturbance degree of organic carbon stability of bamboo ecosystem by composite management,and provide scientific basis for formulating sustainable management strategy with high comprehensive benefits.[Method]The surface soil(0～20 cm)of intercropping Sarcandra glabra under Phyllostachys edulis was taken as the study object(SG),and the surface soil of adjacent pure Phyllostachys eduliswas set as the control(CK).Soil organic carbon(SOC),easily oxidizable carbon(EOC),microbial biomass carbon(MBC),dissolved organic carbon(DOC),Fe-Al-bound organic carbon(Fe(Al)-SOC)and Ca-bound organic carbon(Ca-SOC)contents were analyzed,the carbon pool management index was quantified.[Result]Compared with pure Phyllostachys edulis forest,intercropping Sarcandra glabra soil organic carbon content increased by 51.3%,and the contents of soil active organic carbon components(EOC,MBC,DOC)and their proportion to soil organic carbon increased significantly,the contents of soil stable organic carbon fractions(Fe(Al)-SOC and Ca-SOC)significantly increased,while their proportions to soil organic carbon significantly decreased.In addition,compared with pure Phyllostachys edulis forest,intercropping Sarcandra glabra soil carbon lability(L)and carbon pool management index(CPMI)significantly increased,while oxidation stability index(Kos)significantly decreased.RDA analysis showed that soil bulk density(BD)was a key environmental factor affecting soil organic carbon and its components.The results of correlation analysis showed that bulk density was significantly negatively correlated with soil organic carbon and its components,and available nitrogen(AN)and available phosphorus(AP)were significantly positively correlated with soil organic carbon and its components[Conclusion]Intercropping Sarcandra glabrasoil under Phyllostachys edulisforest increased the content of soil organic carbon and its components,increased the relative content of active organic carbon components,and decreased the relative content of stable organic carbon components,increased soil carbon pool management index,which was conducive to the regeneration and cycling of soil carbon pool.
organic carbon componentcarbon pool management indexinterplanting under forestsPhyllostachys edulis forestsSarcandra glabra
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