Effects of Phyllostachys edulis expansion on soil microbial residue carbon accumulation in evergreen broad-leaved forests
[Objective]This study is to reveal the dynamic changes of soil organic carbon(SOC)in evergreen broad-leaved forests during the expansion of Phyllostachys edulis in subtropical regions by affecting the accumulation of soil microbial residue carbon.[Method]Taking amino sugar as the research object,this study investigated the accumulative effect of microbial residue carbon in surface soil(0-10 cm)of evergreen broad-leaved forest,Ph.edulis and broad-leaved mixed forest,and pure Ph.edulis forest in the state-owned forest farm of Lingfengsi in Anji,Zhejiang Province,as well as the correlation characteristics with organic carbon.[Result]During the expansion of Ph.edulis,soil fungal residue carbon,bacterial residue carbon and microbial residue carbon all significantly(P＜0.05)decreased(36.76％,35.13％and 40.32％,respectively),and the annual litter production indirectly affected SOC,fungi biomass,soil bacteria biomass and total microbial biomass,thereby affecting the cumulative effects of soil fungal residue carbon,bacterial residue carbon and total microbial residue carbon,respectively.There was no significant change in the ratio of fungal residue carbon,bacterial residue carbon and total microbial carbon residue to SOC in the early stage of Ph.edulis expansion(from evergreen broad-leaved forest to Ph.edulis and broad-leaved mixed forest),but in the late stage of expansion(from Ph.edulis and broad-leaved mixed forest to Ph.edulis forest),the ratio increased significantly.[Conclusion]The role of microbial carbon on SOC gradually increases during the expansion of Ph.edulis into evergreen broad-leaved forests.[Ch,4 fig.1 tab.26 ref.]
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