Effects of Indocalamus tessellatus expansion into coniferous and broad-leaved mixed forest on species diversity and soil physicochemical properties
[Objective]This study aims to clarify the impact of the expansion of I.tessellatus into coniferous and broad-leaved mixed forest on community composition,vegetation diversity,and soil physicochemical properties,thus deepening our understanding of I.tessellatus expansion as well as providing theoretical support for the healthy and sustainable management of forest stands.[Method]In this study,the continuous ecological surface of natural Indocalamus forest which expanded and replaced coniferous and broad-leaved mixed forest in Taiping Experimental Center Forest Farm of Anhui International Bamboo and Rattan Center was taken as the research object.I.tessellatus pure forest(IF),I.tessellatus and broadleaved mixed forest(IMF)and coniferous broad-leaved mixed forest(MF)were chosen as research samples.Simpson index and Pielou evenness index were adopted to investigate the community species diversity.Soil physicochemical properties were also compared.[Result](1)The expansion of I.tessellatus into broad-leaf forest has led to the decrease of the species and number of the dominant species in the forest.Camellia japonica,Choerospondias axillaris,Lindera aggregata,Hedera nepalensis var.sinensis and Lithocarpus glaber all disappeared in the pure forest of I.tessellatus.There was a marked decrease in the number of shared species such as Pteridium aquilinum var.latiusculum,Eurya japonica,Symplocos stellaris and Loropetalum chinense.The richness and evenness indices of the wood,shrub and herb layers decreased,and the community structure was simplified.(2)Soil properties have also changed with the expansion of I.tessellatus.Compared with the broadleaved forest,the contents of soil SWC,SOC,TN,TP,Mg,DOC,DON,MBC and MBN decreased,and the content of soil K increased.Except for DOC,DON,MBC and MBN,soil nutrient accumulation decreased with soil depth.[Conclusion]The expansion of I.tessellatus into the mixed forest resulted in the decrease of the species and quantity of the original dominant species in the forest,the decrease of the richness and evenness index of the tree laye,the simplification of the community structure,the forest degradation and a decline of soil quality.
Indocalamus tessellatusconiferous and broad-leaved mixed forestexpansionforest community structurephysical and chemical properties of soil
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