Study on Microbial Community Function of Bothriochloa ischaemum Litter at Different Decomposition Stages in Copper Tailings Area
Litter decomposition plays an important role in the energy flow and material cycle of grassland ecosystem,and is one of the'bonds'connecting the two major carbon pools,organisms and soil.In this study,Bothriochloa ischaemum,the dominant vegeta-tion in Zhongtiaoshan copper mining area of Shanxi Province,was selected as the research object.The litter decomposition process was simulated in the native habitat.The microbial community structure,function,and key influencing factors at different decomposi-tion stages(100 days,200 days,460 days)were investigated based on metagenomic sequencing technology.The results showed that(1)the litter microbial community of B.ischaemum contained 125 phyla,1 069 families,2 800 genera and 12 364 species,and the dominant bacteria were Proteobacteria and Actinomycetes;(2)the metabolic function of microorganisms was the most active in the process of microbial decomposition of litter,especially carbohydrate metabolism and energy metabolism based on egg NOG and KEGG databases;(3)the key driven factors affecting the functions of microbial communities were litter pH,C/N,polyphenol oxi-dase,cellulase,litter heavy metals cadmium and lead.The results clarified the functional characteristics of microbial carbon metabo-lism during litter decomposition in damaged ecosystems.At the same time,exploring the important ecological functions played by lit-ter microbes can provide a scientific basis for revealing the contribution of litter microbes to soil carbon pool in copper tailings area.
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