Changes in physicochemical properties and microbial community diversity during walnut green peel composting process
[Objective]Solving the problem of resource utilization of walnut green peel.[Method]By measuring the physicochemical indicators,microbial community species abundance,and community diversity during walnut green peel composting process,analyzing the degradation effect of microbial community,and identifying the dominant bacterial groups in compost at different fermentation stages.Microbial metabolic function analysis was conducted using KEGG and MetaCyc databases.[Result]The main bacterial communities during the thermophilic period were Staphylococcus and Serratia,while the dominant fungal communities were Candida,Penicillium,Aspergillus,and Gibellulopsis;During the thermophilic phase,the dominant bacterial community was Nocardiopsis,while the dominant fungal community was Sodiomyces;During the cooling period,the dominant bacterial communities were Staphylococcus,Nocardiopsis,and Xanthomonadaceae.The dominant fungal communities were Sodiomyces and Candida;During the maturation stage,the dominant bacterial groups were Oceanobacillus,Staphylococcus,Sinibacillus,and Bacillus,while the dominant fungal group was unclassified_f__Dipodascuceae,Dipodascus,and Sodiomyce.The functional analysis of microorganisms showed that the relative abundance of microorganisms was high in metabolic processes and life activity related pathways,indicating that microorganisms effectively degraded walnut green peel through active metabolic activities.The correlation analysis between the physicochemical indicators of composting and microbial diversity showed that temperature,pH value,and electrical conductivity of composting had a significant impact on the relative abundance of microbial.[Conclusion]During the composting process of walnut green peels,it was crucial to monitor the changes in microbial communities at various stages.By optimizing the microbial environment through adjustments to physical and chemical indicators,such as temperature,pH value,and conductivity,can enhance both the degradation efficiency of the walnut green peels and the quality of the resulting compost.
walnut green peelcompostingphysicochemical propertiesmicrobial community diversity
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