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Bacterial communities and enzyme activities during litter decomposition of Elymus nutans leaf on the Qinghai-Tibet Plateau

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Journal of Mountain Science 2024年第10期21卷 3249-3262页

作者： ZHANG Zhiyang JIAO Yi DONG Xiaogang MA Yinshan ZHANG Shiting State Key Laboratory of Herbage Improvement and Grassland Agro-ecosystems College of EcologyLanzhou UniversityLanzhou 730000China Center for Volatile Interactions(VOLT)and Terrestrial Ecology Section Department of BiologyUniversity of CopenhagenCopenhagen DK-2100Denmark College of Agriculture and Ecological Engineering Hexi UniversityZhangye 734000China

The dominant plant litter plays a crucial role in carbon(C)and nutrients cycling as well as ecosystem functions maintenance on the Qinghai-Tibet Plateau(QTP).The impact of litter decomposition of dominant plants on edaphic parameters and grassland productivity has been extensively studied,while its decomposition processes and relevant mechanisms in this area remain poorly *** conducted a three-year litter decomposition experiment in the Gansu Gannan Grassland Ecosystem National Observation and Research Station,an alpine meadow ecosystem on the QTP,to investigate changes in litter enzyme activities and bacterial and fungal communities,and clarify how these critical factors regulated the decomposition of dominant plant Elymus nutans(***)*** results showed that cellulose and hemicellulose,which accounted for 95%of the initial lignocellulose content,were the main components in *** litter *** litter enzyme activities ofβ-1,4-glucosidase(BG),β-1,4-xylosidase(BX),andβ-D-cellobiosidase(CBH)decreased with decomposition while acid phosphatase,leucine aminopeptidase,and phenol oxidase increased with *** found that both litter bacterial and fungal communities changed significantly with ***,bacterial communities shifted from copiotrophic-dominated to oligotrophic-dominated in the late stage of litter *** least squares path model revealed that the decomposition of *** litter was mainly driven by bacterial communities and their secreted *** and Proteobacteria were important producers of enzymes BG,BX,and CBH,and their relative abundances were tightly positively related to the content of cellulose and hemicellulose,indicating that Bacteroidota and Proteobacteria are the main bacterial taxa of the decomposition of *** *** conclusion,this study demonstrates that bacterial communities are the main driving forces behind the decomposition of *** litter,high

关键词： Litter decomposition lignocellulose matrix Bacterial community Litter enzyme activity Elymus nutans Qinghai-Tibet Plateau

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