College of Ecology and Environment, Inner Mongolia University, Hohhot 010000, China.
College of Ecology and Environment, Inner Mongolia University, Hohhot 010000, China; Key Laboratory of Ecology and Resource Use of the Mongolian Plateau, Ministry of Education of China, Inner Mongolia University, Hohhot 010000, China; Collaborative Innovation Center for Grassland Ecological Security, Ministry of Education of China, Inner Mongolia University, Hohhot 010000, China.
Sci Total Environ. 2022 Nov 1;845:157197. doi: 10.1016/j.scitotenv.2022.157197. Epub 2022 Jul 14.
Lignocellulose, which contains cellulose, hemicellulose and lignin, is one of the most important factors determining the rate and quality of compost decomposition, and the microbial community composition affects the rate of lignocellulose decomposition. Interactions between microbial taxa contribute significantly to ecosystem energy flow and material cycling. However, it is not clear how interactions between microbial taxa affect the degradation of lignocellulose during the composting process. For this reason we carried out aerobic co-composting experiments with maize straw and cattle manure to explore the contribution of microbial community diversity and the interaction between taxa to lignocellulosic degradation. The results showed that moisture and temperature had the greatest effect on microbial communities during composting and that lignocellulose degradation was dominated by microbial co-occurrence networks rather than microbial community diversity. Overall co-occurrence network and bacterial-fungal interactions explained 23.9-84.1 % of lignocellulosic degradation, whereas microbial diversity only accounted for 24.6-31.5 %. Interestingly, keystone taxa analysis of the microbial co-occurrence networks revealed that low-abundance taxa influenced microbial interactions driving lignocellulose degradation. Our results provide a new perspective for understanding lignocellulose degradation during composting, offering insights into important microbial interaction mechanisms for improving compost quality and efficiency.
木质纤维素包含纤维素、半纤维素和木质素，是决定堆肥分解速率和质量的最重要因素之一，而微生物群落组成则影响木质纤维素的分解速率。微生物类群之间的相互作用对生态系统能量流动和物质循环有重要贡献。然而，微生物类群之间的相互作用如何影响堆肥过程中木质纤维素的降解尚不清楚。出于这个原因，我们进行了玉米秸秆和牛粪的好氧共堆肥实验，以探索微生物群落多样性和类群间相互作用对木质纤维素降解的贡献。结果表明，在堆肥过程中，水分和温度对微生物群落的影响最大，木质纤维素的降解主要由微生物共同发生网络而不是微生物群落多样性主导。总体而言，共同发生网络和细菌-真菌相互作用解释了 23.9-84.1%的木质纤维素降解，而微生物多样性仅占 24.6-31.5%。有趣的是，微生物共同发生网络的关键种分析表明，低丰度类群影响了驱动木质纤维素降解的微生物相互作用。我们的研究结果为理解堆肥过程中的木质纤维素降解提供了新的视角，为提高堆肥质量和效率的重要微生物相互作用机制提供了新的见解。
