Linking soil microbial community to the chemical composition of dissolved organic matter in a boreal forest during freeze-thaw cycles

NWIPB OpenIR

	Linking soil microbial community to the chemical composition of dissolved organic matter in a boreal forest during freeze-thaw cycles
	Yang, Yan; Geng, Jing; Cheng, Shulan; Fang, Huajun; Guo, Yifan; Li, Yuna; Zhou, Yi; Shi, Fangying; Vancampenhout, Karen
	2023
发表期刊	GEODERMA
卷号	431
摘要	Soil dissolved organic matter (DOM) is mainly derived from the microbial degradation of organic matter. Intense freeze-thaw cycles (FTCs) elicited by warming alter the production and consumption of DOM in boreal forest soils, but little is known about the interactions between soil microbial community and DOM chemical composition. In this study, a FTCs incubation experiment was conducted to investigate the association between DOM dynamics and microbial community. DOM fingerprints were characterized using pyrolysis gas chromatographymass spectrometry (Py-GC/MS) technology, and bacterial and fungal community composition was analyzed using high-throughput sequencing and bioinformatics. Both two and six freeze-thaw cycles (2FTCs and 6FTCs) significantly increased soil dissolved organic carbon (DOC) and NH4+-N contents at 0-10 cm and 50-60 cm depths. FTCs significantly decreased the relative abundance of aromatic components in DOM, whereas increasing the relative abundance of polysaccharides and fatty acid methyl esters (FAMEs) in DOM. The degradation of lignin-derived aromatic compounds was accelerated and microbial-derived components accumulated. Also, bacterial community responded more sensitively to FTCs than fungal community. Significant changes in bacterial community network was observed during FTCs with increased linkages, shortened average path lengths, reduced modularity and relative abundance of dominant phyla, and decreased alpha diversity. However, FTCs only increased the average path length of soil fungal community. The higher connectivity indicated that FTCs enhanced the interactions between microbial community and DOM chemical components. FTCs led to a shift in bacterial keystone taxa from being present in specific DOM molecules to competing for common substrates. Overall, FTCs tended to activate DOM and increase availability, which could promote DOM turnover and increase soil C stabilization. These findings provide new insights into the molecular mechanisms of DOM dynamics in the boreal forest soils under increased FTCs.
收录类别	SCIE
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/61706
专题	中国科学院西北高原生物研究所
推荐引用方式 GB/T 7714	Yang, Yan,Geng, Jing,Cheng, Shulan,et al. Linking soil microbial community to the chemical composition of dissolved organic matter in a boreal forest during freeze-thaw cycles[J]. GEODERMA,2023,431.
APA	Yang, Yan.,Geng, Jing.,Cheng, Shulan.,Fang, Huajun.,Guo, Yifan.,...&Vancampenhout, Karen.(2023).Linking soil microbial community to the chemical composition of dissolved organic matter in a boreal forest during freeze-thaw cycles.GEODERMA,431.
MLA	Yang, Yan,et al."Linking soil microbial community to the chemical composition of dissolved organic matter in a boreal forest during freeze-thaw cycles".GEODERMA 431(2023).