Driving force of soil microbial community structure in a burned area of Daxing'anling, China

• 作者: Meng Meng Bing Wang Qiuliang Zhang Yuan Tian
• 来源期刊: 林业研究（英文版）
• 年，卷（期）: 2021,（4）
• 所属期刊栏目: ORIGINAL PAPERS
• 页码范围: 1723-1738
• 页数: 16页
• 语种: 英文

摘要

Fires are an important factor impacting forest ecosystems of Daxing'anling and have a significant effect on soil microbial community structure. In this study, high-throughput sequencing for 16S rDNA and ITS rDNA were applied to analyze the changing characteristics and driv-ing factors of bacterial and fungal community structures in burned areas with different fire severity. PICRUSt2 software was used to predict the functional characteristics of burned areas with different fire severity. The purpose was to unveil the responsive relationships among the structure and func-tion of bacterial and fungal communities, fire severity, and post-disturbance restoration times. After high severity fires, the destruction of surface vegetation and loss of soil nutri-ents reduced the diversity and abundance of soil bacteria and fungi. The soil bacteria community structure, which was dominated by Acidobacteria, Proteobacteria , and Act-inobacteria, changed to be dominated by Proteobacteria and Chloroflexi . As well, soil fungal community changed from domination by Helotiales, Eurotiales and Russulales to domination by Archaeorhizomycetales and Helotiales . Over time, soil bacterial community was gradually restored to pre-fire levels 30 years after the fire. Soil fungal community changed and failed to restore to pre-fire levels after 30 years. After low/intermediate severity fires, environmental factors were relatively unchanged so that soil bacteria diversity and abundance increased, optimizing community composition. The diversity and abundance of soil fungi decreased and the community structure changed slightly. Over time, both bacterial and fungal communities were gradually restored to pre-fire levels 30 years after the fire. After fire disturbance, with increasing severity, soil carbon fixation, lignin degra-dation, mineralization of organic nitrogen and hydrolysis of organic phosphorus are enhanced. Denitrification is weak-ened. Therefore, forest fires have certain positive effects on carbon, nitrogen and phosphorus cycles where soil bacteria and fungi are involved.