Actinobacteria Emerge as Novel Dominant Soil Bacterial Taxa in Long-Term Post-Fire Recovery of Taiga Forests

作者：Siyu Jiang, Hua Qu, Zhichao Cheng, Xiaoyu Fu, Libin Yang, Jia Zhou · 发表于：Microorganisms · 年份：2025 · DOI：10.3390/microorganisms13061262 · 被引用次数：9 · 研究领域：Soil Carbon and Nitrogen Dynamics、Fire effects on ecosystems、Microbial Community Ecology and Physiology

The long-term post-fire recovery phase is a critical stage for forest ecosystems to progress toward regeneration and mature succession. During this process, soil bacteria exhibit greater environmental adaptability, rapidly driving nutrient cycling and facilitating vegetation restoration. This study investigated the community structure and diversity of soil bacteria during long-term recovery after forest fires in the cold temperate zone, focusing on soils from the 2000 fires in Daxing’anling. Soil samples were classified into Low (L), Moderate (M), and High (H) fire damage intensity, with bacterial community composition and diversity analyzed using Illumina sequencing technology. After long-term fire recovery, the contents of soil organic carbon, black carbon, total nitrogen, alkaline nitrogen, available phosphorus, and available potassium were significantly higher elevated (p < 0.05), and water content was significantly lower, compared with that in the control check (CK) group. Soil urease, fluorescein diacetate, soil acid phosphatase, and soil dehydrogenase activities were significantly higher, and soil sucrase activity was significantly lower in H. There was a significant difference in the Alpha diversity index among the groups. Compared with CK, the Shannon index was significantly increased (p < 0.05) in L, while both Chao1 and Shannon indices were significantly decreased (p < 0.05) in M and significantly higher in H than CK. The results of the PCoA showed that th...