Shanxi Key Laboratory of Ecological Restoration on Loess Plateau, Institute of Loess Plateau, Shanxi University, Taiyuan, 030006, China.
Shanxi Dibao Energy Co., LTD, Taiyuan, 030045, China.
Fungal Biol. 2023 Oct-Nov;127(10-11):1426-1438. doi: 10.1016/j.funbio.2023.10.008. Epub 2023 Oct 28.
Among influencing biotic and abiotic factors, microorganisms predominate litter decomposition, playing an important role in maintaining the ecosystem material cycle. Bothriochloa ischaemum was the dominant plant species in China's Eighteen River tailings dam, and it was selected as the research object. We explored the dynamic of fungal community characteristics in B. ischaemum litter during different decomposition stages and investigated relevant driving factors affecting associative dynamic changes. Results showed that Ascomycetes and Basidiomycetes were the dominant phyla during litter decomposition. At a class level, the relative abundance of Dothideomycetes gradually decreased as litter decomposition progressed while Sordariomycetes gradually increased, ultimately becoming the dominant class. The community structure of the fungal community was mainly affected by litter pH, total carbon (TC), and copper (Cu) content. The fungal community's network structure was the most complex compared to other decomposition stages after 200 days of litter decomposition. Additionally, the fungal community's modularity gradually increased, while the degree of functional differentiation also increased, strengthening fungal community stability during litter decomposition. This study clarifies fungal community structure during litter decomposition in this copper tailings area, and provides a scientific basis for further improving soil fertility and nutrient cycling in mining areas.
在影响生物和非生物因素中，微生物主导着凋落物分解，在维持生态系统物质循环方面发挥着重要作用。双穗雀稗是中国十八家河尾矿坝的优势植物种，被选作研究对象。我们探索了不同分解阶段双穗雀稗凋落物中真菌群落特征的动态，并研究了相关驱动因素对关联动态变化的影响。结果表明，在凋落物分解过程中，子囊菌门和担子菌门是主要的门。在纲水平上，随着凋落物分解的进行，Dothideomycetes 的相对丰度逐渐降低，而 Sordariomycetes 逐渐增加，最终成为主要的纲。真菌群落的结构主要受凋落物 pH 值、总碳 (TC) 和铜 (Cu) 含量的影响。与其他分解阶段相比，在凋落物分解 200 天后，真菌群落的网络结构最为复杂。此外，真菌群落的模块性逐渐增加，功能分化程度也增加，从而增强了凋落物分解过程中真菌群落的稳定性。本研究阐明了铜尾矿库区凋落物分解过程中的真菌群落结构，为进一步提高矿区土壤肥力和养分循环提供了科学依据。
