丛枝和外生菌根树种根际细菌群落组成和构建过程

doi:10.13287/j.1001-9332.202608.046

摘要/Abstract

摘要： 菌根类型如何调控森林树木根际细菌群落组成与构建过程尚不清楚。本研究选取亚热带常绿阔叶林(浙江天童站)和温带阔叶红松林(黑龙江帽儿山站)2个气候带典型森林的丛枝菌根(AM)和外生菌根(EcM)树种各5种,分析根际土壤理化性质和细菌群落组成,利用生态位宽度和零模型量化细菌群落构建过程。结果表明:不同气候带森林类型是驱动根际土壤细菌群落变异的主导因素(解释率62.6%),菌根类型贡献较小(2.6%),但菌根效应在不同森林和细菌丰度层级(全物种、优势种、稀有种)间差异显著;土壤氮可利用性(尤其铵态氮)是调控根际细菌群落结构的关键因子。2个气候带森林树种的根际细菌群落标准化效应量均大于2,表明树种根际细菌群落构建过程中确定性过程主导根际细菌群落构建。菌根类型对根际细菌群落构建过程的影响具有显著的森林类型依赖性,在天童站森林确定性过程对AM树种根际细菌群落的影响更强,在帽儿山站则对EcM树种影响更强。本研究揭示了确定性过程在菌根树种根际细菌群落构建中的主导作用,且该作用受到森林类型和菌根类型的双重调节。

关键词: 菌根类型, 根际细菌群落, 群落构建过程, 确定性过程

Abstract: How the mycorrhizal type of tree species regulates the composition and assembly processes of rhizosphere bacterial communities remains unclear. We selected five arbuscular mycorrhizal (AM) and five ectomycorrhizal (EcM) tree species from two typical forests across different climatic zones, namely a subtropical evergreen broadleaved forest at Tiantong Station in Zhejiang and a temperate broadleaved Korean pine forest at Maoershan Station in Heilongjiang. We analyzed the rhizosphere soil physicochemical properties and bacterial community composition, and quantified the assembly processes of bacterial communities by using niche breadth and null model analyses. The results showed that forest type was the dominant factor driving variation in rhizosphere soil bacterial communities (explaining rate 62.6%), with a small contribution from mycorrhizal type (2.6%). However, mycorrhizal effects differed significantly among forest types and bacterial abundance levels, including all species, abundant species, and rare species. Soil nitrogen availability, especially ammonium, was a key factor regulating the structure of rhizosphere bacterial communities. The standardized effect size (SES) values of rhizosphere bacterial communities in both forests were all greater than 2, indicating that deterministic processes dominated the assembly of these communities. The influence of mycorrhizal type on the assembly processes of rhizosphere bacterial communities exhibited significant forest-type dependence. At Tiantong Station, deterministic processes had a stronger influence on AM tree species, whereas at Maoershan Station, this influence was stronger for EcM tree species. This study revealed the dominant role of deterministic processes in the assembly of rhizosphere bacterial communities of mycorrhizal tree species, and this role was dually regulated by forest type and mycorrhizal type.

Key words: mycorrhizal type, rhizosphere bacterial community, community assembly process, deterministic process

相广震, 阴黎明, 王朋, 何杨辉, 周旭辉. 丛枝和外生菌根树种根际细菌群落组成和构建过程[J]. 应用生态学报, 2026, 37(8): 2637-2646.

XIANG Guangzhen, YIN Liming, WANG Peng, HE Yanghui, ZHOU Xuhui. Composition and assembly processes of rhizosphere bacterial communities of arbuscular mycorrhizal and ectomycorrhizal tree species[J]. Chinese Journal of Applied Ecology, 2026, 37(8): 2637-2646.

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