亚高山森林演替序列中土壤细菌群落组成和功能对树木幼苗建立的影响

doi:10.1093/jpe/rtag119

Journal of Plant Ecology

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亚高山森林演替序列中土壤细菌群落组成和功能对树木幼苗建立的影响

收稿日期:2025-03-21 接受日期:2026-05-21

Effects of soil bacterial community composition and function on tree seedling establishment during subalpine forest succession

Xiaohu Wang^a, Wenqiang Zhao^a,*, Yutian Wu^a,b, Yongping Kou^a, Jia Liu^a, Mei Liu^c, Qing Liu^a

^aMountain Ecological Restoration and Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610213, China
^bUniversity of Chinese Academy of Sciences, Beijing 100049, China
^cEcological Security and Protection Key Laboratory of Sichuan Province, Mianyang Normal University, Mianyang 621000, China
Email address: zhaowq@cib.ac.cn (W. Zhao)

Received:2025-03-21 Accepted:2026-05-21
Supported by:
This study was supported jointly by the National Natural Science Foundation of China (U24A20352, 32401547, 32171550 and 32201529), CAS "Light of West China" Program (E5C2030001), China Postdoctoral Science Foundation (2024M76318), Postdoctoral Fellowship Program of CPSF (GZC20232574), Sichuan Science and Technology Program (2023ZYD0102 ).

摘要/Abstract

摘要： 植物-土壤微生物的相互作用在群落动态中发挥着重要作用。虽然细菌介导的植物–土壤反馈（PSF）在草地演替中发挥关键作用，但细菌调控的PSF如何影响森林演替进程中树木幼苗的定居仍不清楚。本研究以川西亚高山森林演替前期、中期与后期优势植物根围土壤为微生物接种材料，与迹地土壤混合后分别栽培速生阔叶幼苗（白桦、红桦）和慢生针叶幼苗（粗枝云杉、岷江冷杉），室内培养完成后测定植株生物量、土壤细菌群落结构及土壤化学性质。研究结果表明，阔叶幼苗受负生物反馈作用更显著，针叶幼苗则表现出更强的正生物反馈作用，且该差异在接种演替中期、后期土壤处理中尤为突出。阔叶幼苗生物量与寡营养型细菌相对丰度呈显著正相关，与富营养型细菌相对丰度呈显著负相关；针叶幼苗则呈现相反趋势。此外，寡营养型细菌中的α-变形菌门（固氮细菌）和绿弯菌门（亚硝酸盐氧化细菌）分别是影响阔叶树种、针叶树苗幼苗生物量变异的关键细菌类群。综上，细菌对树木幼苗定居的调控作用具有显著的物种特异性。不同生活史策略的树种因养分需求与病原菌抗性差异，可重塑土壤细菌群落组成与功能，有效缓解土壤养分限制、削弱植物与土壤微生物间的养分竞争。本研究结果为揭示细菌功能类群在调控演替后期树木幼苗植物-土壤反馈效应中的潜在作用提供了新的见解。

关键词: 森林演替, 细菌群落组成与功能, 生活史策略, 植物-土壤反馈, 树苗

Abstract: Plant-soil microbe interactions play a significant role in community dynamics. While bacteria play important roles in driving plant-soil feedback (PSF), which regulates grassland succession, it remains unclear how bacteria-mediated PSF influences tree seedling establishment during forest succession. A pot experiment of four tree seedlings (fast-growing broadleaf Betula platyphylla and Betula albosinensis, and slow-growing coniferous Picea asperata and Abies faxoniana), using sterilized soil inoculated with rooting zone soils from dominant plant species at the early, mid- and late-successional stages in a subalpine forest, was conducted in a greenhouse. Plant biomass, soil bacterial communities, and soil chemical properties were measured. Broadleaf experienced stronger negative biotic feedbacks, while coniferous generated more positive biotic feedbacks, especially in mid- and late-successional inoculated soils. Controlled pot experiments demonstrate that broadleaf biomass was correlated positively with the relative abundance of oligotrophic bacteria but negatively with copiotrophic bacteria, while this trend was opposite in coniferous. Oligotrophs, namely, Alphaproteobacteria (nitrogen-fixing bacteria) and Chloroflexi (nitrite oxidizing bacteria), were the dominant influential factors of the variations in broadleaf and coniferous biomass, respectively. These results indicate that the benefit of bacteria on tree seedling establishment is species specific. It can be inferred that plant nutritional requirements and pathogen resistance among plants with different life-history strategies may alter the composition and function of bacteria, thus alleviating soil nutrient limitation and plant-soil microbe nutrient competition. Our findings provide new insights into the potential role of bacterial functional groups in shaping the PSFs of late-successional tree seedlings.

Key words: forest succession, bacterial community composition and function, life-history strategies, plant-soil feedback, tree seedlings

. 亚高山森林演替序列中土壤细菌群落组成和功能对树木幼苗建立的影响[J]. Journal of Plant Ecology, DOI: 10.1093/jpe/rtag119.

Xiaohu Wang, Wenqiang Zhao, Yutian Wu, Yongping Kou, Jia Liu, Mei Liu, Qing Liu. Effects of soil bacterial community composition and function on tree seedling establishment during subalpine forest succession[J]. J Plant Ecol, DOI: 10.1093/jpe/rtag119.

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亚高山森林演替序列中土壤细菌群落组成和功能对树木幼苗建立的影响

Effects of soil bacterial community composition and function on tree seedling establishment during subalpine forest succession

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