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摘要
桉树混交林在促进土壤养分循环、提高生产力和生态系统功能等方面有重要作用。菌根共生是影响混交林种间互作关系的重要因素。然而,不同菌根类型的混交树种对桉树人工林土壤微生物群落结构及功能的影响尚缺乏研究。该研究以桉树纯林及其与降香黄檀(Dalbergia odorifera,固氮-丛枝菌根树种)、火力楠(Michelia macclurei,丛枝菌根树种)、麻栎(Quercus acutissima,外生菌根树种)的混交林为研究对象,利用宏基因组测序技术,探究4种不同林型土壤微生物群落多样性、结构功能、细菌-真菌共现网络模式差异及其与土壤养分的关系。结果表明:混交林显著提高土壤微生物群落物种丰富度,改变微生物功能,增加微生物共现网络复杂性。降香黄檀与桉树混交林土壤微生物丰富度、细菌群落好氧化能异养和发酵功能基因相对丰度、真菌-细菌微生物共现网络模块度均最高;土壤细菌、真菌群落结构与其他3种林型差异显著。火力楠与桉树、麻栎与桉树混交林土壤细菌、真菌的碳氢化合物降解、氮固定、甲烷氧化功能基因相对丰度均高于桉树纯林。外生菌根树种(麻栎)与桉树混交林土壤微生物共现网络边数、平均度及网络稳定性最高,其核心微生物丰度与NO-3水平显著相关。丛枝菌根树种(降香黄檀、火力楠)与桉树混交林土壤核心微生物丰度与NH+4水平显著相关。
关键词
桉树
/
混交林
/
菌根类型
/
土壤微生物
/
共现网络
Key words
Eucalyptus
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mixed-species plantations
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mycorrhizal type
/
soil microbial community
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co-occurrence network
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王亚鑫,朱媛,孟森,明安刚,贾宏炎,覃方锉,陆俊锟.
不同菌根类型树种与桉树混交对土壤微生物群落的影响[J].
植物研究, 2025, 45(03): 447-459 DOI:10.7525/j.issn.1673-5102.2025.03.014
基金资助
中国林业科学研究院基本科研业务费项目(CAFYBB2023MA007)
国家自然科学基金面上项目(3247141238)
国家重点研发计划课题(2023YFD2201005)
广东省基础与应用基础研究基金项目(2022A1515010413)