内蒙古不同气候带白桦外生菌根真菌群落结构及影响因素
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国家自然科学基金项目(31760169);内蒙古自治区自然科学基金面上项目(2017MS0310);内蒙古自治区高等学校科学研究项目(NJZY16043)


Ectomycorrhizal community structure and driving factors of Betula platyphylla in different climate zones in Inner Mongolia
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    摘要:

    白桦是天然次生林生态系统演替过程中的先锋树种,是典型的外生菌根树种。基于Illumina Miseq高通量测序技术及生物信息学方法,分析了白桦外生菌根真菌多样性和群落结构及其驱动因素。结果表明,白桦根围土壤中共获得261个外生菌根真菌OTUs,隶属于2门、4纲、11目、29科、50属。在门水平上,担子菌门(Basidiomycota)真菌相对丰度占93.5%;其余为子囊菌门(Ascomycota)真菌,相对丰度占6.5%。在属水平上,相对丰度≥1%的优势属共有16个,其中红菇属(Russula,32.1%)、蜡壳耳属(Sebacina,19.9%)和丝膜菌属(Cortinarius,11.8%)的相对丰度最高,分布广泛,在所有样点均有出现。采用RDA和SPSS分析了外生菌根真菌群落组成差异的驱动因素,pH值、总氮、土壤含水量和速效钾对外生菌根真菌的分布均有极显著影响,其中,pH值对外生菌根真菌多样性及群落结构变化的解释度最高,为34.3%,其次为总氮、土壤含水量和速效钾,解释度分别为25.1%、16.8%和5.4%。研究结果阐明了跨气候带白桦外生菌根真菌的群落结构和影响因素,可为深入理解及预测全球气候变化对森林生态系统的影响提供理论依据。

    Abstract:

    Betula platyphylla is a pioneer species in the succession of natural secondary forest ecosystem and a typical ectomycorrhizal tree species. The ectomycorrhizal fungal diversity and community structure and their driving factors were studied using high-throughput sequencing technology. The results showed that a total of 261 operational taxonomic units (OTUs) were detected in the rhizosphere soil of Betula platyphylla, belonging to 2 phyla, 4 classes, 11 orders, 29 families, and 50 genera. At the phylum level, the relative abundance of Basidiomycota fungi accounted for 93.5%; the rest were Ascomycota fungi, with the relative abundance of 6.5%. At the genus level, there were 16 dominant genera with relative abundance ≥ 1%. Among them, Russula (32.1%), Sebacina (19.9%) and Cortinarius (11.8%) had the highest relative abundance and were widely distributed, appearing in all samples. Redundancy analysis and SPSS were employed to analyze the driving factors of ectomycorrhizal fungal community composition. The pH, total nitrogen (TN), soil water content (SWC) and available potassium (AK) had very significant effect on the community composition. Among them, the pH has the highest variance explained of 34.3%, followed by TN, SWC and AK, with the variance explained of 25.1%, 16.8% and 5.4%, respectively. The results clarified the ectomycorrhizal fungal community structure and influencing factors of Betula platyphylla across climatic zones, and provided a theoretical basis for in-depth understanding and prediction of the impact of global climate change on forest ecosystems.

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李敏,吕桂芬,牛艳芳,孟兆云,杨勋爵.内蒙古不同气候带白桦外生菌根真菌群落结构及影响因素.生态学报,2022,42(12):4847~4860

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