Warming drives a ‘hummockification’ of microbial communities associated with decomposing mycorrhizal fungal necromass in peatlands
Warming drives a ‘hummockification’ of microbial communities associated with decomposing mycorrhizal fungal necromass in peatlands
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变暖导致与泥炭地分解菌根真菌坏死物相关的微生物群落“小丘化”
DOI：
10.1111/nph.17755
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发表时间：
2021
期刊：
影响因子：
9.4
通讯作者：
Kennedy, Peter G.
中科院分区：
文献类型：
--
作者：
Maillard, François;Fernandez, Christopher W.;Mundra, Sunil;Heckman, Katherine A.;Kolka, Randall K.;Kauserud, Håvard;Kennedy, Peter G.
死亡真菌菌丝体(坏死体)是土壤碳(C)和养分循环的重要组成部分。评估与分解真菌坏死体相关的微生物群落如何随着全球气温的上升而变化，将有助于确定这些地下有机物输入如何有助于生态系统的响应。在这项研究中，我们表征了与北方泥炭地9°C整个生态系统升温的网袋中培养的多种腐烂菌根真菌坏死体相关的细菌和真菌群落的结构。我们发现，随着气候变暖，腐烂菌根真菌坏死体上的微生物群落发生了重大的分类和功能变化。这些变化在中空微站点中最为明显，显示出向未加热的丘陵中存在的与尸块相关的微生物群落趋同。我们还观察到与坏死体相同属的真菌对埃里克样菌根真菌坏死体的高度定植。这些结果表明，与菌根真菌坏死体分解相关的微生物群落可能会随着未来气候变暖而发生显著变化，这可能会对泥炭地土壤的生物地球化学循环产生强烈影响。此外，同种真菌分解物在埃里克菌根坏死体上的高度富集性可能有助于解释气候变暖泥炭地埃里克族灌木优势度的增加。
Dead fungal mycelium (necromass) represents a critical component of soil carbon (C) and nutrient cycles. Assessing how the microbial communities associated with decomposing fungal necromass change as global temperatures rise will help in determining how these belowground organic matter inputs contribute to ecosystem responses.In this study, we characterized the structure of bacterial and fungal communities associated with multiple types of decaying mycorrhizal fungal necromass incubated within mesh bags across a 9°C whole ecosystem temperature enhancement in a boreal peatland.We found major taxonomic and functional shifts in the microbial communities present on decaying mycorrhizal fungal necromass in response to warming. These changes were most pronounced in hollow microsites, which showed convergence towards the necromass‐associated microbial communities present in unwarmed hummocks. We also observed a high colonization of ericoid mycorrhizal fungal necromass by fungi from the same genera as the necromass.These results indicate that microbial communities associated with mycorrhizal fungal necromass decomposition are likely to change significantly with future climate warming, which may have strong impacts on soil biogeochemical cycles in peatlands. Additionally, the high enrichment of congeneric fungal decomposers on ericoid mycorrhizal necromass may help to explain the increase in ericoid shrub dominance in warming peatlands.