Vegetation type, not the legacy of warming, modifies the response of microbial functional genes and greenhouse gas fluxes to drought in Oro-Arctic and alpine regions.
Vegetation type, not the legacy of warming, modifies the response of microbial functional genes and greenhouse gas fluxes to drought in Oro-Arctic and alpine regions.
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DOI：
10.1093/femsec/fiad145
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发表时间：
2023-11-13
影响因子：
4.2
通讯作者：
中科院分区：
文献类型：
--
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气候变暖和夏季干旱会改变土壤微生物活动，影响北极和高山地区的温室气体（GHG）排放。然而，人们对变暖的长期影响以及对未来微生物恢复能力的影响知之甚少。我们使用经过原位长期实验变暖的一个高山土壤和三个北极土壤，在实验室培养箱中模拟干旱，以测试微生物功能基因丰度如何影响三种温室气体（二氧化碳、甲烷和一氧化二氮）的通量。我们发现功能基因丰度对干旱和变暖的反应与植被类型和土壤碳密切相关。我们的场地范围从潮湿、杂草为主、土壤碳丰富的系统到干燥、土壤碳贫乏的高山场地。在较湿润、富含碳的系统中，功能基因丰度以及甲烷和二氧化碳通量的恢复能力较低。然而，我们没有发现干旱或变暖对一氧化二氮通量的影响。所有基因-温室气体关系都受到植被类型的影响，在潮湿、富含杂草的土壤中观察到更强的影响。这些结果表明，变暖和干旱对温室气体排放的影响与一组复杂的微生物基因丰度有关，并且可能是特定于栖息地的。在奥罗-北极和高山地区，在确定微生物功能基因对干旱的反应时，变暖的影响不如植被类型重要。
Climate warming and summer droughts alter soil microbial activity, affecting greenhouse gas (GHG) emissions in Arctic and alpine regions. However, the long-term effects of warming, and implications for future microbial resilience, are poorly understood. Using one alpine and three Arctic soils subjected to in situ long-term experimental warming, we simulated drought in laboratory incubations to test how microbial functional-gene abundance affects fluxes in three GHGs: carbon dioxide, methane, and nitrous oxide. We found that responses of functional gene abundances to drought and warming are strongly associated with vegetation type and soil carbon. Our sites ranged from a wet, forb dominated, soil carbon-rich systems to a drier, soil carbon-poor alpine site. Resilience of functional gene abundances, and in turn methane and carbon dioxide fluxes, was lower in the wetter, carbon-rich systems. However, we did not detect an effect of drought or warming on nitrous oxide fluxes. All gene–GHG relationships were modified by vegetation type, with stronger effects being observed in wetter, forb-rich soils. These results suggest that impacts of warming and drought on GHG emissions are linked to a complex set of microbial gene abundances and may be habitat-specific. Over Oro-Arctic and alpine regions, the legacy of warming is less important than vegetation type when determining the response of microbial functional genes to drought.
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