Arctic soil respiration and microbial community structure driven by silicon and calcium

微生物种群生物学 盐度 北极的 土壤水分 环境科学 放线菌门 全球变暖 土壤碳 环境化学 农学 生态学 化学 土壤科学 气候变化 细菌 生物 生物化学 遗传学 16S核糖体RNA 基因
作者
Peter Stimmler,Anders Priemé,Bo Elberling,Mathias Goeckede,Jörg Schaller
出处
期刊:Science of The Total Environment [Elsevier BV]
卷期号:838: 156152-156152 被引量:10
标识
DOI:10.1016/j.scitotenv.2022.156152
摘要

Global warming is most pronounced in the Arctic region. Greenhouse gas (GHG) release from Arctic soils increase due to global warming. By this, the Arctic may change from currently being a carbon sink to a future source. To improve accurate predictions of future GHG release from Arctic soils, it is important to unravel factors controlling both the microbial community structure and activity. Soil microbial activity is important for Arctic greenhouse gas production, but depends on soil conditions such as salinity being increased by calcium (Ca) and decreased by amorphous silica (Si) potentially enhancing water availability. In the Arctic, climate changes may alter salinity by changing Si and Ca concentrations upon permafrost thaw as a result of global warming with Si potentially decreasing and Ca potentially increasing salinity. Here, we show that higher Si concentration increased and higher Ca concentrations decreased the microbial CO2 production for both a salt-poor and a salt-rich soil from Greenland. In the salt-rich soil, Si amendment increased CO2 production and the abundance of gram-negative bacteria. However, the bacterial community became dominated by spore-forming gram-positive Firmicutes and Actinobacteria. The CO2 release from soils was directly affected by the abundance of bacteria and fungi, and their community structure. Our results highlight the importance of the soil Si and Ca concentration on organic carbon turnover by strongly changing microbial abundance and community structure, with consequences for CO2 release in the Arctic. Consequently, Ca and Si and their relation to Arctic soil microbial community structure has to be considered when estimating pan-Arctic carbon budgets.
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