Climate induced microbiome alterations increase cadmium bioavailability in agricultural soils with pH below 7

IF 8.1 1区 地球科学 Q1 ENVIRONMENTAL SCIENCES Communications Earth & Environment Pub Date : 2024-10-30 DOI:10.1038/s43247-024-01794-w
Sören Drabesch, Oliver J. Lechtenfeld, Esmira Bibaj, José M. León Ninin, Juan Lezama Pachecco, Scott Fendorf, Britta Planer-Friedrich, Andreas Kappler, E. Marie Muehe
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Abstract

Climate change and metals independently stress soil microbiomes, but their combined effects remain unresolved. Here we show that future climate affects soil cadmium through altered soil microbiome and nutrient cycles, with soil pH as critical factor. In soils with pH<7 and during summer temperatures, future climate increased porewater cadmium, shifting total and potentially active taxonomic microbiome structures. Microbial ammonium oxidation released protons liberating cadmium through cation exchange from mineral surfaces. When porewater cadmium levels became toxic to non-cadmium-tolerant bacteria, microbial activity, and nutrient cycling decreased, reducing carbon and nitrogen emissions. In contrast, pH>7 soil show no climate impacts on cadmium mobilization, though imprints on microbiome structure were apparent. Subsequent nutrient cycling increased under future climate, stimulating soil respiration and nitrous oxide release. These findings underscore complex interactions between climate change and soil contaminants affecting the soil microbiome and its activity and highlights potential impacts on crop production, groundwater quality, and climate feedback. Complex interactions between future climate, soil microbiome, and soil cadmium negatively impact microbial activity and nutrient cycling in soil with pH below 7, which potentially affects crop production, groundwater quality, and climate feedback, according to a series of laboratory experiments conducted with sampled soil.

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气候诱发的微生物群改变提高了 pH 值低于 7 的农用土壤中的镉生物利用率
气候变化和金属分别对土壤微生物组造成压力,但它们的综合影响仍未得到解决。在这里,我们展示了未来气候通过改变土壤微生物组和养分循环对土壤镉的影响,其中土壤 pH 值是关键因素。在 pH<7 和夏季温度较高的土壤中,未来气候会增加孔隙水的镉含量,改变微生物群的总结构和潜在的活性分类结构。微生物的铵氧化作用释放出质子,通过矿物表面的阳离子交换释放出镉。当孔隙水的镉含量对不耐镉细菌产生毒性时,微生物活动和养分循环减少,碳和氮的排放量也随之减少。与此相反,pH>7 土壤显示气候对镉迁移没有影响,但对微生物群结构的影响却很明显。在未来气候条件下,随后的养分循环增加,刺激了土壤呼吸和氧化亚氮的释放。这些发现强调了气候变化与影响土壤微生物组及其活动的土壤污染物之间复杂的相互作用,并突出了对作物生产、地下水质量和气候反馈的潜在影响。根据对取样土壤进行的一系列实验室实验,未来气候、土壤微生物群和土壤镉之间的复杂相互作用对pH值低于7的土壤中的微生物活动和养分循环产生了负面影响,这可能会影响作物产量、地下水质量和气候反馈。
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来源期刊
Communications Earth & Environment
Communications Earth & Environment Earth and Planetary Sciences-General Earth and Planetary Sciences
CiteScore
8.60
自引率
2.50%
发文量
269
审稿时长
26 weeks
期刊介绍: Communications Earth & Environment is an open access journal from Nature Portfolio publishing high-quality research, reviews and commentary in all areas of the Earth, environmental and planetary sciences. Research papers published by the journal represent significant advances that bring new insight to a specialized area in Earth science, planetary science or environmental science. Communications Earth & Environment has a 2-year impact factor of 7.9 (2022 Journal Citation Reports®). Articles published in the journal in 2022 were downloaded 1,412,858 times. Median time from submission to the first editorial decision is 8 days.
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