根际
化学
矿物
环境化学
碳纤维
大块土
土壤水分
溶解有机碳
微观世界
土壤碳
粘土矿物
土壤有机质
矿物学
环境科学
地质学
土壤科学
复合数
古生物学
复合材料
有机化学
材料科学
细菌
作者
Rachel Neurath,Jennifer Pett‐Ridge,Ilexis Chu‐Jacoby,Donald J. Herman,Thea Whitman,Peter Nico,Andrew S. Lipton,Jennifer Kyle,Malak M. Tfaily,Allison Thompson,Mary K. Firestone
标识
DOI:10.1021/acs.est.1c00300
摘要
Minerals preserve the oldest, most persistent soil carbon, and mineral characteristics appear to play a critical role in the formation of soil organic matter (SOM) associations. To test the hypothesis that roots, and differences in carbon source and microbial communities, influence mineral SOM associations over short timescales, we incubated permeable mineral bags in soil microcosms with and without plants, inside a 13CO2 labeling chamber. Mineral bags contained quartz, ferrihydrite, kaolinite, or soil minerals isolated via density separation. Using 13C-nuclear magnetic resonance, Fourier transform ion cyclotron resonance mass spectrometry, and lipidomics, we traced carbon deposition onto minerals, characterizing total carbon, 13C enrichment, and SOM chemistry over three growth stages of Avena barbata. Carbon accumulation was rapid and mineral-dependent but slowed with time; the accumulated amount was not significantly affected by root presence. However, plant roots strongly shaped the chemistry of mineral-associated SOM. Minerals incubated in a plant rhizosphere were associated with a more diverse array of compounds (with different functional groups-carbonyl, aromatics, carbohydrates, and lipids) than minerals incubated in an unplanted bulk soil control. We also found that many of the lipids that sorbed to minerals were microbially derived, including many fungal lipids. Together, our data suggest that diverse rhizosphere-derived compounds may represent a transient fraction of mineral SOM, rapidly exchanging with mineral surfaces.
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