Root carbon interaction with soil minerals is dynamic, leaving a legacy of microbially-derived residues
Root carbon interaction with soil minerals is dynamic, leaving a legacy of microbially-derived residues
复制标题
DOI：
10.1101/2021.03.23.436628
复制
发表时间：
2021-03
期刊：
影响因子：
--
通讯作者：
R. Neurath;J. Pett‐Ridge;Ilexis Chu-Jacoby;D. Herman;T. Whitman;P. Nico;A. Lipton;J. Kyle;M. Tfaily;Allison M. Thompson;M. Firestone
中科院分区：
文献类型：
--
作者：
R. Neurath;J. Pett‐Ridge;Ilexis Chu-Jacoby;D. Herman;T. Whitman;P. Nico;A. Lipton;J. Kyle;M. Tfaily;Allison M. Thompson;M. Firestone
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 carbon source and soil microorganisms also influence mineral-SOM associations, we incubated permeable minerals bags in soil microcosms with and without plants, in a 13CO2 labeling chamber. Mineral bags contained quartz, ferrihydrite, kaolinite, or native soil minerals isolated via density separation. Using 13C-NMR, FTICR-MS, and lipidomics, we traced plant-derived carbon onto minerals harvested from microcosms at three plant growth stages, characterizing total carbon, 13C enrichment, and SOM chemistry. While C accumulation was rapid and mineral-dependent, the accumulated amount was not significantly affected by the presence of plant roots. However, the rhizosphere did shape the chemistry of mineral-associated SOM. Minerals incubated in the rhizosphere were associated with a more diverse array of compounds with different C functional groups (carbonyl, aromatics, carbohydrates, lipids) than minerals incubated in a bulk soil control. These diverse rhizosphere-derived compounds may represent a “transient fraction” of mineral SOM, rapidly exchanging with mineral surfaces. Our results also suggest that many of the lipids which persist on minerals are microbially-derived with a large fraction of fungal lipids. Synopsis This study explores the interaction of rhizosphere carbon, minerals, and microbial influence on the fate of soil carbon. TOC
