Sticky dead microbes: Rapid abiotic retention of microbial necromass in soil
Sticky dead microbes: Rapid abiotic retention of microbial necromass in soil
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DOI：
10.1016/j.soilbio.2020.107929
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发表时间：
2020-10-01
影响因子：
9.7
通讯作者：
Ostle, Nick J.
中科院分区：
文献类型：
--
作者：
Buckeridge, Kate M.;La Rosa, Alfio Fabio;Ostle, Nick J.
土壤有机质以微生物坏死体为主。近年来，对坏死体与土壤碳储量的研究主要集中在坏死体的产生和稳定机制上，而对坏死体滞留机制的研究较少。我们提出了从土壤孵化稳定同位素标记的坏死块的证据，非生物吸附可能比生物固定化更重要的短期坏死块保留。我们证明，坏死块不仅可以吸附在矿物表面，还可以与其他坏死块相互作用。此外，坏死团细胞化学改变了坏死团-坏死团的相互作用，当存在酵母坏死团时，保留了更多的细菌示踪剂。这些发现表明，除化学稳定性外，微生物坏死体的吸附和非生物相互作用及其功能特性值得在土壤碳固定的背景下进行进一步的研究。
Microbial necromass dominates soil organic matter. Recent research on necromass and soil carbon storage has focused on necromass production and stabilization mechanisms but not on the mechanisms of necromass retention. We present evidence from soil incubations with stable-isotope labeled necromass that abiotic adsorption may be more important than biotic immobilization for short-term necromass retention. We demonstrate that necromass adsorbs not only to mineral surfaces, but may also interact with other necromass. Furthermore, necromass cell chemistry alters necromass-necromass interaction, with more bacterial tracer retained when there is yeast necromass present. These findings suggest that the adsorption and abiotic interaction of microbial necromass and its functional properties, beyond chemical stability, deserve further investigation in the context of soil carbon sequestration.