Environmental and microbial controls on microbial necromass recycling, an important precursor for soil carbon stabilization
Environmental and microbial controls on microbial necromass recycling, an important precursor for soil carbon stabilization
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DOI：
10.1038/s43247-020-00031-4
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发表时间：
2020-10-22
影响因子：
7.9
通讯作者：
Whitaker, Jeanette
中科院分区：
文献类型：
--
作者：
Buckeridge, Kate M.;Mason, Kelly E.;Whitaker, Jeanette
微生物坏死物质循环，这可能会影响土壤碳的稳定，是由微生物的生长和沉淀控制，如稳定同位素示踪和指示物种分析表明，在一系列英国grasse.There是一个新兴的共识，即微生物坏死物质碳是稳定的土壤碳的主要成分，但稳定过程中的控制是未知的。在稳定化之前，微生物坏死块可由微生物群落再循环。我们建议，这种循环的效率是土壤碳稳定率的关键决定因素。在这里，我们探讨了27个英国草原土壤中使用稳定同位素示踪和指示物种分析的控制坏死物质循环效率。我们发现回收效率不受土地管理的影响。相反，循环效率的增加与微生物的生长速度necromass，并在土壤中的历史降水量低的最高。我们确定了细菌和真菌指标的necromass循环效率，这可以用来澄清土壤碳稳定机制。我们的结论是，环境和微生物的控制有很强的影响，坏死物质循环，并建议，这反过来又影响土壤碳稳定。
Microbial necromass recycling, which can influence soil carbon stabilization, is controlled by microbial growth and precipitation, as indicated by stable isotope tracing and indicator species analysis in a range of UK grasslands.There is an emerging consensus that microbial necromass carbon is the primary constituent of stable soil carbon, yet the controls on the stabilization process are unknown. Prior to stabilization, microbial necromass may be recycled by the microbial community. We propose that the efficiency of this recycling is a critical determinant of soil carbon stabilization rates. Here we explore the controls on necromass recycling efficiency in 27 UK grassland soils using stable isotope tracing and indicator species analysis. We found that recycling efficiency was unaffected by land management. Instead, recycling efficiency increased with microbial growth rate on necromass, and was highest in soils with low historical precipitation. We identified bacterial and fungal indicators of necromass recycling efficiency, which could be used to clarify soil carbon stabilization mechanisms. We conclude that environmental and microbial controls have a strong influence on necromass recycling, and suggest that this, in turn, influences soil carbon stabilization.