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Purpose <p>To elucidate the successional mechanisms governing microbial necromass transformation, translocation, and stabilization within the soil aggregate hierarchy.</p> Methods <p>This study utilized a 33-year reclamation chronosequence on Pingshuo coal mine spoil in the Loess Plateau, China, combining physical soil fractionation with a dual-biomarker approach to concurrently analyze soil aggregate distribution, SOC, living microbial biomass (via phospholipid fatty acids, PLFAs), and microbial necromass (via amino sugar biomarkers) across the aggregate hierarchy.</p> Results <p>Reclamation drove a substantial soil structural reorganization, with the proportion of large macroaggregates (&gt; 2000&#xa0;µm) increasing from 26% to 47%. These newly-formed macroaggregates acted as persistent hotspots, concentrating the highest levels of SOC, biomass, and necromass. The efficiency of microbial necromass accumulation followed a non-linear trajectory, peaking at an intermediate successional stage (10&#xa0;years) before declining. This dynamic contrasted with the relative stability of the living microbial community, revealing a decoupling between the necromass pool and its living source. Furthermore, microbial necromass exhibited divergent fates: bacterial necromass was progressively translocated from macroaggregates and archived via physicochemical stabilization within the microaggregate fraction, while fungal necromass was predominantly processed and recycled in-situ within macroaggregates.</p> Conclusions <p>The divergent stabilization of microbial groups—fungal in-situ recycling versus bacterial mineral archiving—decisively drives SOC sequestration. This highlights that the post-mortem fate of necromass, rather than its initial production, governs long-term C persistence in recovering ecosystems.</p>

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Divergent pathways of fungal and bacterial necromass stabilization across a developing aggregate hierarchy drive soil carbon sequestration after severe disturbance

  • 期刊论文

  • 发表日期：

    2026年5月30日

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  • Ye Yuan,
  • Jiayu Zhao,
  • Yuan Yuan,
  • Qian Li,
  • Shuang Wang,
  • Mengyi Li

摘要

Purpose

To elucidate the successional mechanisms governing microbial necromass transformation, translocation, and stabilization within the soil aggregate hierarchy.

Methods

This study utilized a 33-year reclamation chronosequence on Pingshuo coal mine spoil in the Loess Plateau, China, combining physical soil fractionation with a dual-biomarker approach to concurrently analyze soil aggregate distribution, SOC, living microbial biomass (via phospholipid fatty acids, PLFAs), and microbial necromass (via amino sugar biomarkers) across the aggregate hierarchy.

Results

Reclamation drove a substantial soil structural reorganization, with the proportion of large macroaggregates (> 2000 µm) increasing from 26% to 47%. These newly-formed macroaggregates acted as persistent hotspots, concentrating the highest levels of SOC, biomass, and necromass. The efficiency of microbial necromass accumulation followed a non-linear trajectory, peaking at an intermediate successional stage (10 years) before declining. This dynamic contrasted with the relative stability of the living microbial community, revealing a decoupling between the necromass pool and its living source. Furthermore, microbial necromass exhibited divergent fates: bacterial necromass was progressively translocated from macroaggregates and archived via physicochemical stabilization within the microaggregate fraction, while fungal necromass was predominantly processed and recycled in-situ within macroaggregates.

Conclusions

The divergent stabilization of microbial groups—fungal in-situ recycling versus bacterial mineral archiving—decisively drives SOC sequestration. This highlights that the post-mortem fate of necromass, rather than its initial production, governs long-term C persistence in recovering ecosystems.