Microbial residues may make a more significant contribution to soil organic carbon (SOC) than traditionally believed. However, little is known about the accumulation characteristics of fungal and bacterial residues and their contribution to SOC in salt-affected soils. We investigated changes in fungal and bacterial residues using amino sugar biomarkers along a salinity gradient in coastal salt-affected soils. As salinity increased, the content of fungal residue decreased from 337.6 to 111.6 mg kg⁻¹, while the bacterial counterpart increased from 62.5 to 142.4 mg kg⁻¹. The contribution of microbial residues to SOC was salinity-dependent. There was an increase for microbial residue contribution to SOC and a shift from fungal to bacterial residue dominated contribution to SOC with increasing salinity. Hence, salinization had a significant impact on microbial-mediated SOC accumulation.

微生物残留对土壤有机碳（SOC）的贡献可能比传统上认为的要大。但是，关于盐分土壤中真菌和细菌残留物的积累特性及其对SOC的贡献知之甚少。我们调查了沿沿海盐碱化土壤中盐度梯度使用氨基糖生物标志物在真菌和细菌残留中的变化。随着盐度的增加，真菌残留物的含量从337.6降至111.6 mg kg ^-1，而细菌对应物从62.5升高至142.4 mg kg ^-1。。微生物残留对SOC的贡献取决于盐度。随着盐度的增加，微生物残留对SOC的贡献增加，并且从真菌残留转变为细菌残留对SOC的贡献占主导。因此，盐碱化对微生物介导的SOC积累具有重大影响。