数字农科院2.0

Fungal Necromass Carbon Dominates Global Soil Organic Carbon Storage

文献类型： 外文期刊

作者： Haoran Fu;Hong Chen;Zhengbo Ma;Guopeng Liang;David R. Chadwick;Davey L. Jones;Wolfgang Wanek;Lianghuan Wu;Qingxu Ma

作者机构：

关键词： bacterial necromass carbon;ecosystem;fungal necromass carbon;plant-derived carbon;soil organic carbon

期刊名称： Global Change Biology

ISSN： 1354-1013

年卷期： 2025 年 31 卷 8 期

页码：

收录情况： SCIE（2025版）

摘要： Soil organic carbon (C) is derived primarily from plant and microbial necromass; however, the global distribution and contribution of different necromass inputs to soil C storage remain unclear. We conducted a global meta-analysis encompassing 2410 observations from 249 microbial necromass studies and 786 observations from 72 plant residue studies. The results showed that the content of microbial-derived C (10.63 ± 0.39 g C kg−1 soil) exceeded that of plant-derived C (lignin phenol carbon (LPC), 5.63 ± 0.45 g C kg−1 soil), across the 0–100 cm soil profile, with fungal necromass carbon (FNC; 7.24 ± 0.21 g C kg−1) contributing the most to soil C—a pattern consistently observed across all depths. In addition, in the topsoil (0–20 cm), forests (9.39 ± 1.22 g C kg−1) and grasslands (9.73 ± 1.74 g C kg−1) showed significantly higher LPC contents than croplands and wetlands; therefore, cropland expansion significantly reduces microbial- and plant-derived carbon stocks in topsoil. Global FNC, BNC, and LPC stocks were estimated to be 211 Pg (95% CI: 156–270 Pg), 71 Pg (95% CI: 59–88 Pg) and 168 Pg (95% CI: 151–186 Pg) in topsoil, respectively. Lower soil pH and mean annual temperature were associated with higher FNC, BNC, and LPC contents, particularly in high-latitude regions like North America. These results demonstrate that microbial necromass, rather than plant residues, dominates soil C storage globally. These findings highlight the need for management strategies that address both land-use change and rising temperatures to protect microbial and plant C pools.

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