Logo image
Back
Fungal necromass contribution to carbon sequestration in global croplands: A meta-analysis of driving factors and conservation practices
Journal article   Peer reviewed

Fungal necromass contribution to carbon sequestration in global croplands: A meta-analysis of driving factors and conservation practices

Dong Liu, Ziyan Zhou, Shahid Iqbal, Ting Ting Dou, Gregory Bonito, Wei Liu, Shaoshan An, Caspar C.C. Chater, Jesus Perez-Moreno, Rongxiao Che, …
The Science of the total environment, Vol.949, 174954
2024
DOI: https://doi.org/10.1016/j.scitotenv.2024.174954
pdf
Pre-proof1.63 MB
Embargoed Access, Embargo ends: 31/07/2026

Abstract

Arable lands Carbon sequestration Microbial biomass Necromass Soil properties, land use management
Fungal necromass carbon (FNC) contributes significantly to the build-up of soil organic carbon (SOC) by supplying abundant recalcitrant polymeric melanin present in the fungal cell wall. However, the influence of a wide range of conservation practices and associated factors on FNC accumulation and contribution to SOC in global croplands remains unexplored. Here, a meta-analysis was performed using 873 observations across three continents, together with structural equation modeling, to evaluate conservation practices and factors responsible for the enhancement of FNC and SOC. FNC content (8.39 g kg−1) of North American soils was highest compared to FNC content of Asian and European soils. The structural equation models showed a significant (p < 0.05) positive influence of microbial biomass carbon (MBC), soil pH, and clay contents on the accumulation of FNC. Soil C/N ratio and climate factors, however, had only minor influences on FNC accumulation. Notably, the main driver of FNC was MBC, which is mainly influenced by the soil total N and geographic factors in the study areas. Typical 5 cropland practices had significant effect size (p < 0.05) on FNC, leading to an increase of 12 % to 26 %, and the FNC content was greatest under straw amendment (26 %). Fungal necromass accumulation efficiency ranged from 23 % to 45 % depending on cropland practices: non- and reduced tillage was the most efficient (45 %), followed by crop coverage (32 %), straw amendment (30 %), and manure application (27 %), while N fertilization had the lowest efficiency (23 %). We conclude that FNC contributes to over a quarter of SOC, highlighting its major role in enhancing C sequestration worldwide. Conservation practices, particularly non-tillage or reduced tillage, are important to enhance C sequestration from FNC in croplands. [Display omitted]

Details

Metrics

41 Record Views
Logo image