Fungal necromass contribution to carbon sequestration in global croplands: A meta-analysis of driving factors and conservation practices
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In: Science of the Total Environment, Vol. 949, 01.11.2024, p. 174954.
Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Fungal necromass contribution to carbon sequestration in global croplands
T2 - A meta-analysis of driving factors and conservation practices
AU - Liu, Dong
AU - Zhou, Ziyan
AU - Iqbal, Shahid
AU - Dou, Ting Ting
AU - Bonito, Gregory
AU - Liu, Wei
AU - An, Shaoshan
AU - Chater, Caspar C C
AU - Perez-Moreno, Jesus
AU - Che, Rongxiao
AU - Jones, Davey L
AU - Yu, Fuqiang
N1 - Copyright © 2024 Elsevier B.V. All rights reserved.
PY - 2024/11/1
Y1 - 2024/11/1
N2 - 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.
AB - 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.
KW - Carbon Sequestration
KW - Soil/chemistry
KW - Fungi
KW - Agriculture
KW - Conservation of Natural Resources
KW - Carbon/analysis
KW - Soil Microbiology
KW - Crops, Agricultural
U2 - 10.1016/j.scitotenv.2024.174954
DO - 10.1016/j.scitotenv.2024.174954
M3 - Article
C2 - 39067597
VL - 949
SP - 174954
JO - Science of the Total Environment
JF - Science of the Total Environment
SN - 0048-9697
ER -