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Quantitative assessment of microbial necromass contribution to soil organic matter

Liang, Chao ; Amelung, Wulf ; Lehmann, Johannes ; Kästner, Matthias

Global change biology, 2019-11, Vol.25 (11), p.3578-3590 [Periódico revisado por pares]

England: Blackwell Publishing Ltd

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Título:
Quantitative assessment of microbial necromass contribution to soil organic matter
Autor: Liang, Chao ; Amelung, Wulf ; Lehmann, Johannes ; Kästner, Matthias
Assuntos: Agricultural ecosystems ; Agricultural management ; amino sugar ; Biomarkers ; Biomass ; Carbon ; Climate change ; Climate change mitigation ; Climate models ; Ecosystem ; ecosystem sustainability ; Ecosystems ; Environmental changes ; Forest ecosystems ; Grasslands ; microbial anabolism ; microbial biomarker ; microbial residue ; Microorganisms ; Nitrogen ; Organic carbon ; Organic matter ; Organic soils ; Preservation ; Quantitation ; Saccharides ; Scaling ; Soil ; Soil Microbiology ; soil organic carbon ; Soil organic matter ; Soils ; Stoichiometry ; Sugar ; Terrestrial ecosystems ; Topsoil ; Transformation ; Uncertainty
É parte de: Global change biology, 2019-11, Vol.25 (11), p.3578-3590
Descrição: Soil carbon transformation and sequestration have received significant interest in recent years due to a growing need for quantitating its role in mitigating climate change. Even though our understanding of the nature of soil organic matter has recently been substantially revised, fundamental uncertainty remains about the quantitative importance of microbial necromass as part of persistent organic matter. Addressing this uncertainty has been hampered by the absence of quantitative assessments whether microbial matter makes up the majority of the persistent carbon in soil. Direct quantitation of microbial necromass in soil is very challenging because of an overlapping molecular signature with nonmicrobial organic carbon. Here, we use a comprehensive analysis of existing biomarker amino sugar data published between 1996 and 2018, combined with novel appropriation using an ecological systems approach, elemental carbon–nitrogen stoichiometry, and biomarker scaling, to demonstrate a suit of strategies for quantitating the contribution of microbe‐derived carbon to the topsoil organic carbon reservoir in global temperate agricultural, grassland, and forest ecosystems. We show that microbial necromass can make up more than half of soil organic carbon. Hence, we suggest that next‐generation field management requires promoting microbial biomass formation and necromass preservation to maintain healthy soils, ecosystems, and climate. Our analyses have important implications for improving current climate and carbon models, and helping develop management practices and policies. We reprocessed existing amino sugar data, published between 1996 and 2018 from global agricultural, grassland, and forest ecosystems in temperate zones, by scaling them up to microbial necromass carbon. On average, microbial necromass abundance increased in the order agricultural < grassland < forest, while its contribution to soil organic carbon (SOC) storage was lowest in the forest ecosystem. Fungal necromass abundance and its contribution to SOC were consistently higher than bacterial necromass. Microbial necromass can make up more than half of SOC pool, suggesting the need to understand microbial necromass conservation in the context of soil management and climate change mitigation.
Editor: England: Blackwell Publishing Ltd
Idioma: Inglês

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Quantitative assessment of microbial necromass contribution to soil organic matter

Liang, Chao ; Amelung, Wulf ; Lehmann, Johannes ; Kästner, Matthias

England: Blackwell Publishing Ltd

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