Linking effect traits of soil fauna to processes of organic mattertransformation

Bonfanti Jonathan, Potapov Anton M., Angst Gerrit, Ganault Pierre, Briones Maria J. I., Calderon-Sanou Irene, Chen Ting-Wen, Conti Erminia, Degrune Florine, Eisenhauer Nico, Ferlian Olga, Hackenberger Davorka K., Hauer Amelie, Hedde Mickaël, Hohberg Karin, Krogh Paul Henning, Mulder Christian, Perez-Roig Camila, Russell David J., Shelef Oren, Zhou Zheng, Zuev Andrey G., Berg Matty P.. 2025. Linking effect traits of soil fauna to processes of organic mattertransformation. Functional Ecology, 39 (2) : 446-461.

https://doi.org/10.1111/1365-2435.14720

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Résumé : Soil organic matter (SOM) transformation processes are regulated by the activities of plants, microbes, and fauna. Compared with plants and microbes, effects of soil fauna are less understood because of their high taxonomic and functional diversity, and mix of direct and indirect effect mechanisms. Trait-based approaches offer a generic perspective to quantify mechanistic relationships between soil fauna and SOM transformations, including decomposition, translocation, and stabilisation of organic carbon. Yet, at present, we lack a consensus concerning relevant key effect traits of soil fauna (i.e. those affecting ecosystem functioning). Here, we address this knowledge gap by focusing on relationships between soil fauna effect traits and SOM transformations. Based on existing literature, we identify key processes linked to SOM transformations, and fauna effect traits universally applicable across taxa and soil types, and discuss the process-trait links. We define eight SOM transformation processes that are directly affected by soil fauna: (i) litter mass loss, (ii) litter fragmentation, (iii) SOM aggregation in faeces, (iv) SOM aggregation in soil mineral particles, (v) decomposition of faeces, (vi) SOM and mineral translocation, (vii) pore space creation and maintenance and (viii) SOM stabilisation. We link these processes to general effect traits classified into four categories: (a) food selection and ingestion, (b), digestion and excretion, (c) mobility, and (d) body mass and metabolic rate. We also propose proxies when effect trait measurements are laborious. The proposed links between effect traits and SOM transformation processes need to be validated in targeted experiments. We urge researchers to obtain quantitative experimental data, together with metabolic approaches, to integratively quantify soil fauna contributions to soil functioning.

Mots-clés Agrovoc : faune du sol, matière organique du sol, faune, fèces, litière végétale, propriété physicochimique du sol, ver de terre, culture en mélange, Invertébré

Mots-clés libres : Bioturbation, Decomposition, Ecosystem functioning, Faeces, Functional traits, Litter fragmentation, Metabolic rate, Stabilisation

Agences de financement européennes : European Commission

Projets sur financement : (EU) ANIHWA CALL1:Improved Understanding of Epidemiology of PPR

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