Plant growth drives soil nitrogen cycling and N-related microbial activity through changing root traits

Nicolas Legay, Jean-Christophe Clément, Fabrice Grassein, Sandra Lavorel, S Lemauviel-Lavenant , Eleanor Personeni, Frank Poly, T Pommier, Thomas Matthew Robson, B Mouhamadou , M-N Binet

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Relationships between plants and nitrogen-related microbes may vary with plant growth. We investigated these dynamic relationships over three months by analyzing plant functional traits (PFT), arbuscular mycorrhizal fungal (AMF) colonization, potential N mineralization (PNM), potential nitrification (PNA) and denitrification activities (PDA) in Dactylis glomerata cultures. D. glomerata recruited AMF during early growth, and thereafter maintained a constant root colonization intensity. This may have permitted high enough plant nutrient acquisition over the three months as to offset reduced soil inorganic N. PFT changed with plant age and declining soil fertility, resulting in higher allocation to root biomass and higher root C:N ratio. Additional to root AMF presence, PR' changes may have favored denitrification over mineralization through changes in soil properties, particularly increasing the quality of the labile carbon soil fraction. Other PFT changes, such as N uptake, modified the plants' ability to compete with bacterial groups involved in N cycling. (C) 2020 Elsevier Ltd and British Mycological Society. All rights reserved.

TidskriftFungal Ecology
UtgåvaApril 2020
Antal sidor12
StatusPublicerad - apr 2020
MoE-publikationstypA1 Tidskriftsartikel-refererad


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Legay, N., Clément, J-C., Grassein, F., Lavorel, S., Lemauviel-Lavenant , S., Personeni, E., Poly, F., Pommier, T., Robson, T. M., Mouhamadou , B., & Binet, M-N. (2020). Plant growth drives soil nitrogen cycling and N-related microbial activity through changing root traits. Fungal Ecology, 44(April 2020), [100910].