Relationships between plants and nitrogen-related microbes may vary with plant growth. We investigated these relationship dynamics for Dactylis glomerata cultures by analyzing plant functional traits (PFT) arbuscular mycorrhizal fungal (AMF) colonization, potential N mineralization (PNM), potential nitrification (PNA) and denitrification activities (PDA) over 3-months.. D. glomerata recruited AMF early in their growth, and maintained an active mycorrhizal symbiosis which may have contributed to plant nutrient acquisition over the 3-month period offsetting the decline in soil inorganic N. PFT changed concomitantly with this decline in fertility resulting in higher allocation to root biomass and higher root C:N ratio. In addition to root AMF presence, PFT changes may have favored PDA rather than PNM through changes in soil properties, particularly the quality of labile carbon soil fraction. Other PFT changes such as N uptake modified the abilities of plant to compete with bacterial groups implied in N cycling.
Legay, N., Clément, J-C., Grassein, F., Lavorel, S., Lemauviel-Lavenant , S., Personeni, E., ... Binet, M-N. (2020). Plant growth drives soil nitrogen cycling and N-related microbial activity through changing root traits
. Fungal Ecology
(April 2020), . https://doi.org/10.1016/j.funeco.2019.100910