@article{fdi:010071421,
  title = {{M}odelling facilitation or competition within a root system: importance of the overlap of root depletion and accumulation zones},
  author = {de {P}arseval, {H}. and {B}arot, {S}{\'e}bastien and {G}ignoux, {J}. and {L}ata, {J}. {C}. and {R}aynaud, {X}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he concept of intra-plant, inter-root competition considers the overlap of nutrient depletion zones around roots, but neglects the spatial pattern of root exudates that can increase nutrient availability. {W}e tested the hypothesis that interactions between nutrient accumulation zones due to exudation by different roots can lead to intra-plant inter-root facilitation. {W}e used the {PARIS} model ({R}aynaud et al. 2008) to simulate phosphorus uptake by a population of roots that are able to increase phosphorus availability by exuding citrate. {W}e carried out several simulations with the same parameters but with increasing root density in order to study out if changes in root densities would alter nutrient uptake per unit root. {E}merging relationships between root uptake efficiency and root length density indicated cases of inter-root competition or facilitation. {T}he sizes of the accumulation and depletion zones were calculated to explain these results. {O}ur simulations showed a continuum between cases of inter-root competition and facilitation. {F}acilitation occurred at low exudation rates, when phosphorus supply was not saturated within the phosphorus depletion zone surrounding roots. {L}ow exudation systems led to a lower phosphorus uptake per unit root length, but minimized phosphorus losses in the process. {B}ased on our model, we derived conditions that allowed predicting whether competition, facilitation or no interaction, is the dominant interaction between roots within a root system, based on the different distances to which an isolated root alters {P} concentration and supply.},
  keywords = {{D}iffusion ; {E}xudation ; {M}odelling ; {P}hosphorus ; {R}hizosphere ; {S}patial distribution},
  booktitle = {},
  journal = {{P}lant and {S}oil},
  volume = {419},
  numero = {1-2},
  pages = {97--111},
  ISSN = {0032-079{X}},
  year = {2017},
  DOI = {10.1007/s11104-017-3321-y},
  URL = {https://www.documentation.ird.fr/hor/fdi:010071421},
}