Regular Article

Plant and Soil

, Volume 343, Issue 1, pp 379-392

Arbuscular mycorrhizas in phosphate-polluted soil: interrelations between root colonization and nitrogen

  • Verena BlankeAffiliated withInstitute of Ecology, Friedrich-Schiller-University JenaDepartment of Soil Ecology, UFZ - Helmholtz Centre for Environmental ResearchAgroscope Reckenholz-Tänikon Research Station ART, Air Pollution/Climate Group Email author 
  • , Markus WagnerAffiliated withNERC Centre for Ecology & Hydrology
  • , Carsten RenkerAffiliated withDepartment of Soil Ecology, UFZ - Helmholtz Centre for Environmental ResearchNatural History Museum Mainz
  • , Hannelore LippertAffiliated withCentral Division of Analytical Chemistry (ZCH), Research Centre Jülich
  • , Manfred MichulitzAffiliated withCentral Division of Analytical Chemistry (ZCH), Research Centre Jülich
  • , Arnd J. KuhnAffiliated withInstitute for Phytosphere Research (ICG-3), Research Centre Jülich
  • , François BuscotAffiliated withDepartment of Soil Ecology, UFZ - Helmholtz Centre for Environmental ResearchInstitute of Biology, Chair of Soil Ecology, University of Leipzig

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Abstract

To investigate whether arbuscular mycorrhizal fungi (AMF) – abundant in a phosphate-polluted but nitrogen-poor field site – improve plant N nutrition, we carried out a two-factorial experiment, including N fertilization and fungicide treatment. Percentage of root length colonized (% RLC) by AMF and tissue element concentrations were determined for four resident plant species. Furthermore, soil nutrient levels and N effects on aboveground biomass of individual species were measured. Nitrogen fertilization lowered % RLC by AMF of Artemisia vulgaris L., Picris hieracioides L. and Poa compressa L., but not of Bromus japonicus Thunb. This – together with positive N addition effects on N status, N:P-ratio and aboveground biomass of most species – suggested that plants are mycorrhizal because of N deficiency. Fungicide treatment, which reduced % RLC in all species, resulted in lower N concentrations in A. vulgaris and P. hieracioides, a higher N concentration in P. compressa, and did not consistently affect N status of B. japonicus. Evidently, AMF had an influence on the N nutrition of plants in this P-rich soil; however – potentially due to differences in their mycorrhizal responsiveness – not all species seemed to benefit from a mycorrhiza-mediated N uptake and accordingly, N distribution.

Keywords

Arbuscular mycorrhiza Benomyl Element concentrations Nitrogen fertilization Phosphate pollution Root colonization