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

Blanke, Verena; Wagner, Markus; Renker, Carsten; Lippert, Hannelore; Michulitz, Manfred; Kuhn, Arnd J.; Buscot, Francois. 2011 Arbuscular mycorrhizas in phosphate-polluted soil: interrelations between root colonization and nitrogen. Plant and Soil, 343. 379-392. 10.1007/s11104-011-0727-9

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Abstract/Summary

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 froma mycorrhiza-mediated N uptake and accordingly, N distribution.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1007/s11104-011-0727-9
Programmes: CEH Topics & Objectives 2009 - 2012 > Biodiversity > BD Topic 2 - Ecological Processes in the Environment > BD - 2.1 - Interactions ... structure ecosystems and their functioning
CEH Sections: Pywell
ISSN: 0032-079X
Additional Information. Not used in RCUK Gateway to Research.: The original publication is available at www.springerlink.com
Additional Keywords: arbuscular mycorrhiza, benomyl, element concentrations, nitrogen fertilization, phosphate pollution, root colonization
NORA Subject Terms: Botany
Agriculture and Soil Science
Biology and Microbiology
Ecology and Environment
Date made live: 03 Oct 2011 09:38
URI: http://nora.nerc.ac.uk/id/eprint/15209

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