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Responses of ectomycorrhizal fungi to mineral substrates

Rosling, Anna (2003). Responses of ectomycorrhizal fungi to mineral substrates. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae. Silvestria, 1401-6230 ; 296
ISBN 91-576-6530-3
[Doctoral thesis]

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Boreal forest soils are complex, heterogeneous growth substrates where organic and mineral components provide nutrient resources for soil organisms and plants. Mineral nutrients are cycled between living and dead organic components of the forest soil and weathering of soil minerals provides an important input of new resources, compensating for losses from the ecosystem. Predicting soil responses to changing climate and management practices is important to determine their effect on forest production. Models for this purpose are largely based on the concept of the soil solution as the interface controlling soil processes such as weathering and nutrient uptake by plants, whereas soil microbiology recognises microbial processes as the driving force in soil nutrient cycling. In boreal forests most tree root tips are colonised by ectomycorrhizal fungi. The mycelia of these symbiotic fungi mediate nutrient uptake by their tree hosts. These fungi are abundant in the organic layer of forest soils and ectomycorrhizal research has therefore largely focused on nutrient uptake from this horizon. Minerals in the soil may, however, also serve as nutrient resources for ectomycorrhizal fungi. Through combined chemical and physical processes fungi can affect nutrient availability by weathering minerals. This thesis describes a field experiment investigating the distribution of different ectomycorrhizal fungi in organic and mineral forest soil horizons, in vitro studies of fungal acidification of artificial substrates with different mineral element composition, microcosm studies of growth and carbon allocation in intact ectomycorrhizal systems colonising heterogeneous mineral substrates and a preliminary investigation of changes in surface micro-topography of minerals colonised by ectomycorrhizal hyphae. Half of the fungal species identified in the forest soil occurred exclusively in the mineral horizons. Mycelial growth, carbon allocation and substrate acidification by fungi colonising different mineral substrates in vitro and in microcosms appeared to be influenced by mineral element composition. Interpretation of possible modification of mineral surface micro-topography is more difficult but together the results obtained suggest that ectomycorrhizal fungi may contribute to the development of microenvironments on colonised mineral surfaces, where increased weathering can take place. Processes regulating nutrient availability in such microenvironments are different from those estimated from the bulk soil solution.

Authors/Creators:Rosling, Anna
Title:Responses of ectomycorrhizal fungi to mineral substrates
Series Name/Journal:Acta Universitatis Agriculturae Sueciae. Silvestria
Year of publishing :December 2003
Number of Pages:65
ALLI. Rosling A, Landeweert R, Lindahl BD, Larsson K-H, Kuyper TW, Taylor AFS & Finlay RD (2003) Vertical distribution of ectomycorrhizal fungal taxa in a podzol soil profile. New Phytologist 159, 775 - 783. II. Rosling A, Lindahl BD & Finlay RD (0000) Carbon allocation to ectomycorrhizal roots and mycelium colonising different mineral substrates. Submitted to New Phytologist. III. Rosling A, Lindahl BD, Taylor AFS & Finlay RD (2003) Mycelial growth and substrate acidification of ectomycorrhizal fungi in response to different minerals. FEMS Microbiology Ecology (In Press) IV. Rosling A, Daniel G, Unestam T & Finlay RD (0000) Alteration of micro-topography of calcite marble surfaces as a result of ectomycorrhizal hyphal growth. Submitted to Canadian Journal of Microbiology.
Place of Publication:Uppsala
ISBN for printed version:91-576-6530-3
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:P Natural resources > P34 Soil biology
Subjects:Not in use, please see Agris categories
Agrovoc terms:radiography, tracer techniques, hebeloma, pinus sylvestris, podzols, potassium, microscopy, quartz, soil microorganisms
Keywords:autoradiography, calcite marble, Hebeloma crustuliniforme, Piloderma fallax, Pinus sylvestris, podzol, potassium feldspar, scanning electron microscopy, quartz
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ID Code:404
Department:(S) > Institutionen för skoglig mykologi och patologi
Deposited By: Anna Rosling
Deposited On:01 Dec 2003 00:00
Metadata Last Modified:26 Apr 2019 10:20

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