Does the sequence of plant dominants affect mycorrhiza development in simulated succession on spoil banks? |
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Authors: | David Püschel Jana Rydlová Miroslav Vosátka |
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Institution: | (1) Department of Mycorrhizal Symbioses, Institute of Botany, Academy of Sciences of the Czech Republic, 252 43 Pruhonice, Czech Republic |
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Abstract: | The aim of this field study was to examine how the development of arbuscular mycorrhizal fungi (AMF) on coal mine spoil banks
is affected by the presence of plants with different mycorrhizal status. A 3-year trial was conducted on the freshly created
spoil bank Vršany, North-Bohemian coal basin, the Czech Republic. Three plant species – non-mycotrophic annual Atriplex sagittata, highly mycotrophic annual Tripleurospermum inodorum (both dominants of early stages of succession) and facultatively mycotrophic Arrhenatherum elatius (a perennial grass species of the later stage of succession) – were planted on 1 m2 plots over 3 years in different sequences that simulated the progress of succession on spoil banks. The development of AMF
populations was monitored by evaluation of mycorrhizal colonization of plant roots and by measurement of the mycorrhizal inoculation
potential (MIP) of soil. These two parameters were compared between plots inoculated with the mixture of three AMF isolates
– Glomus mosseae BEG95, G. claroideum BEG96 and G. intraradices BEG140 – (“inoculated plots”) and plots exposed only to natural dispersal of AMF propagules (“uninoculated plots”). Highly
colonized roots of plants together with a high MIP of soil in uninoculated plots were already found at the end of the first
season, indicating rapid natural dispersal of AMF propagules. Root colonization of facultatively mycotrophic and non-mycotrophic
plants in later years was affected by the mycorrhizal status of the previous plant species. The MIP of soil continuously increased
throughout the experiment; in uninoculated plots, the MIP was temporarily decreased if plant species of higher mycotrophy
were replaced by species of lower mycotrophy. The results lead to the conclusion that AMF colonize freshly formed sites very
quickly and reproduce or accumulate in the soil, which leads to increasing MIP values. However, this infective potential can
be decreased if non-mycotrophic plants predominate on the site. |
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Keywords: | Arbuscular mycorrhizal fungi Colonisation Dispersal Mycorrhizal inoculation potential Propagules |
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