Notes on the phenology of fungi in ombrotrophic bog

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Abstract

Observations of fungal fruiting and micro-climate were done during a two-year time period in bog habitats near Khanty-Mansiysk town (middle taiga of West Siberia). Air and soil profile temperature regimes of two bog habitats (treed bog, sphagnum lawn) were compared to forest one. Precipitation was measured in one location at the bog (during two years of observations). Fruiting of larger fungi was recorded in 2013 by counting at plots placed in two bog communities (additional information on fruiting was collected in 2012 by random sampling). Quantitative registrations of larger fungi were done only in August-September, the time of abundant fruiting. Sporocarp abundance was growing during this period and reached its maximum in the middle of September for both years. Mean number of species at plots was remaining constant (totally fruiting of 59 species observed). Earlier fruiting of larger fungi at bogs was scarce, four species were noticed with earlier appearance. Microfungi on plant litter were observed during the entire vegetation season in 2013. Periodicity in fruiting of 40 species was registered. The three studied habitats differ in micro-climates in spite of their geographical proximity. The bogs have highest daily amplitude and temperature range within the 0-5 cm layer. Soil surface in treed bogs is more subjected to frosts, lawn has lower number of frost hours at the surface and forest has intermediate position. The longevity of the vegetation period (period with temperatures >5°) at the surface is the shortest in treed bog but at 5 cm depth is the shortest in forest. Fungi settled in the litter (0-5 cm) experience more extreme climatic conditions in the treed bog environment and, to a lesser extent in the lawn habitat. The fruiting pattern registered in 2013 at Mukhrino bog seems to be corresponding to autumn downshift mean soil and minimum air temperatures. The influence of precipitation on fruiting was not very pronounced.

About the authors

Nina Vladimirovna Filippova

Yugra State University, Khanty-Mansiysk, Russia

Author for correspondence.
Email: filippova.coulee.nina@gmail.com

Aurélien Mourgues

University of Grenoble 1, Institute of Alpine Geography, France

Email: filippova.coulee.nina@gmail.com

Felix Philippe

University of Grenoble 1, Institute of Alpine Geography, France

Email: filippova.coulee.nina@gmail.com

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Copyright (c) 2014 Filippova N.V., Mourgues A., Philippe F.

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