Abstract
Total number of fruit bodies of Dermocybe uliginosa produced during the fruiting period, the rate of production and the length of the fruiting period were correlated with various micrometeorological factors. The number of fruit bodies produced per season (fruiting performance) depended mainly on the length of the fruiting period. This, in turn, depended on the fall of daily minimum air temperature immediately above soil surface (Tmin) below the critical level of 5·5 °C during the fruiting period. Short falls of Tmin ( < 3 d) increased while longer falls ( > 3 d) diminished or stopped the fruiting. The rate of production of new fruit bodies was most closely correlated with the daily mean and minimum air temperature, soil temperature and water-vapour pressure integrated for the immediately preceding 5 d. The rate of desiccation of the fruit bodies was most closely correlated with soil surface temperature and soil temperature at 0·05 m depth, again integrated for the immediately preceding 5 d. The possibility of using the total number of fruit bodies produced per fruiting period for estimating fruit body biomass production is discussed.
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