РОСТ И НАКОПЛЕНИЕ МАССЫ POLYTRICHUM COMMUNE В ЛЕСНОМ ПОЯСЕ ХИБИН
GROWTH AND MASS ACCUMULATION OF POLYTRICHUM COMMUNE IN KHIBINY MOUNTAINS FOREST BELT

Summary/Abstract: The productivity (linear and weight increments) of Polytrichum commune in Khibiny mountains forest belt is estimated. The annual increment in 2013–2016, depending on the habitat, amounted to 30–46 mm/year and to 11–23 mg/year in dry mass. The length and the mass increments are the largest in the forest meadow. The linear and the weight increments during vegetation periods occur simultaneously but at different rates. A period with the ultimate growth rate can occur at any time of the growing season and depends on the temperature regime at the beginning of the vegetation period. It was revealed that the transition to this period was noted after the accumulation of a certain effective temperature sum. A high growth rate of the stem was observed at the air temperature of 11–18 °C and precipitations of 0,5–2,5 mm per day. At the end of August the linear growth of the plant slowed down. The autumn growth processes are connected with the increasing mass increment;

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