Ananyev V., Zaitseva N.
Dynamics of the ground vegetation in long-drained pine stands
// Biodiversity of Fennoscandia (diversity, human impact, nature conservation). Petrozavodsk: Karelian Research Centre of RAS, 1997.
Drainage, like other forest management activities, indirectly affects the ground vegetation through changed abiotic factors and dynamics in the upper storey structure. Researchers mainly investigate the dynamics of the ground vegetation for the period of 10-20 years after drainage, while such data for longer periods are practically non-available.

The object of our research is long-drained (as long as 60 years) pine stands located in the Lyaskelya forestry, Sortavala forestry enterprise, and growing in humus-peat soil. The peat layer is 1.5 m thick. The peat is well-decomposed (decomposition stage is 25% and higher), rich in ashy elements. Drainage was intensive with the 80-metre distance between the ditches.

During research work, spruce stands had the following dendremetrical values: composition - 6S150, 4S100, individual P170; bulk density - 1.3; growing stock - 310 m(/ha.

Ground vegetation species composition varies greatly. So, the total number of species in the grassy - brushwood zone grew, for the past 10 years, from 9 to 12 species. Goodyera repens (L.) R.Br., Lycopodium annotium L., disappeared, but new species appeared: Lechenfeldia flexuosa (L.) Scur., Linnea borealis L., Paris quadrifolia L., Melampyrum sylvaticum L. Such typical for bilberry - spruce stands species as: Vaccinium myrtillus L., V. vitis-idaea L., Mainthemum bifolium (L.) F. W. Schimidt, Trientalis european L., are noted for high viability and bear fruit. For the 10-year period, values for their projective cover and occurrence grew considerably. After drainage, grassy - sphagnum spruce stand may have naturally succeeded, through the stage of bilberry-sphagnum spruce stands, by bilberry spruce stands. This is likely to be an adaptive response to the changed environment.
Последние изменения: 31 мая 2012