| Abstract [eng] |
Variegated Horesatal's (Equisetum variegatum Schleicher) in Lithuania: Distribution and populiation's Structure in Deserted Quary of Sand SUMMARY The distribution and the structure of the populations of Variegated Horsetail (E. variegatum) have been researched in the sand quarry during the year 2008. The common incidence in the Beržupis quarry has been researched through the years 2005-2006. On the strength of the data provided in the special literature it was determined that there were no special researches of the E. variegatum distribution and structure of the populations neither in Europe nor somewhere else in the world. The analysis of the labels of E. variegatu‘s herbarium examples has shown that this horsetail thrive in the anthropogenical places. The amplitude of the ecological radius of E. variegatum in the quarry inspected are much wider than in the natural growing environments of E. variegatum. In the natural groing places this horsetail usually tends to act as a mezofits or mezohigrofits, whereas in the abandoned quarry as kserofits, mezofits, higrofits or even hidrofits.The essential elements of the E. variegatum‘s population are polynomial bush which are made out of sterile, fertil and out of the sprouts of unclear status. In the inspected population E. Variegatum’s bush usually were composed out of the 2-4 sterile or fertile sprouts. The greatest participation of the fertils sprouts in the composition of bush is characteristic to the growing place with open sands. The sporefication of the E. variegatum in the growing places of shallow waters is of the extremely low level. There are first year, second year and elder sprouts in the composition of the E. variegatum bush. The first year and the second year sprouts are more common in the bushes. The yeang sprouts can be find in the composition of the bushes mostuly on the southly oriented slope of the Beržupis quarry in the lower part of cenopopulation. The structure of the cenopopulations of E. variegatum was almost identical in almost all of the inspected areas in the quarry. The essential differences between cenopopulations are contained in the quantity of the bushes and the proportion of the sterile and fertile sprouts‘ proportion. Among the morphological features the most significant difference is in the height of the sprouts. In the inspected growing places on a overland the minimal height of the second year sprouts is approximately 3-4 cm, maximal – 20 -25 cm. The maximal height of the E. variegatum‘s sprouts in the water is 38-40 cm. |
