Sumedėjusios augalijos pasiskirstymas reguliuotuose upeliuose vykstant natūralizacijos procesams

Abstract

The paper analyzes quantitative changes of regulated streams overgrown with woody vegetation as well as deals with the possibilities to design the naturalization processes of regulated streams. The studies carried out in the Baltic Highland in the river Neris basin have shown that in the strips of the regulated stream slopes within the study area the most dominant species of trees were sallow (Salix caprea) observed in 25 (22,7 %) habitats, white alder (Alnus incana) and black alder (Alnus glutinosa) observed in 22 (20,0 %) and 16 (14,5 %) habitats respectively. Black willow (Salix myrsinifolia) and grey willow (Salix cineria) found in 15 (14,3 %) and 47 (42,47 %) habitats respectively are considered to be the most dominant of all the species of bushes. A particularly strong dependence (correlation coefficients r = 0,91 – 0,94) was determined between common woody vegetation (trees and bushes) and the number of individual species of trees and bushes on the distance of their habitats in regulated stream slopes to the forest.