The aim of this thesis is to evaluate the influence of edge effect on vegetation succession in black alder forests. 30 permanent study plots with size of 20×50 m were established with strips at several distances from the edge towards the center of the stand. Stands in study plots fell into three categories – with adjacent clearcut to S or SW created up to 10, 20-40 or more than 41 year ago. In all study plots living trees and dead wood was measured and vegetation was described by layers and the presence of rare epiphytic lichens was recorded.
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Library ResourceJournal Articles & BooksDecember, 2017Latvia
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Library ResourceLegislationFebruary, 1997Latvia
The Law provides rules on different types of protection zones, protected areas, and protection strips, which are specified in laws and other regulatory enactments. Its purpose is to determine the types of protection zones and the functions thereof; the basic principles for the establishment of protection zones; the procedures for the maintenance and control of the condition of protection zones; and restrictions of economic activity in protection zones.
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