Scholarly record
THE DYNAMICS OF VAGETATION DEVELOPMENT IN SHELTERWOOD STRIP CUTTING IN JELGAVA FOREST AREA, LATVIA
Abstract
The shelterwood strip cutting is the main felling technique, where the stand is cut in shelterwood the width of which does not exceed the average tree height of the stand. The information obtained in the study reflects how the characteristic forest vegetation develops, depending on the location and orientation of the object, as well as the cleaning type of forest residues. The development of vegetation shows which type is the most efficient and in which the vegetation develops the fastest. Two North-South (N-S) and East-West (E-W) oriented objects were selected in which the shelterwood strips have been cut. There are 60 circular sample plots with the radius of 1.78 m were formed, the area of the sample plot is 10 m2. The plots are arranged in three stripes in each of the objects, where the branches are burned, the branches are dispersed and the branches are decked on the road of the trailing. In each plot, an inventory of tree, shrub, herbaceous and moss layer species and their projective cover was carried out, using Braun-Blanquet method. It is important to find out which of the object?s orientation and type of cleaning of forest residues is the most effective and ensures the formation of stable plant communities. The aim of the research is to evaluate the development of forest vegetation in the shelterwood stripe cutting in Jelgava forest district. The process of vegetation development in the stripes depending on the object?s orientation, the type of cleaning of the forest residues has been analyzed, as well as the results have been compared with the data obtained in 1998 and 2008. In total, in the vegetation period of 2018, 40 species of trees, shrubs, herbaceous plants and mosses have been listed in both objects: 36 species have been found in the object oriented in the N-S direction and 25 species in the E-W direction, respectively. The significant presence of Scots pine in the stand in layers of trees and shrubs indicates its regeneration and the formation of uneven aged stand in the future, moreover, most plant species belong to the boreal coniferous forests. The projective coverage of vegetation layers interacts with each other. Some stages of succession have taken place in both objects and at present a forest stand with all vegetation layers has been formed. The most suitable environmental conditions for the faster development of Scots pine Pinus sylvestris L. are in the N-S oriented object because of the prevailing S, S-W winds around Jelgava ensure successful seed dispersal and forest stand regeneration processes.
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