Dynamics in forest patterns during times of forest policy changes in Latvia

Abstract

In the context of forest management intensification, European countries are attempting to promote the sustainable management of forest landscapes. The aim of this study was to determine the structural dynamics of managed state forest landscapes in the context of changing forest policy. Four landscapes in the North Vidzeme Biosphere Reserve of northern Latvia were studied for the period between 1988 and 2011. The spatial patterns of clearcuts, regenerating stands and uncut stands were analysed using landscape metrics at the class level. For more comprehensive structural analysis, we additionally analysed the stand age structures and spatial pattern characteristics of over-mature stands and woodland key habitats (small voluntarily set-aside forest stands with high biodiversity values in Nordic and Baltic countries) that existed in 2011. The results indicated a substantial increase in the overall landscape structure complexity (measured by the number of patches, edge density and patch isolation at the class level) in three of the four analysed landscapes. At the class level, clearcut harvesting intensity increased after 2000, with the establishment of a new forest policy and management system in state forests combined with an abundance of timber available for felling. Significant increase in clearcut edge density and aggregation, with a corresponding decline of matrix connectivity, coincided with an increase in allowed felling volume by 4 million m3 for the period between 2009 and 2010 (increase in felling by about 60 % in state forests). Management reform and the introduction of a concentrated felling strategy in state forests also contributed to management intensification. Relatively higher WKH isolation, compared to that of over-mature stands, in all landscapes suggested that setting aside part of these stands could be a means of improving connectivity in the future. We suggest that the integration of landscape ecological principles, such as inclusion of ecological networks or retaining clusters of older stands, into Latvia’s forest management plans is needed and would contribute to more sustainable forest management.